Abstract:Fifteen samples from the Poyang Lake and its main tributaries (Ganjiang River, Fuhe River, Xinjiang River, Xiushui River and Raohe River) were collected to analyze organic carbon and nitrogen isotopes in suspended particles. In addition, the sources of organic matter and nitrogen in the suspended particulate organic matter were analyzed. The results showed that the organic carbon isotope composition (δ13CPOM) ranged from -26.59‰ to -24.91‰(n=9) and -27.10‰ to -25.88‰ (n=9) whereas the nitrogen isotope composition (δ15NPOM) was from 5.88‰ to 17.49‰ and 2.99‰ to 19.69‰ in low water period and high water period, respectively in Poyang Lake area. In the suspended particulate organic matter of the main tributaries, the δ13CPOM values ranged from -27.79‰ to -25.22‰(n=6) and -28.07‰ to -26.02‰(n=6)whereas the δ15NPOM was from 2.87‰ to 9.26‰ and 2.12‰~8.75‰ in low water period and high water period, respectively. The C3 plants were the main sources of the suspended particulate organic matter in Poyang Lake and its main tributaries. The sources of nitrogen in the suspended particulate organic matter were complex. Domestic sewage, chemical fertilizer and soil erosion were the main sources of nitrogen in the suspended particulate organic matter in the Poyang Lake. Whereas the chemical fertilizer, terrestrial organic matter and soil erosion were the main sources of nitrogen in the suspended particulate organic matter in its main tributaries.
王毛兰, 张丁苓, 赖建平, 胡珂图, 赖劲虎. 鄱阳湖水体悬浮有机质碳氮同位素分布特征及来源探讨[J]. 中国环境科学, 2014, 34(9): 2342-2350.
WANG Mao-Lan, ZHANG Ding-Ling, LAI Jian-Ping, HU Ke-Tu, LAI Jin-Hu. Distribution and sources of stable organic carbon and nitrogen isotopes in suspended particulate organic matter of Poyang Lake. CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(9): 2342-2350.