NDLI: Compound-specific hydrogen isotopes of long-chain n-alkanes extracted from topsoil under a grassland ecosystem in northern China

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Compound-specific hydrogen isotopes of long-chain n-alkanes extracted from topsoil under a grassland ecosystem in northern China

Content Provider	Springer Nature Link
Author	Rao, ZhiGuo Zhu, ZhaoYu Jia, GuoDong Zhang, Xiao Wang, SuPing
Copyright Year	2011
Abstract	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 $^{13}$C$_{ n-alkanes}$) and H isotopes of long-chain n-alkanes, as well as C isotopes of TOC (δ $^{13}$C$_{TOC}$), were analyzed. Both δ $^{13}$C$_{TOC}$ and δ $^{13}$C$_{ n-alkanes}$ values from four representative dominant long-chain n-alkanes (n-C$_{27}$, n-C$_{29}$, n-C$_{31}$, n-C$_{33}$) 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 C$_{3}$ 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.
Starting Page	1902
Ending Page	1911
Page Count	10
File Format	PDF
ISSN	16747313
Journal	Science in China Series D: Earth Sciences
Volume Number	54
Issue Number	12
e-ISSN	18691897
Language	English
Publisher	SP Science China Press
Publisher Date	2011-08-25
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	C$_{3}$ grassland surface soil long-chain n-alkanes compound-specific hydrogen isotope Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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