Distribution characteristics and source analysis of organic matter in surface sediments of Luoma Lake
LIU Qian1,2, PANG Yan1,2, XIANG Song1,2, WAN Lin3
1. Institute of Lake Environment, Chinese Research Academy of Ecological and Environmental Science, Beijing 100012, China; 2. National Engineering Laboratory For Lake Pollution Control and Ecological Restoration, Beijing 100012, China; 3. Master Dissertation of Suzhou University, Suzhou 215009, China
Abstract:In order to analyze the influencing factors of eutrophication sediment in Luoma Lake, In September 2018, samples of surface sediments at 32point positions of Luoma Lake were collected, and their biogeochemical indexes including total organic carbon (TOC), total nitrogen (TN), organic carbon isotope (δ13C) and nitrogen isotope (δ15N) were analyzed, with the aim to explore the distribution characteristics and sources of organic matter in the surface sediments of such area. The results showed that TOC content in surface sediments ranged from 0.55% to 3.76%, with an average value of 1.62%; TN content of the total nitrogen ranged from 0.04% to 0.46%, with an average value of 0.19%; δ13C content of organic carbon isotope ranged from -27.32‰ to -8.36‰, with an average value of -14.98‰; δ15N content of organic nitrogen isotope ranged from -1.92‰ to 10.17‰, with an average of (7.72±2.55)‰. The spatial distribution of TN and TOC was positively correlated, and the spatial distributions of organic carbon and nitrogen isotopes affected by different sources of organic matter were quite different. Through the qualitative analysis of δ15N and δ13C with C/N and the quantitative calculation of the end-member hybrid model, it is concluded that there were three main sources of organic matter in the surface sediments of Luoma Lake. The first is that the contribution rate of exogenous contamination of soil organic matter caused by human activities was generally the largest,especially in the leisure tourism areas along the east coast. The second is that the endogenous pollution caused by barrier net aquiculture had increased the degree of lake eutrophication. The third is that the organic matter of sewage with higher concentration of pollutants brought by the inflow water of the lake had a great impact on the "typical water-carrying" lake of Luoma Lake. Therefore, there is need to intensify controls over the sources of the abovementioned three kinds of organic matters, thus reducing the degree of lake eutrophication.
刘倩, 庞燕, 项颂, 万玲. 骆马湖表层沉积物有机质分布特征及来源解析[J]. 中国环境科学, 2021, 41(10): 4850-4856.
LIU Qian, PANG Yan, XIANG Song, WAN Lin. Distribution characteristics and source analysis of organic matter in surface sediments of Luoma Lake. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(10): 4850-4856.
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