Biota climatic dependence (with Western Siberia as an example)
1Institute of Problems of Development of the North, Siberian Branch of RAS
625003 Tyumen, POB2774
2Tyumen Industrial University
625000 Tyumen, Volodarskogo, 38
e-mail: Konov7@rambler.ru
Quantitative patterns of biota structural components distribution on the territory of Western Siberia (in bounds of Tyumen and Omsk Regions) are studied. It is shown that they are climatic-dependent. Two phyto-spheres are marked out, namely the Northern one (which is cold and humid) and the Southern one (which is warm and arid). The boundary between them lies along the aridity index isoline close to 1. Here, heat and moisture intakes are in balance, leading to optimal conditions for biota. In the Northern phyto-sphere, vegetation biomass, richness and diversity of biota increase in the north-south direction following the increase in heat intake. On the contrary, in the Southern one, those indices decrease following the decrease in moisture intake. Quantitative expressions for zonal distribution of biotic indices are established. For the purpose of zonal distribution analysis and estimation, the conception of thermic shared indices associated with different thermal intervals (0—5, 5—10, 10—15, 15—0oC) is introduced. A formula for approximate estimation of hierarchical distribution of taxa numbers is proposed.
