Место издания:Nova Science Publishers, Inc., United States New York
Первая страница:181
Последняя страница:210
Аннотация:Agricultural pollution of water bodies is a crucial problem that impose limitations for both land use in floodplains and water supply. The solution can be found either in improvement of agricultural technologies or in better adaptation of land use to landscape spatial pattern and matter flows. The paper focuses on possible natural mechanisms that can perform protective functions in relation to small rivers in the intensively cultivated agro-landscape. The typical attributes of the floodplains landscape structure were studied on the example of the East-European middle taiga (the Severnaya Dvina River basin). We examined factors of the floodplain development in connection with landscape-geochemical structure of elementary catchments with particular focus on system-forming lateral flows. We identified various flowpaths of the dissolved matter washed out from eroded slopes in the agro-landscapes. In the lowest sections of the catenas specific landscape neighborhoods induce geochemical contrasts resulting in the development of the barrier zones at the floodplains. Retention capacity of biogeochemical barriers was evaluated quantitatively as well as involvement of nutrients in water migration. We detected differences in retention functions of biogeochemical barriers dependent on bio-availability of trace elements in acid and alkaline soils. The loss of nutrients with ion discharge in the agro-landscapes requires preservation of floodplains barrier functions to ensure effective ecological network.
