Productivity of forest ecosystems in dependence on ecological conditions of growing

Proposed is a method for assessing the biological productivity of forest ecosystems, which allows to overcome the disadvantages inherent in the traditional methods, not taking into account the significant statistical heterogeneity of stands on a number of morphometric parameters that change in the process of forest ecosystem development. The concepts and tools of the theory of stationary random functions were used in the development of the method. The central idea of the proposed method is the concept of a hypothetical average tree characterizing the growth of a pure stand at the main stages of its development. The final result of this methodological approach is the stand bioproductivity index, which provides a quantitative assessment of bioproductivity and allows comparing the bioproductivity of pure stands growing in different climatogeographical conditions. The practical application of the method is considered on the example of stands of Siberian fir (Abies sibirica Ledeb.). The relative error of the bioproductivity index of fir stands is estimated. The method was validated on the basis of revealing correlations between the index of fir stand bioproductivity and ecological assessments of habitats obtained using phytoindicator properties of the ground cover.