Growth and productivity of forest elements in the salmon forests of the Ural river floodplain

Abstract

Results of the analysis of the course of growth of average heights and efficiency of four forest forming species (a poplar black, a poplar white, willows white, an elm smooth) in four landscape and typological groups of types of the wood of a black poplar stand formation are given. Forest typology models and lines of regression of average, minimum and maximum possible values of average heights of forest stands of different age are presented. Comparison of three-level regressions with curves of a bonitet scale for tree species of rapid growth confirms the need of use of forest typology classes of average heights instead of bonitet classes in classification of efficiency of forest stands. Transition to the new system of curves of the course of growth allows developing ecologically reasonable standard reference materials for classification of forest stands by growth, structure and efficiency.