骆马湖表层沉积物有机质分布特征及来源解析

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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.

Key words： surface sediments organic matter carbon and nitrogen isotope carbon-nitrogen ratio source analysis

Received: 11 March 2021

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X522

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	LIU Qian
	PANG Yan
	XIANG Song
	WAN Lin

Cite this article:

LIU Qian,PANG Yan,XIANG Song等. Distribution characteristics and source analysis of organic matter in surface sediments of Luoma Lake[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(10): 4850-4856.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I10/4850

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