Release:Bulletin of Tyumen State University. Ecology (№12). 2012
About the authors:Natalia A. Gashkina, Cand. Geograph. Sci., senior scientist, Institute of Geochemistry and Analytical Chemistry, named after V.I. Vernadskiy
Abstract:The characteristic of lakes distribution on trophic state and the assessment of distribution and ratio of nutrients and organic matter on latitudinal direction based on large-scale research of water chemistry of small lakes on Europern teritory of Russia and Western Siberia were represented. The distinctive feature of WS lakes in the tundra, forest-tundra and taiga is high nitrate concentration in water and higher trophic level then lakes in same zone of ETR. The zonal regularities of lake trophy limitation on main nutrients were revealed. It is shown that, in lakes of the tundra and taiga zones of ETR, conditions for algae development are limited by both phosphorus and nitrogen, although at the critical level, nitrogen becomes the leading factor. Whereas in lakes of the tundra and taiga zones of WS conditions for algae development are no limited at the critical level by both phosphorus and nitrogen. The mineral phosphorus deficiency becomes apparent at the lower trophic levels whereas nitrogen — at the higher trophic levels.