Origin and vertical variation of the bound fatty acids in core sediments of Lake Dianchi in Southwest China

	Origin and vertical variation of the bound fatty acids in core sediments of Lake Dianchi in Southwest China
	Lifang Wang; Fengchang Wu; Yongqiang Xiong; Jidun Fang
通讯作者	Lifang Wang
	2013
发表期刊	Environmental Science and Pollution Research
卷号	20 期号:4 页码:2390-2397
摘要	Based on the molecular distribution of bound fatty acid (BFA) compound classes in core sediments of Lake Dianchi combined with the compound-specific delta C-13 values of the straight-chain BFAs, origin and vertical changes of organic matters in the sediments were investigated. The results indicated a significant change of BFA sources over the past 700 years. Contrast to the low concentrations of the terrestrial BFAs, the abundance of BFAs derived from the plankton/bacteria in the top sections (1944-recent) was more than 80 %. The increasing proportions of the branched and unsaturated BFAs in total fatty acids were closely correlated with the heavy eutrophication and the frequent algal blooms in the decades. Furthermore, the positive shift of delta C-13 of C16 and C18 (similar to 2 parts per thousand) in the upper section might be an indicator of the excess phytoplankton productivity. However, it was found that the plankton/bacteria-derived BFAs were more easily degraded during the early diagenetic process. The special compound carbon isotopic compositions of the long straight-chain BFAs (C24 and C26) in the sediments showed a depletion of heavier delta C-13 values (ca. -30 parts per thousand) in the midsections (1559-1787), reflecting a relatively growing contribution of C3 plants to C4 plants or that C4 plant growth was inhibited in cold and arid climates during the period.
关键词	Origin Vertical Variation Bound Fatty Acid Compound-specific Δ13c Core Sediment Lake Dianchi
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.gyig.ac.cn/handle/352002/5095
专题	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_期刊论文环境地球化学国家重点实验室
通讯作者	Lifang Wang
推荐引用方式 GB/T 7714	Lifang Wang,Fengchang Wu,Yongqiang Xiong,et al. Origin and vertical variation of the bound fatty acids in core sediments of Lake Dianchi in Southwest China[J]. Environmental Science and Pollution Research,2013,20(4):2390-2397.
APA	Lifang Wang,Fengchang Wu,Yongqiang Xiong,&Jidun Fang.(2013).Origin and vertical variation of the bound fatty acids in core sediments of Lake Dianchi in Southwest China.Environmental Science and Pollution Research,20(4),2390-2397.
MLA	Lifang Wang,et al."Origin and vertical variation of the bound fatty acids in core sediments of Lake Dianchi in Southwest China".Environmental Science and Pollution Research 20.4(2013):2390-2397.

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