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Comparison of the carbon isotope composition of total organic carbon and long-chain n-alkanes from surface soils in eastern China and their significance

查看全文 作　　者：RAO [1,2,3]ZhiGuo;JIA [1]GuoDong;ZHU [2]ZhaoYu;WU [2]Yi;ZHANG [3]JiaWu 高影响力作者 机构地区：[1]State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;[2]Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;[3]Key Laboratory of Western China's Environment Systems, Ministry of Education, Lanzhou University, Lanzhou 730000, China高影响力机构 出　　处：《Chinese Science Bulletin》索引2008年第53卷第24期,共7页高影响力期刊 基　　金：Supported by the Knowledge Innovation Program of Chinese Academy of Sciences (Grant No.KZCX3-SW-152);National Natural Science Foundation of China (Grant No.40331009);the Research Foundation of the State Key Laboratory of Organic Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences (Grant No.OGL-200604);the NSFC National Innovative Research Team Project (Grant No.40721061) 摘　　要：Surface soil samples collected over a high spatial resolution in eastern China were analyzed for carbon isotope composition(δ 13C) of total organic carbon(TOC) and higher plant-derived long-chain n-alkanes,with the latter reported as weighted mean values.The two sets of δ 13C values are significantly correlated and show similar trends in spatial variation.The spatial distribution of δ 13C shows less negative values in the mid-latitudes between 31°N and 40°N and more negative ones at higher and lower latitudes.This is consistent with previously reported carbon isotope data from surface soil phytoliths in the same region and suggests that the mid-latitude area provides relatively favorable growing conditions for C4 plants.Furthermore,δ 13C values of both TOC and long-chain n-alkanes from 12 surface soil samples collected from a small grassland in north China displayed similar carbon isotope values and the difference between paired δ 13C of a soil samples remains relatively constant.Our data demonstrate that in eastern China,soil δ 13C composition of both TOC and long-chain n-alkanes is effective indicators of C3/C4 ratios of the prevailing vegetation.This work suggests that -22‰ and -32‰ are good estimated end members for the weighted mean δ 13C values of long-chain n-alkanes(C27,C29 and C31 n-alkanes) from soils under dominant C4 or C3 vegetation,allowing us to reconstruct paleovegetation trends. 关 键 词：植物 总有机碳 碳同位素 表面土壤
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