Biotic and Abiotic Components in the System “Watercourse and Its Catchment” of the Small River Polezhaevka (Amur River Basin)
摘要
The interaction of abiotic and biotic components between the aquatic environment and soil was analyzed using the example of a small river catchment area in an urban area. Water quality was assessed as “polluted” based on a set of indicators. Similarity in the values of biogeochemical characteristics of bottom sediments and soils was revealed. The average content of organic carbon Corg was 5.9 in bottom sediments and 6.8% in soil. The excess of the background level of hydrocarbons in bottom sediments (100 mg/kg) was no higher than 1.6 times, in soil it was 1.2–1.7 times. The share of hydrocarbons in the composition of organic matter did not exceed 0.4% in bottom sediments and 0.21% in the catchment soil. The total content of phytopigments in bottom sediments and soil did not differ significantly—34.89 and 29.31 μg/g, respectively. The contribution of primary production, estimated by the content of Chl a in the total content of Corg, averaged 1.53 in bottom sediments and 0.61% in soil. Carotenoids dominated in the composition of phytopigments of soils and bottom sediments. When studying the molecular composition of n-alkanes, it was shown that the predominant type of organic matter in both soil and bottom sediments is terrigenous matter, genetically associated with higher vegetation and found in the studied objects in the form of transformed hydrocarbons.