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Regularities of Commodity Structure Forming in Shrinking Spruce Forests

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S.V. Koptev

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Mass drying of uneven-age spruce forests in the Northern taiga, has been observed since the late 19th century. New occurrences of mass dying of spruce forests have been marked since the beginning of this century in the forests of the area between the Northern Dvina and Pinega rivers in the Arkhangelsk region. Currently in this area are drying affected about 2.5 million hectares of spruce forests.  Depending on the degree of age groups representation in spruce forests, types of forest conditions, shrinkage size is greatly varies.The stands drying itself and marketability of drying spruce stands is a multifactorial phenomenon. The remaining part of the stands, presented by the young generations, has a reduced commodity structure, in comparison with the similar age generations in untouched forest stands by the drying. The shrinking and the subsequent collapse of the stand reminds uncontrolled selective felling of medium to high intensity, in which the selection is subject to just the generation that risks entering into the category of dried trees under the influence of a complex of factors. On the basis of a trees distribution series, models of selective cutting parameters calculation in spruce forests with various growth conditions and regional assortment tables for the Northern taiga spruce forests, developed by the author, are obtained forecast tables of merchantability shrunken, and the remaining (unaffected by the shrinkage) stands. Due to the drying part of the stand will disturb the natural distribution of the amount of trees in thickness. Therefore, the application of customary forest valuation norms, developed for stands with no signs of mass drying, in most cases, causes errors.


S.V. Koptev, Candidate of Agriculture, Associate Professor
Northern (Arctic) Federal University named after M.V. Lomonosov
Naberezhnaya Severnoy Dviny, 17, Arkhangelsk, 163002, Russia;


Northern (Arctic) Federal University named after M.V. Lomonosov


regularities of stand, overmature generations, selective cuttings, shrinked trees, probable tree fall-off, merchantable structure forecast.


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Regularities of Commodity Structure Forming in Shrinking Spruce Forests


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