Impact of high water level fluctuations on stable isotopic signature of POM and source identification in a floodplain lake-Bang Lake (Poyang Lake)

CORC > 地球化学研究所 > 中国科学院地球化学研究所 > 环境地球化学国家重点实验室 > 期刊论文

	Impact of high water level fluctuations on stable isotopic signature of POM and source identification in a floodplain lake-Bang Lake (Poyang Lake)
	Wenhua Li; Yue Liang; Xiaozhen Liu; Huayun Xiao; Xiaofei Gao; Jian Xiong
刊名	Environmental Earth Sciences
	2016
卷号	75 期号:3
英文摘要	In order to recognize impact of water levels on the sources and migration of particulate organic matter in a floodplain lake-Bang Lake (Poyang Lake), suspended particulate matters (SPM), superficial sediment organic matters (SOM) and aquatic plants were collected in and around Bang Lake from June 2012 to May 2013, and their carbon and nitrogen stable isotopic compositions (delta C-13, delta N-15) and organic C/N ratio were determined. The results showed that the delta C-13 and delta N-15 values of SPM obviously changed with water levels. In the flowing period, the SPM showed the most negative delta C-13 (-35.4 to -30.8 parts per thousand), delta N-15 (+4.2 to +7.6 parts per thousand) and C/N > 8, suggesting that SPM in the period was mainly derived from C-13-depleted land C-3 plants. The highest delta C-13 and C/N ratios of SPM appeared in the flooding period because the lake and river were connected and the soil organic matter and the river-derived SPM were input to the lake. In the lowering period, the relatively lower delta C-13 and delta N-15 values of SPM were almost consistent with those of the decayed aquatic plants, meaning that aquatic plants were the main components of the SPM. In the lentic period, the delta C-13 and C/N ratios of SPM were similar to those of SOM due to the re-suspended SOM in the shallow lake. The SOM in the lentic period (delta C-13: -30.4 to -25.5 parts per thousand) mainly came from the decline of aquatic plants. With water level rising, the delta C-13 of SOM turned to be higher (-26.1 to 24.3 parts per thousand), while the C/N ratios changed small. It may be the result of that fast water flow scoured and suspended the surface of sediment. The delta C-13 and C/N ratios of aquatic plants changed obviously with water levels, which was mainly due to the seasonal variation of photosynthesis and respiration. The delta N-15 values of aquatic plants were dependent on that of water-soluble N at different water levels. These results indicated that the sources of the organic matter in the lake were obviously influenced by the water levels.
学科主题	环境地球化学
语种	英语
公开日期	2017-05-25
内容类型	期刊论文
源URL	[http://ir.gyig.ac.cn:8080/handle/352002/6145]
专题	地球化学研究所_环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文
推荐引用方式 GB/T 7714	Wenhua Li,Yue Liang,Xiaozhen Liu,et al. Impact of high water level fluctuations on stable isotopic signature of POM and source identification in a floodplain lake-Bang Lake (Poyang Lake)[J]. Environmental Earth Sciences,2016,75(3).
APA	Wenhua Li,Yue Liang,Xiaozhen Liu,Huayun Xiao,Xiaofei Gao,&Jian Xiong.(2016).Impact of high water level fluctuations on stable isotopic signature of POM and source identification in a floodplain lake-Bang Lake (Poyang Lake).Environmental Earth Sciences,75(3).
MLA	Wenhua Li,et al."Impact of high water level fluctuations on stable isotopic signature of POM and source identification in a floodplain lake-Bang Lake (Poyang Lake)".Environmental Earth Sciences 75.3(2016).