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Doklady Earth Sciences - Lipid components are an important element of organic residues entering the soil. They are often used as biomarkers to investigate the origin and evolution of organic matter...  相似文献   
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The paper presents the results of studying chemical and biological quality characteristics of the aquatic environment in the area of operation of trout farms in Kondopoga Bay, Onega Lake. The concentrations of biochemically labile substances and phosphorus were found to increase near the ponds. The development dynamics of phytoplankton, zooplankton, and benthic organisms in the zone of pond farms. When the procedure of fish production is strictly followed, the effect of ponds on the aquatic environment and biota is minimal.  相似文献   
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The overall concentration of Cu, Pb, Zn, Cr, Mn, and Fe are determined in the water and bottom sediments of the Selenga River delta. The concentration of Cu, Pb, and Zn is found to decrease in the lower course of the river, at the delta outlet. The concentration of Mn and Fe is found to decrease in the downstream direction from the river's upper course along the investigated delta arms, whereas the concentration of Zn and Cr in certain arms exceeds their concentration in the upper section of the delta.  相似文献   
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Doklady Earth Sciences - The results of measuring the ion composition of the Barguzin River waters during periods of different water contents and assessments of hydrological factors of water flow...  相似文献   
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Doklady Earth Sciences - Small lakes, being less stable systems as compared to large lakes, are sensitive to climate variations and are characterized by high sedimentation rates, and thus, they...  相似文献   
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