Исследование экосистемы Харанорского водохранилища по результатам оценки первичной продукции планктона

Abstract

This article presents the results of the assessment of production and destruction processes in the ecosystem of the Kharanorsk reservoir-cooler, used as a cooling pond of the Kharanorsk hydroelectric power station. The content of dissolved oxygen in the water of the reservoir is ubject to seasonal dynamics corresponding to biochemical processes occurring in the reservoir. In spring and autumn, the concentration of dissolved oxygen is in the range from 12.6 to 14.2 mg / L. We attribute the decrease in oxygen content in the summer month to 9.6 mg / L with an increase in air temperature and with the thermal effect of thermal power plants, which in total lead to an intensification of the processes of biochemical decomposition of organic and oxidation of mineral substances. High production capabilities of the ecosystem in both the central and littoral zones were found in July in the surface horizons of the water column (3.53 mgO2 / L – littoral; 3.92 mgO2 / L – center). The formation of organic matter in the direction “surface horizon - bottom layers” of the water column in the central zone decreases due to a decrease in the transparency of the water column. The cessation of the production of organic matter by phytoplankton in the bottom layers of the littoral zone we associate with the competitive relationship of bottom organisms in the use of nutrients. It has been established that the rate of daily production increases from April to July and begins to fall in October, but remains high relative to spring indicators in both the central and littoral zones of the reservoir. The studies are necessary for subsequent environmental monitoring studies, as well as for making managerial decisions to maintain the sustainability of the reservoir ecosystem.