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Media type:
E-Article
Title:
Biogeochemical Cycles of Elements in Some Natural Zones of the European USSR
Contributor:
Evdokimova, T. I.;
Grishina, L. A.;
Vasilyevskaya, V. D.;
Samoilova, E. M.;
Bystritskaya, T. L.
imprint:
Swedish Natural Science Research Council, 1976
Published in:Ecological Bulletins
Language:
English
ISSN:
0346-6868
Origination:
Footnote:
Description:
<p>The problem of the fate of C, N, P, K, Ca, Mg and S in the biosphere under natural conditions and under man's impact is discussed for tundra and forest-tundra, forest, forest-steppe, and steppe zones of the European USSR. Phytomass reserves, together with the annual phytomass increment and transfer into litter, are given in addition to figures for precipitation and runoff for all systems. Prehistoric and present time patterns have been estimated in order to visualize the role of man's activities. The inputs and outputs of biophilic elements have been balanced for the different zones to see whether they are accumulating or losing any component. An attempt is also made to compare the rate of drawing elements into the biological and geological cycles for all zones. In the tundra zone the ratios of the two cycles are closer to each other for most elements than in plant communities of other zones. Cultivation of virgin and forest areas has increased the supply of elements to the geological cycle.</p>