Table 5 Comparison of methods for calculating mean forest taxation indices of stands between Russia and Finland
Forest taxation indices | Unit of measurement | Methods used for calculation of mean forest taxation indices | |
|---|---|---|---|
Russia (on approval of forest management instruction, 2011) | Finland (Pykalainen and Kurttila 2009) | ||
Basic unit for forest management | Site | Site | |
Area of stratum | ha | From 0.5 | 0.5–2.0 |
Mean diameter (d)a | сm | Empirical measurements of diameters at a height of 1.3 m. It is calculated as the quadratic average | Empirical measurements of diameters at the height 1,3 m |
Mean height (h) | m | Empirical measurements of height of 3–5 mean trees with each class diameter | Empirical measurements of height of 3 mean trees |
Relative density (p) | Total basal area per ha of stands relative to the total basal area of a normal stand (p = 1), derived from the yield table for the considered area | Not used | |
Sum of basal area in the stand | m2/ha | Measured with Bitterlich’s angle gauge | Measured with Bitterlich’s angle gauge |
Age of stand | years | Count of annual rings from an increment core collected at the root collar (3–5 mean trees are chosen) | Calculation of annual rings of mean trees |
Number of trees | trees/ha | Use of the inventory data at a sample area | Use of the inventory data at a sample area |
Stand composition | % | By the share of the tree species volume in the total stand volume | By the share of the tree species volume in the total stand volume |
Stand volume | m3/ha | Use of the tables; input data in the tables are the sum of basal area of trees in a stand and mean height | Use of the tables; input data in the tables are the sum of basal area of trees in a stand and mean height |