Trees Mortality Dynamics in Mid-Taiga Mixed Aspen Stands in the Arkhangelsk Region

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630*5

DOI:

10.17238/issn0536-1036.2015.1.152

Abstract

Dynamics of trees mortality in mixed modal aspen mid-taiga forests of the Arkhangelsk region was studied on materials of scientific permanent plots. Studies have confirmed that the mortality is observed in all gradations of thickness. Regardless of age the mortality is predominantly in small-diameter parts of forest stands, individual trees of different thickness die most often in the result of damage by fungi or from natural disasters. The amount of trees per unit area begins to decrease since the crown linkage, when begins to increase trees competition among themselves for light and space. From a certain age, according to our data after 30 years - intensive mortality of thin aspen trees is terminated. Long-term observations on permanent plots indicate a certain regularity in the amount of trees. According to all regularities of stands growth the amount of trees varies evenly and is expressed by hyperbolic curve. In nature this process is uneven and depends on many factors: competition for power and light, natural phenomena, pathological changes and disease. Natural trees mortality of different species is various. Using data from permanent sample plots, laid in mixed stands dominated by aspen, mathematical models of change in the amount of trees with age in aspen, pine, spruce and birch species have been received. Reducing the amount of trees is going intensively to 30 years. Similar data was received by N. Chuprov for birch. Intensive mortality in birch stands starts from 10 years and begin to reduce considerably with age of 30 years. After 50 years mortality in mixed aspen forests is for aspen: 5-7 trees, birches: 3-4 trees per year, for pine and spruce: 1-2 trees per year. V.I. Levin and V.I. Kalinin studying dynamics of pine stands of middle taiga found that you can mark the trees that will be dying in 10 to 15 years and to choose them, increasing forest productivity actually using this part of stands. On the use of mortality are based intensive models of forest management and forest use in the Scandinavian countries, where at the expense of timely thinning get up to 35 % of merchantable timber per unit area in the process of forest regeneration.

Authors

A.A. Gorbunov, Postgraduate Student S.V. Tretjakov, Doctor of Agriculture, Associate Professor

Affiliation

Northern (Arctic) Federal University named after M.V. Lomonosov, Naberezhnaya Severnoy Dviny, 17, Arkhangelsk, 163002, Russia; е-mail: gorbunov@titans.su

Keywords

natural mortality, dynamics, thinning, modal aspen forests, modelling.

References

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