экологические факторы

On the basis of our 1996-2009 field surveys in the Saratov region and adjacent territories, and our analysis of the literature data, the distribution and abundance dynamics of Dendrocopos major, D. syriacus, D. medius, D. leucotos, and D. minor is considered. The present habitation of D. leucotos in the Saratov region has been established to be associated with ripe deciduous woods in the Saratov Right-Volga-bank region; the bird penetrates for nesting up to 51°40* lati­ tude North along the Khopyor and Medveditsa river valleys. D.

The formation of the elemental composition of plants is a dynamic process, which is aff ected by a large number of concurrent genetic and environmental factors, and their signifi cance varies according to the conditions and the state of the environment. The goal of the work was to study the characteristics of the accumulation of 8 chemical elements in Scots pine wood under the infl uence of seasonal and ecological variability.

Рассматриваются процессы функционирования почвенного банка семян, реализация его потенциальных возможностей в зависимости от факторов внешней среды, от характера и длительности покоя семян, уровня и длительности сохранения жизнеспособности и особенностей их прорастания в некоторых лесных сообществах Саратовского Правобережья.

The formation of the elemental composition of plants is a dynamic process, which is aff ected by a large number of concurrent genetic and environmental factors, and their signifi cance varies according to the conditions and the state of the environment. The goal of the work was to study the characteristics of the accumulation of 8 chemical elements in Scots pine wood under the infl uence of seasonal and ecological variability. The objects of our research were old-growth forest stands on the territory of the Berezinsky Biosphere Reserve.