Actual dynamics of nutrients in the Mozhaisk reservoir
Abstract
The paper deals with the seasonal dynamics of nutrients in the Mozhaysk reservoir in 2018/2019. The factors of seasonal variability of the vertical distribution of nitrogen, phosphorus and mineral silicon compounds are considered basing of monthly measurements.
The regime of nutrients in the Mozhaysk reservoir and the ratio of their various forms is largely determined by the formation and duration of the density stratification of water. During hypoxia phosphorus and ammonium are recovered from the bottom sediments. By the end of summer nitrates and dissolved mineral phosphorus are almost completely consumed by algae in the epilimnion. During the growing season organic phosphorus occur mainly in suspended form within the phytoplankton cells. Mineral silicon is actively consumed in May during the development of diatoms, while in the hypolimnion its concentration is stable throughout the period of stratification. Longitudinal heterogeneity in the nutrient content is caused by both the mixing conditions, and the varying genesis of water mass in a particular area of the reservoir.
It is shown that over the past 30 years the internal nutrient load in the reservoir has increased as a result of increasing duration of density stratification and, as a consequence, the period of anoxia. At the same time, the input of nitrogen and phosphorus compounds to the reservoir with rivers has decreased as a result of land-use change.
Supporting agencies: The study was financially supported by the Russian Science Foundation (project № 19-77-30004), the Russian Foundation for Basic Research (project № 19-05-00087-а), and the Russian Geographical Society (project «The Moskva River from the source to the mouth: hydrological and geochemical assessment of the environmental state»).
About the Authors
O. N. Erina
Lomonosov Moscow State University
Russian Federation
Faculty of Geography, Krasnovidovo Research Station, Scientific Researcher, PhD. in Geography
Russian Federation
Faculty of Geography, Krasnovidovo Research Station, Scientific Researcher, PhD. in Geography
M. A. Tereshina
Lomonosov Moscow State University
Russian Federation
Faculty of Geography, Krasnovidovo Research Station, Engineer
Russian Federation
Faculty of Geography, Krasnovidovo Research Station, Engineer
L. E. Efimova
Lomonosov Moscow State University
Russian Federation
Faculty of Geography, Department of Land Hydrology, Senior Scientific Researcher, PhD. in Geography
Russian Federation
Faculty of Geography, Department of Land Hydrology, Senior Scientific Researcher, PhD. in Geography
D. I. Sokolov
Lomonosov Moscow State University
Russian Federation
Faculty of Geography, Krasnovidovo Research Station, Senior Scientific Researcher, PhD. in Geography
Russian Federation
Faculty of Geography, Krasnovidovo Research Station, Senior Scientific Researcher, PhD. in Geography
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Review
For citations:
Erina O.N., Tereshina M.A., Efimova L.E., Sokolov D.I. Actual dynamics of nutrients in the Mozhaisk reservoir. Vestnik Moskovskogo universiteta. Seriya 5, Geografiya. 2020;(3):81-90. (In Russ.)
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