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Inventory: NFI1 1983/85

Topic: total basal area NFI1 [238]

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.

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Topic (target variable)

total basal area NFI1

(72)

area

forest area

(6'551)

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.

basal area

(468)

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.

basal area of deadwood NFI1

(96)

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.

biomass

biomass of living trees

(72)

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.

biomass of living trees, aboveground

(36)

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.

stemwood mass of living trees

(48)

Dry weight (mass) of the stemwood with bark of the living trees and shrubs with a diameter at breast height (dbh) ≥12 cm.

forest plots

proportion of forest plots

(120)

Proportion of sample plots that meet the forest definition of NFI, i.e. are covered by "forest without shrub forest" or "shrub forest".

sample size (number of forest plots)

(108)

Number of forest sample plots (Plots).

number of stems

number of deadwood stems NFI1

(72)

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.

number of stems

(1'666)

Number of stems of living trees and shrubs (standing and lying) with a diameter at breast height (dbh) ≥12 cm.

stand density index (SDI)

(24)

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.

total number of stems NFI1

(612)

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.

volume

growing stock (stemwood)

(2'674)

Stemwood volume of living trees and shrubs (standing and lying) with a diameter at breast height (dbh) ≥12 cm with bark.

total wood volume (stemwood) NFI1

(431)

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.

volume of deadwood (stemwood) NFI1

(312)

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

diversity of woody species

(48)

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.

number of woody species (≥ 12 cm dbh)

(12)

Number of tree and shrub species with a diameter at breast height (dbh) ≥12 cm within the 200 m² circle on the sample plot.

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