Abstract
<jats:p>The aim is to analyze the quantitative content and distribution of nitrogen and phosphorus forms in the littoral zone of Lake Arakhley (Trans-Baikal Territory) in 2017, and to assess the trophic status of the reservoir in terms of the content of biogenic elements under anthropogenic stress. The results of chemical analyses of water samples from Lake Arakhley during the open water period of 2017 are presented. The potentiometric and colorimetric hydrochemical methods were used in the study. The quantitative content of nitrates, nitrites, ammonium ion, phosphates and total phosphorus was determined. The regime of biogenic elements in the Spring, Summer and Autumn biological seasons of 2017 is analyzed. The factors determining the development of the ecosystem of the reservoir are highlighted. The results of hydrochemical studies have shown that the distribution of biogenic elements in the littoral zone is not uniform throughout the study area. The waters of Lake Arakhley correspond to the mesotrophic type. Despite the low concentrations of biogens, it is necessary to continue monitoring the condition of the reservoir, since the study of Lake Arakhley is of scientific and regional importance. The data obtained make it possible to better understand the processes occurring in freshwater mesotrophic ecosystems under anthropogenic influence, especially in the coastal zone.</jats:p>