Compound-specific hydrogen isotopes of long-chain n-alkanes extracted from topsoil under a grassland ecosystem in northern China
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- 作者：ZhiGuo Rao (1) (2)
ZhaoYu Zhu (2)
GuoDong Jia (2)
Xiao Zhang (1)
SuPing Wang (1) - 关键词：C3 grassland ; surface soil ; long ; chain n ; alkanes ; compound ; specific hydrogen isotope
- 刊名：Science China Earth Sciences
- 出版年：2011
- 出版时间：December 2011
- 年：2011
- 卷：54
- 期：12
- 页码：1902-1911
- 全文大小：593KB
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ZhaoYu Zhu (2)
GuoDong Jia (2)
Xiao Zhang (1)
SuPing Wang (1)
1. Key Laboratory of Western China’s Environment Systems (Ministry of Education), Lanzhou University, Lanzhou, 730000, China
2. Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China - ISSN：1869-1897
文摘
To investigate characteristics of H isotope variation in long-chain n-alkanes (δD n-alkanes) from higher plants in surface soils under a single ecosystem, 12 samples from a basalt regolith were randomly collected from Damaping in Wanquan County of Zhangjiakou in North China. Molecular distribution and C (δ 13C n-alkanes) and H isotopes of long-chain n-alkanes, as well as C isotopes of TOC (δ 13CTOC), were analyzed. Both δ 13CTOC and δ 13C n-alkanes values from four representative dominant long-chain n-alkanes (n-C27, n-C29, n-C31, n-C33) derived from terrestrial higher plants show minor variations among the 12 samples, indicating the major contributor is from local grasses with a uniform C3 photosynthetic pathway. In contrast, variations in δD n-alkanes values of the four long-chain n-alkanes are relatively large, with the more abundant homologs generally showing more negative δD n-alkanes values and less variation. However, variation of <30-among weighted averaged δD n-alkanes values of the four long-chain n-alkanes is not only less than that among δD n-alkanes values for different modern terrestrial C3 grasses from the specific locations, but also less than the literature values of δD n-alkanes of long-chain n-alkanes for single species over different seasons. Thus, because the sources of long-chain n-alkanes in surface soils and sediments are similarly from multiple individual plants, our results are significant in confirming that paleoclimatic, paleoenvironmental and paleohydrological information can be interpreted more accurately from δD n-alkanes values of long-chain n-alkanes from sediments, particularly terrestrial sediments with organic matter derived from in-situ plants.