首页|Plant type effect overweighs seasonal variation in n-alkanoic acid biomarker on regional Loess Plateau of China
Plant type effect overweighs seasonal variation in n-alkanoic acid biomarker on regional Loess Plateau of China
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The effect of plant type on n-alkane biomarker has been widely studied,but the influence of plant type on n-alkanoic acids(n-FAs)has received less attention.Understanding the effect of the distribution of n-FAs and their hydrogen isotope composition(δ2HFA)is critical for interpreting sedimentary δ2HFA values as proxies of hydroclimate and/or vegetation changes.In this study,we systematically investigated the distribution ofn-FAs and δ2HFA values across seasons on the Chinese Loess Plateau(CLP).Our results showed that there were no significant seasonal differences in n-FAs distribution and δ2HFA values,but there were significant differences in a2HFA values across plant types.The δ2HFA values ranged from-185‰ to-125‰ in dicots(-161％o±28‰),and from-215％o to-170％o in monocots(-196‰±22‰)on the CLP.Isotope fractionation between δ2HFA values and precipitation δ2H(eFA-P)was also 2H-enriched in dicots relative to monocots.At the regional scale of the CLP,δ2HFA values were not correlated with δ2H values of precipitation.However,δ2HFA values from the CLP were similar to expectations from a global comparison,both in terms of their mean values and high variability among plants growing in sites with similar δ2H values of precipitation.As some of this variability in εFA-P is due to the effect of plant type,a careful assessment of the likely sources of waxes in terrestrial sediments is critical when using δ2HFA values for paleohydroclimate reconstruction.
Jinzhao LIU、S.Nemiah LADD、Jiaju ZHAO、Dongna YAN、Ding HE、Yunning CAO、Zhisheng AN
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State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi'an 710061,China
CAS Center for Excellence in Quaternary Science and Global Change,Xi'an 710061,China
Department of Environmental Sciences,University of Basel,Basel 4056,Switzerland
Department of Ocean Science and Center for Ocean Research in Hong Kong and Macao,The Hong Kong University of Science and Technology,Hong Kong 999077,China
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Chinese Academy of SciencesNational Natural Science Foundation of China
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