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Inventory
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Topic
(12'707)
i
All areas designated as forest according to the NFI forest definition. The forest definition includes shrub forest. The target variable "forest area" is also used when classifying the total area as forest or non-forest.
area
(12)
i
All areas classified as shrub forest according to the NFI forest definition.
(36)
i
Area with clearly visible traces on the forest floor from timber harvesting vehicles such as tractors, forwarders and harvesters.
(36)
i
Forest area classified according to its functions (including "no special forest function"), as determined in the interview survey with the local forest services. A forest area can fulfil several forest functions at the same time, and can thus contribute to the forest area of several forest functions.
(7)
i
Forest area subject to the natural hazard processes rockfall, avalanche, hillslope debris flow/landslide and channel processes within the protection forest designated by the cantons according to the harmonised criteria of SilvaProtect-CH as of 2022. Since a protection forest can provide protection against various natural hazard processes at the same time, it can contribute to the forest area of several dfiferent processes. No natural hazard processes are shown for Canton Aargau because the protection forest there had not yet been designated in the reference year (2022).
(18)
i
Area of forest with recreational uses such as walking, hiking, jogging, cycling, biking, skiing and snowboarding, cross-country skiing, snowshoeing, horse-riding, camping, other activities, or no activities. Since different recreational activities may take place in a forest at the same time, this forest may contribute to the area of several recreation types.
(42)
i
Forest area in which specific measures for the conservation or promotion of biodiversity have been implemented since the last inventory. Only measures that have been explicitly subsidised as 'biodiversity' measures are taken into account. Since several biodiversity measures may be implemented in a forest area at the same time, this area may contribute to the total area of several different biodiversity measures.
(12)
i
Forest area closest to young forest plants with a particular type of damage. Young forest plants are trees and shrubs ≥10 cm in height and ≤11.9 cm in diameter at breast height (dbh). However, depending on the inventory, only trees ( NFI3, NFI5) or only trees and selected shrub species (NFI4) were recorded as the nearest young forest plant. Since a young forest plant may have several different types of damage, it can contribute to areas with several different damage types at the same time.
(32)
i
Ratio of the different damage events (e.g. wind, insects) which led to damage gaps. The ratio is determined on the basis of those damage gaps that account for at least 10% of the interpretation area (50 × 50 m) and on which, according to the information provided by the local forest services, only one damage event occurred. The target value thus allows comparisons of inventories from NFI3 onwards.
basal area
(615)
i
Sum of the stem cross-sectional areas at a height of 1.3 m (level for measuring diameter at breast height [dbh]) of living trees and shrubs (standing and lying) with a dbh ≥12 cm.
(96)
i
Sum of the stem cross-sectional areas at a height of 1.3 m (level for measuring diameter at breast height [dbh]) of all dead trees and shrubs (standing and lying) with a dbh ≥12 cm.
(16)
i
Sum of the stem cross-sectional areas at a height of 1.3 m (level for measuring diameter at breast height [dbh]) of all dead trees and shrubs (standing and lying) with a dbh ≥12 cm according to the method used in NFI1. In NFI1, dead trees were only included if their wood was still usable.
(150)
i
Sum of the stem cross-sectional areas at a height of 1.3 m (level for measuring diameter at breast height [dbh]) of all living and dead trees and shrubs (standing and lying) with a dbh ≥12 cm. The total basal area corresponds to the sum of the basal area and the deadwood basal area.
(12)
i
Sum of the stem cross-sectional areas at a height of 1.3 m (level for measuring diameter at breast height [dbh]) of all living and dead trees and shrubs (standing and lying) with a dbh ≥12 cm according to the method used in NFI1. In NFI1, dead trees were only included if their wood was still usable. The total basal area NFI1 corresponds to the sum of the basal area and the deadwood basal area NFI1.
biomass
(24)
i
Dry weight (mass) of standing and lying deadwood, determined with the help of the species- and decomposition-dependent wood densities of the following components: 1) stemwood, merchantable branchwood, branch brushwood and roots of standing and lying dead trees and shrubs with a diameter at breast height (dbh) ≥12 cm without stem breakage; 2) stemwood of the still standing stump, branch brushwood and roots of standing dead trees and shrubs ≥12 cm dbh with stem breakage and 3) LIS-deadwood, i.e. the lying deadwood with a diameter ≥7 cm (merchantable wood without merchantable wood pieces in heaps of branches), which cannot be assigned to a tree or shrub ≥12 cm dbh.
(24)
i
Dry weight (mass) of the so-called LIS deadwood, i.e. lying deadwood with a diameter ≥7 cm (merchantable wood; excluding merchantable wood pieces in heaps of branches), which cannot be assigned to a tree or shrub with a diameter at breast height (dbh) ≥12 cm. The mass is determined with the help of species- and decomposition-dependent wood densities.
(72)
i
Dry weight (mass) of living trees and shrubs with a diameter at breast height (dbh) ≥12 cm. The tree parts considered are: the roots, stemwood, branchwood and needles/leaves.
(36)
i
Dry weight (mass) of the aboveground parts of living trees and shrubs with a diameter at breast height (dbh) ≥12 cm. The tree parts included are: stemwood, branchwood and needles/leaves.
(24)
i
Dry weight (mass) of lying dead trees and shrubs with a diameter at breast height (dbh) ≥12 cm. This mass is determined with the help of species- and decomposition-dependent wood densities from the tree parts: roots, stemwood and, depending on the degree of decomposition, also the merchantable branchwood.
(24)
i
Dry weight (mass) of standing dead trees and shrubs with a diameter at breast height (dbh) ≥12 cm. This mass is determined with the help of species- and decomposition-dependent wood densities from the tree parts roots, stemwood and, depending on the degree of decomposition, also the merchantable branchwood.
(63)
i
Dry weight (mass) of the stumps ≥7 cm in diameter, i.e. the aboveground, woody parts of trees or shrubs below the felling cut or (in the case of natural decay) below the break surface. The maximum height of a stump is 1.3 m; if it is >1.3 m, it is treated as a snag. The mass is determined on the basis of species- and decomposition-dependent wood densities.
(32)
i
Dry weight (mass) of branches <7 cm with bark from living trees and shrubs with a diameter at breast height (dbh) ≥12 cm.
(32)
i
Dry weight (mass) of branches with a diameter ≥7 cm from living trees and shrubs with a diameter at breast height (dbh) ≥12 cm.
(32)
i
Dry weight (mass) of the needles and leaves of the living trees and shrubs with a diameter at breast height (dbh) ≥12 cm.
(40)
i
Dry weight (mass) of the belowground part (roots) of living trees and shrubs with a diameter at breast height (dbh) ≥12 cm. The dimensions of the roots are determined according to Zell and Wutzler.
(48)
i
Dry weight (mass) of the stemwood with bark of the living trees and shrubs with a diameter at breast height (dbh) ≥12 cm.
ecological indicators
(24)
i
Number of microhabitats on standing living trees and shrubs ≥12 cm in diameter at breast height (dbh). Microhabitats are defined as: fungal fruiting bodies; areas on the stem where moss, lichen or ivy covers more than 10%; woodpecker breeding cavity; shallow tree cavity; wide crack; bark pocket; fresh break; dendrotelm; canker or burr; buttress-root concavity; deep tree cavity; area of exposed bare wood larger than a hand; stag-headedness; resin flow; insect damage (foot of trunk /trunk/stem); >20% dead branches.
(27)
i
Number of standing living trees and shrubs ≥12 cm in diameter at breast height (dbh) on which a microhabitat was found. Since various microhabitats at a time may be found on the same tree, the tree may contribute to the number of stems (standing-living) of several different microhabitats. Microhabitats are defined as: fungal fruiting bodies; areas on the stem where moss, lichen or ivy covers more than 10%; woodpecker breeding cavity; shallow tree cavity; wide crack; bark pocket; fresh break; dendrotelm; canker or burr; buttress-root concavity; deep tree cavity; area of exposed bare wood larger than a hand; stag-headedness; resin flow; insect damage (foot of trunk /trunk/stem); >20% dead branches.
fellings
(26)
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Wood volume of the stem without bark and stump ≥7 cm in diameter (limit for merchantable wood) of all trees and shrubs with a diameter at breast height (dbh) ≥12 cm that were harvested between two inventories and were alive during the earlier inventory.
(404)
i
Stemwood volume of all trees and shrubs with a diameter at breast height (dbh) ≥12 cm with bark that were harvested between two inventories.
(372)
i
Stemwood volume of all trees and shrubs with a diameter at breast height (dbh) ≥12 cm with bark that were harvested, died or disappeared between two inventories.
(20)
i
Volume of stemwood with bark of all trees and shrubs ≥12 cm diameter at breast height (dbh) that were felled, died or disappeared between two inventories with the cause of death given.
(12)
i
Wood volume of branches ≥7cm in diameter with bark (limit for merchantable wood of all trees and shrubs with a diameter at breast height (dbh) ≥12 cm that were harvested between two inventories and were alive during the earlier inventory.
(12)
i
Wood volume of the stem without bark and stump and the branches with bark ≥7 cm in diameter (limit for merchantable wood) of all trees and shrubs with a diameter at breast height (dbh) ≥12 cm that were harvested between two inventories and were alive during the earlier inventory. The target variable "merchantable timber harvested" is an approximation of the amount of usable wood. It comes closest to the volume of timber harvested recorded in the Swiss Forest Statistics.
(156)
i
Volume of stemwood with bark of all trees and shrubs ≥12 cm diameter at breast height (dbh) that were removed from the forest because of damage that occurred between two inventories rather than due to silvicultural planning. The characteristic is derived at the sample plot level from the fellings of the tally trees and the proportion of sanitary/salvage fellings (according to information from the foresters).
(24)
i
Stemwood volume of all trees and shrubs with a diameter at breast height (dbh) ≥12 cm with bark that were not removed from the forest as part of silvicultural planning, but because they had been damaged by insects between two inventories. The variable is derived at the sample plot level from the harvested tally trees and the proportion of sanitary/salvage fellings (according to information provided by the foresters).
(24)
i
Stemwood volume of all trees and shrubs with a diameter at breast height (dbh) ≥12 cm with bark that were not removed from the forest as part of silvicultural planning, but because they had been damaged by wind between two inventories. The variable is derived at the sample plot level from the harvested tally trees and the proportion of sanitary/salvage fellings (according to information provided by the foresters).
forest edge
(27)
i
Length of the forest edge calculated on the basis of the forest boundary lines determined in the aerial photo.
(180)
i
Proportion of the forest edge with a certain characteristic (e.g. structural diversity, diversity of woody species or forest edge structure) in the total forest edge. The forest edge is the border or transition area between the vegetation form of forest and other elements of the landscape.
forest plots
(857)
i
Proportion of sample plots that meet the forest definition of NFI, i.e. are covered by "forest without shrub forest" or "shrub forest".
increment
(584)
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Increase in stemwood volume between two inventories of all surviving trees and shrubs with a diameter at breast height (dbh) ≥12 cm with bark, the stemwood volume of all ingrowing trees and shrubs with bark, and the modelled increase in the stemwood volume of the losses with bark during half the inventory period.
(388)
i
Increase in the stemwood volume between two inventories of all surviving trees and shrubs with a diameter at breast height (dbh) ≥12 cm with bark, the stemwood volume of all ingrowing trees and shrubs with bark, and the modelled increase in the stemwood volume of the losses with bark during half the inventory period minus the volume of mortality. The net increment thus corresponds to the increment (=gross increment) minus the volume of mortality.
length of forest roads
(2)
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Die gewichtete ZG-Nr. 336 berücksichtigt nicht alle im Datensatz vorhandenen Strassen-/Streckenabschnitte mit ihrer jeweils erfassten vollen Länge. Je nach Lage können Strassen-/Streckenabschnitte z.B. im freien Feld weggelassen, oder nur zu 50% ihrer Länge berücksichtigt werden. Zu den LFI4-Waldstrassen zählen nur die zum Zeitpunkt der LFI4-Erhebung explizit verfügbaren Strassen-/Streckenabschnitte. Die in der LFA.WASTRA-Tabellenbeschreibung genannten Bedingungen müssen bei der Verwendung der ZG eingehalten werden.
(3)
i
Die gewichtete ZG-Nr. 345 berücksichtigt die vorhandenen Strassen-/Streckenabschnitte, die im Schutzwaldperimeter und gleichzeitig innerhalb des Waldes der LFI-Waldmaske liegen. Der Schutzwaldperimeter wurde vom BAFU als GIS-Datei zur Verfügung gestellt (Stand 2013).
Die Strassen-/Streckenabschnitte werden nur teilweise mit ihrer jeweils erfassten vollen Länge berücksichtigt, sondern sind gewichtet. Je nach Lage können Strassen-/Streckenabschnitte z.B. im freien Feld weggelassen, oder nur zu 50% ihrer Länge berücksichtigt werden. Die verwendete flächendeckende Walddefinition orientiert sich an der Waldmaske auf der Basis des Vegetationshöhenmodells und ist nicht identisch mit den Waldkriterien und Punktentscheiden des LFI und/oder mit den Waldkriterien des Schutzwaldes. Zu den LFI4-Waldstrassen im Schutzwald zählen nur die zum Zeitpunkt der LFI4-Erhebung explizit verfügbaren Strassen-/Streckenabschnitte.
Die in der LFA.WASTRA-Tabellenbeschreibung genannten Bedingungen müssen bei der Verwendung der ZG eingehalten werden.
mortality
(372)
i
Stemwood volume of all trees and shrubs with a diameter at breast height (dbh) ≥12 cm with bark that were harvested, died or disappeared between two inventories.
(20)
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Volume of stemwood with bark of all trees and shrubs ≥12 cm diameter at breast height (dbh) that were felled, died or disappeared between two inventories with the cause of death given.
(304)
i
Stemwood volume of all trees and shrubs with a diameter at breast height (dbh) ≥12 cm with bark that died naturally between two inventories (e.g. due to windthrow or insects) or disappeared (e.g. due to avalanches), but that were not harvested. Mortality is the sum of natural losses and the remaining mortality.
number of stems
(184)
i
Number of stems of dead trees and shrubs (standing and lying) with a diameter at breast height (dbh) ≥12 cm.
(12)
i
Number of stems of dead trees and shrubs (standing and lying) with a diameter at breast height (dbh) ≥12 cm recorded according to the NFI1 method. In NFI1, dead trees were only included if their wood was still usable. In addition, lying but still green trees were classified as deadwood.
(1'993)
i
Number of stems of living trees and shrubs (standing and lying) with a diameter at breast height (dbh) ≥12 cm.
(24)
i
Number of living conifers and conifers ≥10 cm in height and ≤11.9 cm in diameter at breast height (dbh).
(72)
i
Number of stems of conifers and broadleaves 10 to 129 cm in height on which browsing on the shoot from the previous year was detected. Since a different method was used for assessing browsing traces in NFI2, the browsing intensity was overestimated in comparison with in the inventories from NFI4 on. Thus, only increases in browsing intensity can be clearly determined in comparisons with NFI2. For a reliable estimate, at least 30 individuals per estimated value (table cell) should have been assessed for browsing. Therefore, the corresponding tables with the target variable "Number of trees assessed for browsing (no extrapolation)" should also be consulted.
(48)
i
Actual number of conifers and broadleaves assessed for browsing during the field survey (no extrapolation).
(52)
i
Measure of the density of a stocking calculated from the number of stems per hectare (in NFI trees and shrubs with a diameter at breast height [dbh] ≥12 cm) and the mean diameter. With a callipering threshold of 0 cm, the SDI is largely independent of the site quality, tree species composition and stand age.
(1'442)
i
Number of stems of all living and dead trees and shrubs (standing and lying) with a diameter at breast height (dbh) ≥12 cm. The total number of stems is the sum of the number of stems and the number of deadwood stems.
(102)
i
Number of stems of all living and dead trees and shrubs (standing and lying) with a diameter at breast height (dbh) ≥12 cm according to the method used in NFI1. In NFI1, dead trees were only included if their wood was still usable. The total number of stems NFI1 is the sum of the number of stems and the number of deadwood stems NFI1.
(127)
i
Number of living and dead trees and shrubs (standing and lying) ≥12 cm diameter at breast heigth (dbh) with damage. Only the two most important forms of damage to a tree are recorded. Since a tree may be damaged in different ways, it may contribute more than once to the total number of stems with the two most important forms of damage.
volume
(144)
i
Stemwood volume of standing dead trees and shrubs with a diameter at breast height (dbh) ≥12 cm less the volume of broken stem pieces, plus the volume of lying deadwood ≥7 cm in diameter (merchantable wood) without merchantable pieces in heaps of branches.
(200)
i
Volume of lying deadwood ≥7 cm in diameter (merchantable wood) without merchantable wood pieces in heaps of branches.
(84)
i
Volume of lying deadwood ≥7 cm in diameter (merchantable wood), including merchantable pieces of wood in piles of branches.
(63)
i
Volume of stumps ≥7 cm in diameter, i.e. the aboveground, woody parts of trees or shrubs below the felling cut or (in the case of natural decay) below the break surface. The maximum height of a stump is 1.3 m; if it is >1.3 m, it is treated as a snag.
(3'117)
i
Stemwood volume of living trees and shrubs (standing and lying) with a diameter at breast height (dbh) ≥12 cm with bark.
(1'318)
i
Stemwood volume of all living and dead trees and shrubs (standing and lying) with a diameter at breast height (dbh) ≥12 cm with bark. The total wood volume is the sum of the growing stock and deadwood volumes.
(72)
i
Stemwood volume of all living and dead trees and shrubs (standing and lying) with a diameter at breast height (dbh) ≥12 cm with bark according to the method used in NFI1. In NFI1, dead trees were only included if their wood was still usable.
(174)
i
Wood volume of the stem without bark or stump ≥7 cm in diameter (limit for merchantable wood) of all trees and shrubs with a diameter at breast height (dbh) ≥12 cm, based on the stem-form functions according to Kaufmann (2001). The definition of the assortments is based on the 2010 edition of the Swiss trading customs for raw timber (HG 2010).
(982)
i
Volume of stemwood of all dead trees and shrubs (standing and lying) with a diameter at breast height (dbh) ≥12 cm with bark.
(52)
i
Stemwood volume of all dead trees and shrubs (standing and lying) with a diameter at breast height (dbh) ≥12 cm with bark recorded according to the NFI1 method. In NFI1, dead trees were only included if their wood was still usable. In addition, lying but still green trees were classified as deadwood.
woody species
(48)
i
Measure for the ecological assessment of forest stands, derived from the number of woody species with a diameter at breast height (dbh) ≥12 cm and the occurrence of woody species of special ecological significance (willows, birches, alders, native poplars, oaks, chestnut, cherry, wild fruit and Sorbus species) in the upper layer.
(12)
i
Number of tree and shrub species with a diameter at breast height (dbh) ≥12 cm within the 200 m² circle on the sample plot.
(40)
i
Number of species of trees and shrubs that occur within the 200 m² circle on the sample plot with at least one living individual ≥40 cm high.
show more...
Classification
(10)
i
Horizontal distance that the timber travels on a road with limited truck drivability to the point of sale (timber yard or railway station) in four classes. Restricted truck access means that the road cannot be used by trucks with fewer than 4 axles due to permanent bottlenecks or places with a load capacity of less than 28 tonnes. Reference: Forest Service Survey (MID 3060: Vortransportlinie)
(135)
i
Altitude above sea level in classes of 200 m. Reference: Digital height model DHM 25 from Swisstopo
(431)
i
Altitude above sea level in classes of 400 m. Reference: Digital height model DHM 25 from Swisstopo
(48)
i
Altitudinal vegetation belts in the system used in the guidelines for monitoring the sustainability and performance of protection forests (NaiS; Frehner et al. 2005) – in ten classes, whereby the classes «hyperinsubric», «colline» and «colline with beech» and «lower and upper montane» only occur in the Southern Alps (S), the classes «submontane», «lower montane», «upper montane» only in the Northern Alps (N) and the classes «high montane», «subalpine» and «upper subalpine» on both sides of the Alps. The information is based on the altitudinal vegetation belts determined by experts (accessible forest sample plots of NFI4 on the 1.4-km network; Arge Frehner et al. 2020), as well as on the altitudinal vegetation belts modelled for the period 1981-2010 (other sample plots; Zischg et al. 2021).
(169)
i
Altitudinal vegetation belts in the system used in the guidelines for monitoring the sustainability and performance of protection forests (NaiS; Frehner et al. 2005), reduced to three classes. The variable represents a simplification of the NaiS altititudinal vegetation belts in six classes (NAISHSTKOMB6KL) in which the class «hyperinsubric and colline» is mearged with «submontane» to form the class «hyperinsubric, colline, submontane», the class «lower and upper montane» with «high montane» to form the class «montane» and the class «subalpine» with «upper subalpine» to form the class «subalpine». The information is based on the altitudinal vegetation belts determined by experts (accessible forest sample plots of NFI4 on the 1.4-km network; Arge Frehner et al. 2020), as well as on the altitudinal vegetation belts modelled for the period 1981-2010 (other sample plots; Zischg et al. 2021).
(1'604)
i
Altitudinal vegetation belts in the system used in the guidelines for monitoring the sustainability and performance of protection forests (NaiS; Frehner et al. 2005), reduced to six classes. The variable represents a simplification of the NaiS altitudinal vegetation belts with ten classes (NAISHSTKOMB) in which the classes «hyperinsubric» and «colline» are merged with «colline with beech» to form the class «hyperinsubric and colline» and the class «lower montane» with «upper montane» and «lower/upper montane» to form the class «lower and upper montane». The information is based on the altitudinal vegetation belts determined by experts (accessible forest sample plots of NFI4 on the 1.4-km network; Arge Frehner et al. 2020), as well as on the altitudinal vegetation belts modelled for the period 1981-2010 (other sample plots; Zischg et al. 2021).
(152)
i
Aspect, classified into the following five classes: North, East, South, West and indeterminate. «Indeterminate» means that the slope is ≤10%. Reference: Field Survey (MID 191: Azimut der Exposition)
(48)
i
Aspect, classified into the following nine classes: North, North-East, East, South-East, South, South-West, West, North-West and indeterminate. «Indeterminate» means that the slope is ≤10%. Reference: Field Survey (MID 191: Azimut der Exposition)
(180)
i
Basal area of standing living trees and shrubs ≥12 cm in diameter at breast height (dbh) per hectare – in four classes. Reference: Field Survey (MID 60: Brusthöhendurchmesser, MID 62: Umfang)
(21)
i
Type of subsidised measure implemented since the last Inventory as part of the biodiversity promotion programme. Reference: Forest Service Survey (MID 2016: Biodiversitätsmassnahmen)
(140)
i
Ecological value of the forest as a habitat for animals and plants – in three classes. Its value as a biotope is based on the three indicators «naturalness of the proportion of conifers», «diversity of woody species» and «structural diversity».
(24)
i
Type of certificate: FSC and/or PEFC (NFI4, NFI5) or FSC and/or Q (PEFC) (NFI3). Reference: Forest Service Survey (MID 602: Zertifizierungs-Label)
(420)
i
Measure of inter-tree crowding of the tree crowns in a stand. Reference: Field Survey (MID 266: Schlussgrad)
(24)
i
Size of the adjacent areas on which the trees were so severely damaged during an event (e.g. storm, drought, insect or fungal infestation, or timber harvest) that they died immediately or are most likely to soon die – in five classes..Reference: Field Survey (MID 996: Fläche des Schadens am Probeflächenzentrum), together with Forest Service Survey (MID 600: Art der Schadenflächen)
(567)
i
Proportion of the ground area covered by tree crowns according to the aerial photo interpretation – in five 20-percent classes. The percentage is calculated using the 25 grid points on the interpretation area (50 × 50 m). Reference: aerial photo interpretation
(288)
i
Proportion of the ground area that is covered by established regeneration, i.e. by living coniferous and broadleaved trees ≥1.3 m in height and 11.9 cm in diameter at breast height (dbh). Reference: Field Survey (MID 273: Deckungsgrad der gesicherten Verjüngung)
(20)
i
Proportion of ground area covered by ferns, grasses, herbs, Rubus species, (tall) herbaceous perennials and dwarf shrubs (e.g. vaccinia, Alpenrose or juniper). Reference: Field Survey (MID 278: Bodenvegetations-Deckungsgrad).
(20)
i
Proportion of the ground area covered by trees and shrubs with a height of 0.5-3.0 m and by branches of taller individuals of the same species in the same area. Reference: Field Survey (MID 277: Strauchschicht-Deckungsgrad)
(20)
i
Proportion of the ground area covered with berry bushes (blackberry, raspberry, blueberry, cowberry, bog bilberry, and cranberry). Reference: Field Survey (MID 279: Beerensträucher-Deckungsgrad)
(110)
i
Degree of damage to forest stands in six classes, derived from the mean degree of damage to trees and shrubs ≥12 cm in diameter at breast height (dbh) weighted with the basal area. Reference: Field Survey (MID 1027: Baumschadenart, MID 1018: Baumzustand)
(576)
i
Proportions of conifers and broadleaves making up the stand structure, classified according to their proportional basal areas into four classes: pure conifer forest: 91-100 % conifers, mixed conifer forest: 51-90 % conifers, mixed broadleaved forest: 11-50 % conifers and pure broadleaved forest: 0-10 % conifers. Reference: Field Survey (MID 265: Mischungsgrad)
(208)
i
Proportion of the area covered by regeneration, i.e. broadleaves and conifers ≥10 cm in height and ≤11.9 cm in diameter at breast height (dbh) - in seven classes. The variable has been in use since NFI3 (2004-2006). For comparisons going back to NFI2 (1993-1995), the variable «degree of regeneration cover (6 classes)» can be used. Reference: Field Survey (MID 270: Verjüngungs-Deckungsgrad)
(220)
i
Stage of stand development, defined by the dominant diameter at breast height (dbhdom = dbh of the 100 largest [thickest] trees per hectare). Young growth/thicket: dbhdom <12 cm, pole timber: dbhdom 12-30 cm, young timber: dbhdom 31-40 cm, medium timber : dbhdom 41-50 cm, old timber: dbhdom >50 cm, mixed: trees of different development stages, no development stage predominant or groups of different development stages covering < 500 m². Reference: Field Survey (MID 261: Entwicklungsstufe)
(20)
i
Ecological value of the forest stand according to the number of woody species present, as well as the presence of woody species of special ecological importance (willows, birches, alders, native poplars, native oaks, chestnut, cherry tree, Malus spp., Pyrus spp., Sorbus spp. and Scots pine) in the upper layer – in three classes. Reference: Field Survey (MID 50: Baumart, MID 65: Schicht)
(16)
i
Indication of whether alien woody species (tree or shrub neophytes) ≥12 cm in diameter at breast height (dbh) dominate the growing stock, i.e. account for at least 50% of the growing stock – in two classes. Reference: Field Survey (MID 50: Baumart, MID 1018: Baumzustand, MID 60: Brusthöhendurchmesser, MID 62: Umfang)
(40)
i
Indication as to whether invasive or non-invasive alien woody species («tree or shrub neophytes») ≥12 cm in diameter at breast height (dbh) dominate the growing stock, i.e. account for at least 50% of the growing stock – in three classes. The classification as «invasive» is based on the 2022 publication «Invasive alien species in Switzerland» of the Federal Office for the Environment (FOEN) (UW-2220-E). Reference: Field Survey (MID 50: Baumart, MID 1018: Baumzustand, MID 60: Brusthöhendurchmesser, MID 62: Umfang)
(24)
i
Indication as to whether introduced woody species (tree- or shrub-like neophytes) ≥12 cm in diameter at breast height (dbh) dominate the growing stock, i.e. account for at least 50% of the growing stock, classified into the three classes: «not dominated by introduced species», «dominated by introduced species other than black locust», «dominated by introduced, invasive black locust». Black locust is the only invasive introduced species that has been recorded separately in all NFI inventories to date. The classification as «invasive» corresponds to the publication «Alien species in Switzerland» of the Federal Office for the Environment (FOEN) from 2022 (UW-2220-E). Reference: Field Survey (MID 50: Baumart, MID 1018: Baumzustand, MID 60: Brusthöhendurchmesser, MID 62: Umfang)
(72)
i
Mean age of the 100 largest standing living trees and shrubs ≥12 cm in diameter at breast height (dbh) per hectare – in five classes. Reference: Field Survey (MID 826: Baumalter)
(24)
i
Diameter at breast height (dbh) of the 100 largest (thickest) standing living trees and shrubs ≥12 cm dbh per hectare – in eight classes. Reference: Field Survey (MID 60: Brusthöhendurchmesser, MID 62: Umfang)
(72)
i
Mean diameter at breast height (dbh) of the 100 largest standing living trees ≥12 cm in diameter at breast height (dbh) per hectare – in five classes. Reference: Field Survey (MID 60: Brusthöhendurchmesser, MID 62: Umfang)
(84)
i
Location inside or outside the catchment area of a spring whose water is fed either directly and unfiltered into the drinking-water supply, or is used at least temporarily or partially as drinking water for the public. Reference: Forest Service Survey (MID 603: Wald im Einzugsgebiet von gefassten Trinkwasserquellen)
(10)
i
Distance - measured horizontally - that the timber is transported from the felling site to a road that is at least 2.50 m wide and dimensioned for an axle load of at least 10 tonnes - in four classes. Any hauling on a road does not count to the extraction distance. Reference: Forest Service Survey (MID 3000: Rückelinie)
(96)
i
Combination of the 18 groups of NaiS site types, each with a similar objective for the main tree species (NAISGGROB20), into 10 large associations known as «forest formations». *As the characterisation of the site types in the NaiS-NFI project is on a small scale, it is possible that non-forest site types such as meadow, pasture and rock may be present in sample plots that are classified as «forest» in NFI. Similarly, «forest without shrub forest“ may also contain «shrub forest» site types.
(36)
i
Forest functions of considerable local importance according to forest plans or an assessment by the local forest service. It's possible for there to be several forest functions of considerable local importance at the same time. Reference: Forest Service Survey (MID 327: Spezielle Waldfunktionen)
(102)
i
Presence of the forest function 'agricultural use' according to forest plans or an assessment by the local forest service. The forest function 'agricultural use' generally includes wooded pastures and nut orchards. Reference: Forest Service Survey (MID 327: Spezielle Waldfunktionen)
(6)
i
Presence of the forest function «carbon sink» according to forest plans or an assessment by the local forest service. Reference: Forest Service Survey (MID 327: Spezielle Waldfunktionen)
(102)
i
Presence of the forest function 'drinking-water protection' according to forest plans or an assessment by the local forest service. The forest function «drinking-water protection» generally includes groundwater protection zones and drinking-water catchment areas. Reference: Forest Service Survey (MID 327: Spezielle Waldfunktionen)
(102)
i
Presence of the forest function 'game protection' according to forest plans or an assessment by the local forest service. As a rule, the forest function 'game protection' includes seasonal grazing areas and game reserves. Reference: Forest Service Survey (MID 327: Spezielle Waldfunktionen)
(102)
i
Presence of the forest function 'landscape protection' according to forest plans or an assessment by the local forest service. Reference: Forest Service Survey (MID 327: Spezielle Waldfunktionen)
(102)
i
Presence of the forest function 'military' according to forest plans or an assessment by the local forest service. Reference: Forest Service Survey (MID 327: Spezielle Waldfunktionen)
(102)
i
Presence of the forest function 'nature conservation' according to forest plans or an assessment by the local forest service. Reference: Forest Service Survey (MID 327: Spezielle Waldfunktionen)
(82)
i
Presence of the forest function «protection against natural hazards» according to forest plans or an assessment by the local forest service. The term «natural hazards» refers to avalanches, rockfall, landslides, landslides and channel processes. Reference: Forest Service Survey (MID 327: Spezielle Waldfunktionen)
(102)
i
Presence of the forest function 'recreation' according to forest plans or an assessment by the local forest service. Reference: Forest Service Survey (MID 327: Spezielle Waldfunktionen)
(102)
i
Presence of the forest function 'timber production' according to forest plans or an assessment by the local forest service. Reference: Forest Service Survey (MID 327: Spezielle Waldfunktionen)
(102)
i
Presence of the forest function 'windbreak' according to forest plans or an assessment by the local forest service. The forest function 'windbreak' generally includes the forests or forest strips that protect agricultural land against wind. Reference: Forest Service Survey (MID 327: Spezielle Waldfunktionen)
(96)
i
Intensity of forest management, classified in three classes according to site quality and the time of the last treatment. Reference: Forest Service Survey (MID 607: Anzahl Jahre seit dem letzten Eingriff); modelled site quality (total growth performance according to Keller 1978)
(22)
i
Indication as to whether forest planning documents exist at the local level (operational plan, silvicultural project, etc.) and/or at the cantonal level (forest development plan or regional/cantonal forest plan). These documents provide the basis for the forest manager to make silvicultural or operational decisions, irrespective of the year they were produced. Reference: Forest Service Survey (MID 2028: lokale forstliche Planungswerke, MID 803: Stand der Waldentwicklungspläne WEP)
(528)
i
Classification of forests into 12 classes («types») according to their development, structure and management. Unlike in the 17-class forest-type classification, in this 12-class classification all development stages (from young growth to timber) are subsumed in the class «uniform high forest». Reference: Field Survey (MID 255: Nutzungskategorie, MID 257: Waldtyp nach Aufnahmeanleitung LFI, MID 260: Waldform, MID 267: Bestandesstruktur, MID 261: Entwicklungsstufe)
(48)
i
Classification of forests according to their establishment, structure and management into 17 classes («types»). In contrast to the forest typology with 12 classes, the forest typology with 17 classes defines each development stage (young growth to timber) as an individual class. Reference: Field Survey (MID 255: Nutzungskategorie, MID 257: Waldtyp nach Aufnahmeanleitung LFI, MID 260: Waldform, MID 267: Bestandesstruktur, MID 261: Entwicklungsstufe)
(1'113)
i
Classification of the forest according to the forest decision and accessibility into the three classes «accessible forest without shrub forest», «inaccessible forest without shrub forest» and «shrub forest».
(672)
i
Type of forest in two classes: «forest without shrub forest» or «shrub forest». Reference: Field Survey (MID 816) or - if the forest is inaccessible – aerial photo interpretation
(125)
i
Land cover, classified as one of three categories: 'forest without shrub forest', 'shrub forest' and 'non-forest', based on the NFI forest definition. Reference: Field Survey (MID 816), or if inaccessible, aerial photo interpretation.
(70)
i
Land cover classified into the two classes: «forest» (i.e. forest without shrub forest or shrub forest) and «non-forest» according to the forest definition of the NFI. Reference: Field Survey or, in if inaccessible – aerial photo interpretation
(48)
i
Zones around groundwater wells and groundwater recharging facilities that are designated by the canton as in the public interest for protecting drinking water. How strict the property restrictions and/or management requirements are depends on the protection zone,. The variable reflects the protection zone categories applicable since 2016 in accordance with Art. 121 of the Waters Protection Ordinance (SR 814.201) and the status of designation by the cantons on 8 July 2022 (download of data from geodienste.ch).
(20)
i
Habitat quality assessed according to the types of deadwood present. It is considered «high» if the three deadwood types «snagss», «branch and wood piles» and «stumps and lying deadwood» are present on the interpretation area, «moderate» if two types are present, and «low» if none or only one type is present.
(30)
i
Indication as to whether the timber harvesting (felling, processing, extraction and hauling) is carried out wholly or in part by the forest enterprise itself or by a contractor. If an intervention has been carried out since the last Inventory, the information is based on the actual type of operation; if no intervention has been carried out, it is based on the type of operation that the district forester thinks would have been carried out at the time of the current Inventory. Reference: Forest Service Survey (MID 351: Ausführung der Holzernte)
(689)
i
Areas in higher and lower altitude zones classified according to the system used for altitudinal vegetation belts in the guidelines for monitoring the sustainability and performance of protection forests (NaiS; Frehner et al. 2005). The boundary between the higher and lower altitudes runs between the «upper montane» and «lower montane» levels on the Northern Alps and between the «high montane» and «upper/lower montane» levels to the Southern Alps. The information is based on the altitudinal vegetation belts determined by experts (accessible forest sample plots of NFI4 on the 1.4-km network; Arge Frehner et al. 2020), as well as on the altitudinal vegetation belts modelled for the period 1981-2010 (other sample plots; Zischg et al. 2021).
(168)
i
Located in/outside a groundwater protection zone. The cantons demarcate groundwater protection zones around groundwater wells and groundwater recharging facilities to protect drinking water where this is in the public interest. The indicator variable combines the various protection zone categories in force since 2016 in accordance with Art. 121 of the Waters Protection Ordinance (SR 814.201) into one class. Data status: 8 July 2022 (download from geodienste.ch).
(38)
i
Machines or tools used for felling and processing the trees. If an intervention has taken place since the last Inventory, the data is based on the means actually used. If no intervention has taken place, it is based on the means that would have been used in the case of an intervention at the time of the current Inventory, according to the district forester's assessment. Reference: Forest Service Survey (MID 352: Art der Holzernte)
(7)
i
Natural hazard processes that can occur in forests designated as protection forests by the cantons according to the harmonised criteria of SilvaProtect. Reference: Losey & Wehrli (2013)
(168)
i
Correspondence between the actual proportion of conifers in a stand and the postulated natural proportion of conifers in the corresponding potential natural vegetation (PNV). Reference: NaiS site types, aggregated into groups with similar mixing and regeneration objectives («Gfein») according to the NaiS-NFI project (Arge Frehner et al. 2020) for the PNV; classification of the proportion of conifers according to the Kienast method; Field Survey (MID 50: Baumart, MID 60: Brusthöhendurchmesser, MID 62: Umfang)
(48)
i
Number of natural hazard processes that can occur simultaneously in forest designated «protection forest» by the cantons (as of 2022) according to the harmonised criteria of SilvaProtect-CH (as of 2022). The following four natural hazard processes can be considered: rockfall, avalanches, hillslope debris flows/landslides, channel processes. Reference: GIS data from the FOEN, 2022
(180)
i
Number of standing living trees and shrubs ≥24 cm in diameter at breast height (dbh) – in classes of 100. Reference: Field Survey (MID 60: Brusthöhendurchmesser, MID 62: Umfang, MID 1018: Baumzustand)
(180)
i
Number of standing living trees and shrubs ≥36 cm in diameter at breast height (dbh) – in classes of 100. Reference: Field Survey (MID 60: Brusthöhendurchmesser, MID 62: Umfang, MID 1018: Baumzustand)
(180)
i
Number of standing living trees and shrubs ≥12 cm in diameter at breast height (dbh) per hectare – in classes of 100. Reference: Field Survey (MID 60: Brusthöhendurchmesser, MID 62: Umfang, MID 1018: Baumzustand)
(112)
i
Number of tree and shrub species in the upper stand layer – in six classes. The information refers to the relevant stand on the interpretation area (50 × 50 m) and only takes into account species with a cover ≥5%. Reference: Field Survey (MID 242: Baumart in der Oberschicht)
(96)
i
Classification of forest stands according to the dominant diameter at breast height (dbhdom), i.e. the 100 largest (thickest) standing living trees per hectare, as: «old timber stand» (dbhdom >50 cm) or «not old timber stand». Reference: Field Survey (MID 60: Brusthöhendurchmesser, MID 62: Umfang)
(438)
i
Forest ownership, classified according to the two categories: 'public' and 'private'. Reference: Forest Service Survey (MID 365: Eigentum)
(9)
i
Forest ownership at the time of NFI5, classified into the two classes: «public» and «private». The attribute is used in analyses of change to ensure that changes in ownership do not influence the results. Reference: Forest Service Survey (MID 365: Eigentum)
(132)
i
Ownership of the forest, categorised according to the 7 types 'federal government', 'canton', 'municipality', 'citizens' community', 'corporation', 'individual private ownership' and 'company'. Reference: Forest Service Survey (MID 365: Eigentum)
(80)
i
Sample plots with/without traces of grazing by livestock pasturing in the relevant stand on the interpretation area (50 × 50 m), as well as intensity and recency of pasturing based on the occurrence and freshness of pasturing signs, especially tracks and droppings. Reference: Field Survey (MID 205: Beweidungsintensität)
(12)
i
Level of potential demand for local recreation, classified into five classes according to a model that estimates the number of permanently occupied and temporarily occupied/unoccupied dwellings within a radius of two kilometres. The variable is only available for NFI2 and NFI3.
(132)
i
Tree species group (conifers or broadleaves) with the larger basal area. For the calculation, the standing living trees and shrubs ≥12 cm in diameter at breast height (dbh) were taken into account. Reference: Field Survey (MID 1018: Baumzustand, MID 50: Baumart, MID 60: Brusthöhendurchmesser, MID 62: Umfang)
(186)
i
Main tree species with the largest basal area. For the calculation, the standing living trees and shrubs ≥12 cm in diameter at breast height (dbh) were taken into account. Reference: Field Survey (MID 1018: Baumzustand, MID 50: Baumart, MID 60: Brusthöhendurchmesser, MID 62: Umfang)
(24)
i
Type of the most important forest function relevant for managing the forest according to forest plans or an assessment by the local forest service during NFI4 (2009-2017). Reference: Forest Service Survey (MID 911: Vorrangfunktion 2)
(54)
i
Type of the most important forest function relevant for management according to forest plans or an assessment by the local forest service during NFI5 (2018-2026). Reference: Forest Service Survey (MID 911: Vorrangfunktion 2)
(31)
i
Presence of the primary function «nature and landscape conservation», classified into the four classes: «landscape protection», «nature conservation», «game protection» or «other» according to forest plans or an assessment by the local forest service during NFI5 (2018-2026). Reference: Forest Service Survey (MID 911: Vorrangfunktion 2)
(141)
i
Presence of the primary function: «nature conservation» according to forest plans or an assessment by the local forest service during NFI5 (2018-2026). Reference: Forest Service Survey (MID 911: Vorrangfunktion 2)
(60)
i
Proportion of conifers in the basal area of standing living trees and shrubs ≥12 cm in diameter at breast height (dbh) – in four classes. Reference: Field Survey (MID 60: Brusthöhendurchmesser, MID 62: Umfang)
(230)
i
Percentage of sanitary/salvage fellings in total fellings - in three classes. Reference: Forest Service Survey (MID 344: Anteil Zwangsnutzung)
(687)
i
Area in/outside a forest that provides protection against avalanches which the cantons designated «protection forest» according to the harmonised criteria of SilvaProtect-CH in 2022. Reference: GIS data from FOEN, 2024
(687)
i
Area in/outside a forest that provides protection against channel processes which the cantons designated «protection forest» according to the harmonised criteria of SilvaProtect-CH in 2022. Reference: GIS data from FOEN, 2022
(687)
i
Area in/outside a forest that provides protection against hillslope debris flows/landslides which the cantons designated «protection forest» according to the harmonised criteria of SilvaProtect-CH in 2022. Reference: GIS data from FOEN, 2023
(687)
i
Area in/outside a forest that provides protection against rockfall processes which the cantons designated «protection forest» according to the harmonised criteria of SilvaProtect-CH in 2022. Reference: GIS data from FOEN, 2025
(723)
i
Area inside/outside the protection forest that the cantons had designated in 2022 according to the harmonised criteria of SilvaProtect-CH (Losey & Wehrli 2013). In 2022, Canton Aargau had not yet designated its protection forest. Reference: GIS data from FOEN, 2022
(180)
i
Main reason for sanitary/salvage felling. Reference: Forest Service Survey (MID 345: Ursache der Zwangsnutzung)
(410)
i
Proportion of the area covered by regeneration, i.e. broadleaved and coniferous trees ≥10 cm in height and ≤11.9 cm in diameter at breast height (dbh), in six classes. The feature is available as of NFI2 (1993-1995). Reference: Field Survey (MID 270: Verjüngungs-Deckungsgrad)
(345)
i
Type of forest reserve («natural forest reserve», «special forest reserve“ or «other forest»), based on the forest reserves as designated by the cantons (as of 2023) and the forest/non-forest decision of the respective Inventory. Reference: GIS data from FOEN, 2023, and Field Survey (MID 816) or – if the forest is inaccessible – aerial photo interpretation
(20)
i
Presence of non-forestry buildings and facilities, such as railway lines, main roads, power- and pipelines or residential areas, which potentially impede logging, i.e. tree felling and processing. Reference: Field Survey (MID 207: Einschränkungen für die Holzhauerei)
(30)
i
Indication as to whether a silvicultural treatment took place since the last inventory. Reference: Forest Service Survey (MID 611: Art alle Eingriffe seit Referenzdatum)
(308)
i
Production capacity of the site in kilograms per hectare and year based on the total mean increment (TMI) according to Keller (1978) - in four classes. Low: TMI ≤1500 kg/(ha/year), moderate: TMI 1501-3000 kg/(ha/year), good: TMI 3001-4500 kg/(ha/year), very good: TMI >4500 kg/(ha/year).
(114)
i
Forest area under the same management – in eight classes. Several forest owners form a management unit («enterprise») if they have joined forces to manage their forests permanently (and not just for one logging operation). Reference: Forest Service Survey (MID 410: Grösse der Bewirtschaftungseinheit)
(560)
i
Slope in classes of 20%. Reference: Digital height model DHM 25 from Swisstopo
(48)
i
Slope in classes of 40%. Reference: Digital height model DHM 25 from Swisstopo
(102)
i
Presence of a forest function that is locally very important according to forest plans or an assessment by the local forest service – in two classes (present/absent). Forest functions include e.g. timber production, protection against natural hazards, nature conservation and drinking water protection. Reference: Forest Service Survey (MID 327: Spezielle Waldfunktionen)
(24)
i
Age of the stand – in classes of 20 years. Reference: Field Survey (MID 264: Bestandesalter)
(306)
i
Age of the stand – in classes of 40 years. Reference: Field Survey (MID 264: Bestandesalter)
(132)
i
Density of a stand – in four classes. The Stand Density Index (SDI) is calculated on the basis of the number of stems per hectare of trees and shrubs ≥12 cm in diameter at breast height (dbh) and the mean diameter. Reference: Field Survey (MID 60: Brusthöhendurchmesser, MID 62: Umfang, MID 1018: Baumzustand)
(60)
i
Stand in which the existing regeneration is very important because it is most likely to form the future main stand. In NFI, this is understood to mean the development stage young growth/thicket, regeneration under shelterwood and selection-type high forest. Reference: Field Survey (MID 261: Entwicklungsstufe, MID 433: Waldbauliche Beurteilung, MID 267: Bestandesstruktur); Forstdienstbefragung (MID 611: Art alle Eingriffe seit Referenzdatum)
(16)
i
Classification of tree collectives into three classes in order to distinguish small collectives (group [500-900 m²] and groves [1000-4900 m²]) from stands in the sense of silvicultural theory (≥5000 m²). Reference: Field Survey (MID 259: Bestandesgrösse)
(858)
i
Mechanical resistence of a stand to abiotic and biotic stresses within the next 10 to 20 years – in three classes. Reference: Field Survey (MID 310: Gesamtstabilität)
(384)
i
Vertical structure (stratification) of a stand, defined on the basis of the degrees of cover of the upper, middle and lower layers. Reference: Field Survey (MID 267: Bestandesstruktur)
(69)
i
Indication as to whether the current main stand (i.e. the trees of the upper layer) originated from natural regeneration (100% natural regeneration), artificial regeneration (<20% natural regeneration) or mixed regeneration (20-99% natural regeneration). Reference: Forest Service Survey (MID 404: Art der Bestandesentstehung)
(84)
i
Status and type of certification. Reference: Forest Service Survey (MID 319: Art der Zertifizierung)
(60)
i
Status of the forest development plan or a comparable cantonal forest planning document. Reference: Forest Service Survey (MID 803: Stand der Waldentwicklungspläne)
(36)
i
Information on whether the forest road network has been completed or whether an improvment is in progress (construction, project planning) or planned according to the current transportation system plan. Reference: Forest Service Survey (MID 614: Erschliessungsabsichten)
(32)
i
Value of the forest stand as a habitat – in three classes, derived from the attributes: development stage, crown closure, stand structure, proportion of old timber, degree of damage to the stand, presence of forest or stand edge, occurrence and type of gaps in the stand, degree of cover of the herb layer, degree of cover of berry bushes as well as the occurrence of stumps, lying deadwood, snags and piles of branches. Reference: Field Survey (various attributes)
(10)
i
Techniques used in timber harvesting, i.e. for felling, processing and extracting trees – in twelve classes. If timber has been harvested since the last Inventory, the information is based on the procedures actually used. If, on the other hand, no harvesting has taken place, it is based on the procedures which, according to the district forester's assessment, would have been used in the case of an intervention at the time of the current Inventory. Abbreviations: LO: logging, EX: extraction, PS: pre-skidding, FE: felling, PRO: processing, CH: chopping, AS: assortment, FT: full tree. Reference: Forest Service Survey (MID 352: Art der Holzhauerei, MID: 3001: Rückemittel)
(729)
i
Number of years since the last silvicultural treatment – in classes of ten years. Silvicultural treatments include harvesting and tending interventions, planting and afforestation, as well as sanitary and safety interventions. Reference: Forest Service Survey (MID: 607: Anzahl Jahre seit dem letzten Eingriff)
(36)
i
Number of years since the last silvicultural treatment in classes of five or ten years. Silvicultural treatments include harvesting and tending interventions, planting and afforestation, as well as sanitary and safety interventions. Reference: Forest Service Survey (MID: 607: Anzahl Jahre seit dem letzten Eingriff)
(136)
i
Number of years until the next silvicultural treatment according to the forest planning schedule. Silvicultural treatments include harvesting and tending interventions, planting and afforestation, as well as sanitary and safety interventions. Reference: Forest Service Survey (MID 337: Zeitpunkt des nächsten Eingriffs)
(126)
i
Sample plots with/without traces of livestock pasturing in the relevant stand on the interpretation area (50 × 50 m). Traces could be: presence of pasturing livestock, faeces, fresh tracks, resting places, torn hairs and traces of browsing or fraying, and indication of the livestock class in the case of pasturing. Reference: Field Survey (MID 204: Beweidungsart)
(306)
i
Information about the large- and small-scale infrastructure used for the extraction and transport of timber. Reference: Forest Service survey (MID 326: Erschliessungskonzept)
(184)
i
Indication of how the stand is likely to be treated in the next intervention, taking into account local forest functions and planning. Reference: Forest Service Survey (MID 335: Art des nächsten Eingriffs)
(64)
i
Type of stand establishment, with natural and artificial regeneration distinguished. Reference: Field Survey (MID 275: Verjüngungsart)
(36)
i
Year in which the forest was (re)afforested during past centuries – in classes of ten years. Reference: Forest Service Survey (MID 332: Jahr der Aufforstung)
(8)
i
Year in which the forest was (re)afforested in the past – in five classes: «before 1851», «1851-1900», «1901-1950», «1951-2006», or «no afforestation/afforestation unknown.». Reference: Forest Service Survey (MID 332: Jahr der Aufforstung)
(28)
i
Year in which the forest was (re)afforested in earlier periods in six classes: before 1851; 1851-1900; 1901-1950; 1951-2000; 2001-2020; oe «no afforestation/afforestation unknown». Reference: Forest Service Survey (MID 332: Jahr der Aufforstung)
(36)
i
Year in which the forest development plan or a comparable cantonal planning document was put into effect – in six classes. Reference: Forest Service Survey (MID 804: Kalenderjahr der Inkraftsetzung des Waldentwicklungsplans WEP)
(16)
i
Sample plots without/with grazing and year when last grazed on by livestock. Reference: Forest Service Survey (MID 341: Jahr der letzten Beweidung)
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region
(12'771)
i
Demarcation of Switzerland into five regions (Jura, Plateau, Pre-Alps, Alps and Southern Alps) with relatively uniform growth and timber production conditions. The production regions were established by the Federal Office of Forestry long before the first National Forest Inventory (NFI1, 1983-1985). With a small exception along Lake Geneva, the boundaries of the production regions still follow the municipal boundaries of the time. Unlike the NFI, the Forestry Statistics of the Federal Statistical Office don't use the production regions as demarcation but rather the forestry zones, whose boundaries are somewhat different.
(12'771)
i
Division of Switzerland into 14 regions (2 in the Jura, 3 on the Plateau, 3 in the Pre-Alps, 5 in the Alps and 1 in the Southern Alps). The economic regions are a subdivision of the production regions according to economic-geographical criteria.
(12'771)
i
Demarcation of Switzerland used in NFI for protection forest analyses. The six protection forest regions were derived from the economic regions by combining individual regions according to natural and statistical criteria.
(12'771)
i
Regional demarcation with the cantons as a unit, with the two half-cantons, Basel-Land and Basel-Stadt, combined into one canton for statistical reasons.
(12'771)
i
Demarcation of Switzerland into six regions with similar flora and fauna. The six regions correspond to the basic categories in the publication «The Biogeographical Regions of Switzerland», which was published by FOEN in 2022.
(12'771)
i
Regional demarcation with the forest districts as a unit. This variable is based on a survey of the cantonal forest services in winter 2022/2023.
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evaluation area
(744)
i
Area that meets the forest definition of the NFI, i.e. is «forest without shrub forest» or «shrub forest», and can be reached on foot.
(644)
i
Area accessible on foot that meets the NFI's definition of forest in both NFI4 (2009-2017) and NFI5 (2018-2026), i.e. was either «forest without shrub forest» or «shrub forest».
(3'268)
i
Forest of which less than two-thirds is covered with shrubs that can be accessed on foot.
(3'500)
i
Forest that was less than two-thirds covered with shrubs in the five inventories NFI1 (1983-1985), NFI2 (1993-1995), NFI3 (2004-2006), NFI4 (2009-2017) and NFI5 (2018-2026) and was accessible on foot.
(1'666)
i
Forest that was less than two-thirds covered with shrubs in both NFI4 (2009-2017) and NFI5 (2018-2026) and is accessible on foot.
(1'347)
i
Area that meets the NFI's definition of 'forest', i.e. is «a forest without shrub forest» or «a shrub forest».
(644)
i
Area that meets the NFI's definition of forest in both NFI4 (2009-2017) and NFI5 (2018-2026), i.e. was either «forest without shrub forest» or «shrub forest».
(216)
i
Accessible forest without shrub forest («a.f.w.s.f.»), i.e. forest that is less than two-thirds covered with shrubs and can be accessed on foot, which is situated in a forest that the cantons designated «protection forest» in 2022 according to the harmonised criteria of SilvaProtect-CH (Losey & Wehrli 2013).
(58)
i
Accessible forest, i.e. «forest without shrub forest» or «shrub forest» that can be accessed on foot and is situated in a forest that the cantons designated «protection forest» in 2022 according to the harmonised criteria of SilvaProtect-CH (Losey & Wehrli 2013).
(39)
i
Area designated in both the NFI4 (2009-2017) and the NFI5 (2018-2026) as «accessible forest», i.e. «forest without shrub forest» or «shrub forest» that can be accessed on foot and is situated in a forest that the cantons designated «protection forest» in 2022 according to the harmonised criteria of SilvaProtect-CH (Losey & Wehrli 2013).
(216)
i
Area designated in the five Inventories NFI1 (1983-1985), NFI2 (1993-1995), NFI3 (2004-2006), NFI4 (2009-2017) and NFI5 (2018-2026) as «accessible forest without shrub forest», a.f.w.s.f. i.e. «forest without shrub forest» that can be accessed on foot and is situated in a forest that the cantons designated «protection forest» in 2022 according to the harmonised criteria of SilvaProtect-CH (Losey & Wehrli 2013).
(105)
i
Area designated in both NFI4 (2009-2017) and NFI5 (2018-2026) as «accessible forest without shrub forest», a.f.w.s.f. i.e. «forest without shrub forest» that can be accessed on foot and is situated in a forest that the cantons designated «protection forest» in 2022 according to the harmonised criteria of SilvaProtect-CH (Losey & Wehrli 2013).
(90)
i
Forest, i.e. «forest without shrub forest» or «shrub forest», that is situated in a forest that the cantons designated «protection forest» in 2022 according to the harmonised criteria of SilvaProtect-CH (Losey & Wehrli 2013).
(39)
i
Area that, in both the NFI4 (2009-2017) and the NFI5 (2018-2026), conforms with the NFI's definition of «forest», i.e. «forest without shrub forest» or «shrub forest», and is situated in a forest that the cantons designated «protection forest» in 2022 according to the harmonised criteria of SilvaProtect-CH (Losey & Wehrli 2013).
(195)
i
Area of Switzerland or a region (e.g. production region or canton) regardless of its cover. In NFI, the total area is made up of the components «forest without shrub forest», «shrub forest» and «non-forest».
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grid
(8'435)
i
Sub-grids 1, 2, 3, 4 and 5 of the field surveys on the sampling grid with a mesh size of 1.4 km (base grid).
(4'336)
i
NFI's sampling grid with a mesh size of 1.4 km. The 1.4-km grid is the grid size covering all the previous terrestrial Inventories, which is why it is also called the base grid.
LFI5 2018/26
production region
forest area
altitude (in 200 m classes)
accessible forest
1.4 km grid, subgrids 1-5
LFI5 2018/26
production region
forest area
altitude (in 200 m classes)
accessible forest NFI4/NFI5
1.4 km grid, subgrids 1-5
LFI5 2018/26
production region
forest area
altitude (in 200 m classes)
accessible forest without shrub forest
1.4 km grid, subgrids 1-5
LFI5 2018/26
production region
forest area
altitude (in 200 m classes)
accessible forest without shrub forest NFI1-NFI5
1.4 km grid, subgrids 1-5
LFI5 2018/26
production region
forest area
altitude (in 200 m classes)
accessible forest without shrub forest NFI4/NFI5
1.4 km grid, subgrids 1-5
LFI5 2018/26
production region
forest area
altitude (in 200 m classes)
forest
1.4 km grid, subgrids 1-5
LFI5 2018/26
production region
forest area
altitude (in 200 m classes)
forest NFI4/NFI5
1.4 km grid, subgrids 1-5
LFI5 2018/26
production region
forest area
altitude (in 400 m classes)
accessible forest
1.4 km grid, subgrids 1-5
Citation
Abegg, M.; Ahles, P.; Allgaier Leuch, B.; Cioldi, F.; Didion, M.; Düggelin, C.; Fischer, C.; Herold, A.; Meile, R.; Rohner, B.; Rösler, E.; Speich, S.; Temperli, C.; Traub, B.,
2023: Swiss national forest inventory NFI. Result tables and maps of the NFI surveys 1983–2022 (NFI1, NFI2, NFI3, NFI4, NFI5.1–5) on the internet. [Published online 30.05.2023] Available from the World Wide Web <http://www.lfi.ch/resultate/> . Birmensdorf, Swiss Federal Research Institute WSL
https://doi.org/10.21258/1769925