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The productive functions (FE/C3)

Felling [m3 u.b./year].

NFI more detailed results are available here.

Geographical domain
Sorting criterion
Point estimate
The most probable value
Standard deviation
Point estimate standard deviation
Variation coef. %
Procentual expression of the standard deviation since the point estimation values
Sample size
Sample size
Min. sample size
Min. sample size
Interval estimation
Interval estimation

Table information

Topic: The productive functions (FE/C3).
Indicator: Felling.
Period: The period between surveys of the NFI1 (2001–2004) and NFI2 (2011–2014).
Unit of measurement: Cubic metre underbark per year.
Population: Only stems (trees) with the dbh of at least 7 cm overbark at the time of felling are included in the estimate of felling. Felling of old, standing, dead stems which were described as standing dead stems already within the previous inventory is excluded.
Definition: The average annual felling (of the considered population). The felling relates to the selected period. A merchantable wood volume of a stem is calculated according to the ÚLT volume tables on the basis of the dbh (d13) and total height (h) of stems (trees) included in the calculation. The merchantable wood volume is deducted from the tables for the dbh measured in the previous inventory, increased by the model increment (GADA model) until the middle of the period between the two surveys (generally estimated time of felling). The height of the stem (tree) was deducted from the height curve (parametrized for a particular woody species and stand segment) for the already updated breast height diameter. Then it was corrected considering the value of the residue observed within the first inventory - the deviation of the particular stem height from the model curve, found within the first inventory, was carried over to the presumed time of felling. In this way, the increment of particular felled stems (trees) between the previous inventory survey and the time of felling is considered. The evaluation is based on Eriksson‘s methodology (1995). Merchantable wood means all the above-ground, woody parts of a tree that reach a thickness of 7 cm overbark (the thickness is measured perpendicular to the longitudinal axis of the piece). Merchantable wood includes branches or their parts reaching at least a 7 cm thickness o.b. A stump (after possible felling) or a stem’s top under 7 cm o.b. is not considered to be merchantable wood. The coefficients of the conversion of the merchantable wood volume overbark to the volume underbark correspond to Decree No. 84/1996 Coll., i.e. 100/110 for conifers and 100/115 for broadleaves. Felling related to area size changes of the forest land category (conversion of forest to other land categories) is not included. The assessment of felling is limited to an area that was accessible and belonged to the forest land category at the time of the survey of both considered inventories. On individual sample plots, deviations from the nominal length of the period between inventory surveys were considered by recalculating the estimate for one year.
Area: Accessible part of the productive forest area within the area which was both in the current and previous inventory identically classified as a forest land category according to the definition of FAO FRA (Forest Resource Assessment). Those inventory plots are considered where it was possible to clearly identify the stems (trees) and assess the status of change in relation to the state of the previous inventory. There are also plots (the area represented by these plots) where it was not possible to identify and assess change at the level of individual stems, but the change status could have been reliably derived from the context. E.g. fully felled inventory plots are also included (all stems registered in the previous inventory have been marked with the change status of "felled") or plots within which the growth phase of a clearcut, plantation or natural seeding (up to 1.3 m tall) has been described and simultaneously no merchantable wood stem has been registered (all living merchantable wood stems registered in the current inventory have received the status of "recruitment").
Confidence interval: The confidence interval is constructed at a 95% confidence level (significance level alpha = 0.05).
Geographic domain type: Nomenclature of Territorial Units for Statistics, level 0 + 1 – state.; Nomenclature of Territorial Units for Statistics, level 3 – region.
Attribute domain: The group of conifers or broadleaves.

Attribute graph category selection: