Regularities of the Nitrogen and Phosphorus Balance Formation in River Catchments in the Central Forest-Steppe of the Russian Plain in 1990–2020
https://doi.org/10.31857/S2587556621030031
Abstract
On the geographic-hydrological basis and the idea of the plain river basins hydrological stratification modern features of the water-biogenic balance in the forest-steppe zone of the Russian Plain are revealed. The influence of the main elements of river basins’ landscape-hydrological structure on the nutrients content in the surface slope runoff has been determined. It is shown that there was no increase in surface slope runoff in spite of the fact that the urbanized territories’ area as well as the area of agricultural lands removed from crop rotations with a higher runoff coefficient than on fields with autumn plowing increased. Climate change has led to the opposite situation—the surface slope runoff since the early 1980s was declining by 69% on the compacted soil and by 77% on loose arable land. The role of the river runoff surface component in the nutrient’s migration has significantly decreased, while, on the contrary, the underground component role increased. Annually surface runoff removes 41% of nitrogen and 48% of phosphorus, and underground runoff 59 and 52%, respectively. The results of calculating the intra-annual distribution of the mineral nitrogen and phosphorus removal with surface and underground runoff from river catchments are presented. An approximate assessment of the annual water-biogenic balance of the Kursk Oblast territory, formed in the last decade, has been carried out. It is shown that the share of natural factors in its incoming part (nitrogen 17%, phosphorus 6%) is significantly less than that of anthropogenic.
Keywords
river basins,
nitrogen and phosphorus balance,
anthropogenic and natural factors,
surface and underground runoff components,
changes
Supporting agencies: The research was funded by the Russian Science Foundation according to the project no. 20-17-00209 (methodology development, the water-biogenic balance calculation). The role of climatic and anthropogenic factors was analyzed within the framework of the state-ordered research theme of the Institute of Geography RAS no. 0148-2019-0007. The authors are grateful to E.A. Kashutina, E.P. Matafonov, Yu. Alent’ev for participation in the field works, the results of which were used in the article.
About the Authors
S. V. Dolgov
Institute of Geography, Russian Academy of Sciences
Russian Federation
Russian Federation
Moscow
V. O. Shvydkii
Institute of Biochemical Physics, Russian Academy of Sciences
Russian Federation
Russian Federation
Moscow
E. V. Shtamm
Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences
Russian Federation
Russian Federation
Moscow
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For citations:
Dolgov S.V., Shvydkii V.O., Shtamm E.V. Regularities of the Nitrogen and Phosphorus Balance Formation in River Catchments in the Central Forest-Steppe of the Russian Plain in 1990–2020. Izvestiya Rossiiskoi Akademii Nauk. Seriya Geograficheskaya. 2021;85(3):355-367. (In Russ.) https://doi.org/10.31857/S2587556621030031
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