Assessment of biological productivity of modal spruce forests in the taiga zone based on modeling the growth of stands

Abstract

The article provides information on the biological productivity of spruce stands of the Siberian green-moss group of forest types in the taiga zone (Southern ecoregions), which reflects the dynamics of the phytomass fractional composition and the carbon stock in them. The normative reference tables are developed on the basis of mathematical modeling of growth processes in combination with the conversion-volume method for determining the volume of phytomass and its fractional composition based on deposited carbon. Tables of biological productivity of spruce forests in the taiga zone are proposed, which give a quantitative characteristic of the age dynamics of changes in phytomass and the carbon contained in it. The range of phytomass changes in stands of spruce of the green-moss group of forest types over the entire age range in the conditions of the III bonitet class is from 11 to 166.5 t m−3, for the IV bonitet class is from 8.6 to 142.5 t m−3. Carbon pools in quantitative equivalent in spruce forests of the III bonitet class concentrate from 4.0 to 72.5 tC·ha−1, for conditions of the IV bonitet class is from 5.6 to 60.8 tC·ha−1. The obtained results complement the existing database on the biological productivity of taiga forests and can be used in the organization of forest monitoring, implementation of environmental programs at the regional level, including calculations of the carbon cycle.