Impacts of Land Use on the Source of Dissolved Fatty Acids in Epikarst Spring During Rainy Season

Fatty acids were quantitatively analyzed by gas chromatography-mass spectrometer (GC-MS). Dissolved fatty acids were collected from Nanchuan epikarst spring. The results of BQ, LQ, HQ showed that the average contents of fatty acids were 14870, 12912 and 8801 ng·L from May to July, respectively, and...

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Bibliographic Details
Published inHuanjing kexue Vol. 37; no. 8; p. 3049
Main Authors Zhang, Mei, Sun, Yu-Chuan, Xie, Zheng-Lan, Yu, Qin, Zhao, Rui-Yi, Liang, Zuo-Bing
Format Journal Article
LanguageChinese
Published China 08.08.2016
Subjects
fatty acid
microorganism
epikarst spring
land use
biomarker
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Summary:Fatty acids were quantitatively analyzed by gas chromatography-mass spectrometer (GC-MS). Dissolved fatty acids were collected from Nanchuan epikarst spring. The results of BQ, LQ, HQ showed that the average contents of fatty acids were 14870, 12912 and 8801 ng·L from May to July, respectively, and followed the order of SFA> MUFA> BrFA> PUFA. The monomers with highest content were C16:0 and C18:0. From May to July, the fatty acid content increased in BQ , LQ, HQ. The differences in vegetation coverage and bedrock bare rate, as well as the interaction of the dilution effect and soil transfer increase, led to the changes in content and the composition of the fatty acids. Based on the molecular characteristic indices of fatty acids, like H/L, CPI , TAR about BQ, LQ, HQ, and contents of fatty acids which were mainly originated from bacteria, phytoplankton or terrigenous higher plant, it was indicated that fatty acids were mainly originated from higher plant in LQ in May, from phytoplankton input in HQ in July, wh
ISSN:0250-3301
DOI:10.13277/j.hjkx.2016.08.028