Abstract:Fifteen surface sediment samples from the Poyang Lake and its main tributaries (Ganjiang River, Fuhe River, Xinjiang River, Xiushui River and Raohe River) were used to investigate organic carbon and nitrogen isotopes. In addition, the sources of organic matter and nitrogen in the surface sediments were analyzed. The total organic carbon (TOC) content in the lake, averages (1.15±0.35)% (n=9) in a range of 0.63% to 1.86%, was higher than that of its main tributaries. The total nitrogen (TN) content in the Poyang Lake area and its main tributaries was in the ranges of 0.06%~0.16% and 0.03%~0.08% with an average value of (0.10±0.03)% (n=9) and (0.06±0.02)% (n=6), respectively. The organic carbon isotope composition (δ13C) ranged from -25.66‰ to -12.56‰ (average (-22.48±4.10)‰), whereas the nitrogen isotope composition (δ15N) was from 3.51‰ to -6.27‰ (average (4.71±0.95)‰) in the Poyang Lake area surface sediments. The δ13C and δ15N values ranged from -25.24‰ to -19.55‰ (average (-23.27±2.42)‰) and 0.94‰ to 4.64‰ (average (3.19±1.30)‰) in the main tributaries surface sediments, respectively. Soil organic matter, aquatic vascular plant and phytoplankton were the main sources of the sediment organic matter in the Poyang Lake and its main tributaries, while the contribution of soil organic matter was biggest. The sources of nitrogen in the sediment were mainly from soil organic matter and synthetic fertilizer. The contribution of synthetic fertilizer was found to be a significant source for the tributaries sediment.
王毛兰, 赖建平, 胡珂图, 张丁苓, 赖劲虎. 鄱阳湖表层沉积物有机碳、氮同位素特征及其来源分析[J]. 中国环境科学, 2014, 34(4): 1019-1025.
WANG Mao-Lan, LAI Jian-Ping, HU Ke-Tu, ZHANG Ding-Ling, LAI Jin-Hu. Compositions and sources of stable organic carbon and nitrogen isotopes in surface sediments of Poyang Lake. . CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(4): 1019-1025.