Abstracts

Soil Ecosystems

Under continuous aerotechnogenic pollution there was found increase of substance and energy consumption for adaptive restructuring of individual components and agroecosystem in general accompanied by changes in structure and functions. Exchange processes change in such a way that ecological equilibrium is sustained at the expense of more intensive consumption of both internal and external resources.

The study is focused on the impact of character and level (acceptable limiting value) of various soil type pollution on agroecosystem functioning regime and its state; agroecosystem is studied as a hierarchically organized system soil-microorganisms-plants-atmosphere. Response to pollution is formed due to interconnected reactions in agroecosystem, which provide changes in biogeochemical cycles. Agroecosystems functioning regime was evaluated via revealing regularities integrated by flows in nitrogen cycles, whose quantitative parameters were determined in field studies with 15N isotopes.

Earlier devised scale of ecological norm-setting (Pomazkina et al., 1999) was used for evaluation of aerotechnogenic pollution in spring wheat agroecosystems on various soil types. Impact on agroecosystem was found to be “critical” on alluvial soil. In agroecosystems on gray forest soils is correlates with “acceptable limiting” level, as on the soils polluted by heavy metals (acceptable level of overall pollution), as well as on the soils polluted by water-soluble fluorides (acceptable limiting values 3 and 6). On soddy-meadow soil the level of impact on agroecosystems is assessed as “acceptable”, which is conditioned by their resistance.

Thus, despite differences in soils character and pollution level, ecological load on agroecosystems depends on soil properties and

Note. Abstracts are published in author's edition

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