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Inventory

NFI3–NFI4

(2)

2004/06–2009/17

Topic

merchantable branchwood harvested

(2)

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.

fellings

bolewood harvested

(4)

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.

fellings

(66)

Stemwood volume of all trees and shrubs with a diameter at breast height (dbh) ≥12 cm with bark that were harvested between two inventories.

fellings and mortality

(46)

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.

merchantable timber harvested

(2)

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.

sanitary/salvage fellings

(26)

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).

sanitary/salvage fellings due to insects

(4)

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).

sanitary/salvage fellings due to wind

(4)

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).

increment

increment (gross increment)

(72)

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.

net increment

(64)

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.

mortality

fellings and mortality

(46)

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.

mortality

(50)

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.

Classification

conifers and broadleaves

(2)

Type of trees and shrubs ≥12 cm in diameter at breast height (dbh) in two classes (conifers or broadleaves). Reference: Field Survey (MID 50: Baumart)

ownership (2 categories)

(2)

Forest ownership, classified according to the two categories: 'public' and 'private'. Reference: Forest Service Survey (MID 365: Eigentum)

region

canton

(2)

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.

production region

(2)

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.

economic region

(2)

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.

protective forest region

(2)

Demarcation of Switzerland used in NFI for protective forest analyses. The six protective forest regions were derived from the economic regions by combining individual regions according to natural and statistical criteria.

biogeographical region

(2)

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.

forest district (2023)

(2)

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.

evaluation area

accessible forest without shrub forest NFI3/NFI4

(2)

Forest that was less than two-thirds covered with shrubs in both NFI3 (2004-2006) and NFI4 (2009-2017) and could be reached on foot.

accessible forest without shrub forest NFI1-NFI5

(6)

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.

accessible forest without shrub forest NFI2/NFI3

(2)

Forest that was less than two-thirds covered with shrubs and accessible on foot in both NFI2 (1993-1995) and NFI3 (2004-2006).

accessible forest without shrub forest NFI4/NFI5

(2)

Forest that was less than two-thirds covered with shrubs in both NFI4 (2009-2017) and NFI5 (2018-2026) and is accessible on foot.

grid

1.4-km grid

(2)

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.

search result: 2 entries on 1 page

LFI3–LFI4 2004/06–2009/17

canton

merchantable branchwood harvested

ownership (2 categories)·conifers and broadleaves

accessible forest without shrub forest NFI3/NFI4

1.4-km grid

m³/ha/year

1000 m³/year

search result: 2 entries on 1 page

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