%0 Journal Article
%T Branched alkanes with quaternary carbon atoms in Chinese soils: Potential environmental implications<br>Branched alkanes with quaternary carbon atoms in Chinese soils： Potential environmental implications
%A BAI Yan
%A FANG Xiaomin
%A WANG Yongli
%A Fabien Kenig
%A CHEN Xiuling
%A WANG Youxiao
%A <br>BAI
%A Yan
%A FANG
%A Xiaomin
%A WANG
%A Yongli
%A Fabien
%A Kenig
%A CHEN
%A Xiuling
%A WANG
%A Youxiao
%J 科学通报(英文版)
%D 2006
%I 
%X Lipids extracted from 26 modern soils collected from different climate zones in China and Mongolia are analyzed using gas chromatographymass spectrometry. These extracts contain pseudohomologous families of 5,5-diethylalkanes (5,5-DEAs), 6,6-diethylalkanes, 5-butyl-5-ethylalkanes and 6-butyl-6-ethylalkanes, which are first detected in modern soils. All these pseudohomologous series display exclusively odd or exclusively even carbon numbers, clearly indicating a biosynthetic origin, and their carbon number distributions generally covary. The distributions of 5,5-DEAs exhibit strong regional variations, correlated with the spatial distributions of climate and vegetation. The lower molecular weight 5,5-DEAs, maximizing at C21 or C23, dominate in southeast and southwest China samples, while the higher molecular weight 5,5-DEAs with a mode at C29 dominate in cold, arid northwest China and Mongolia. The results demonstrate that the distribution of 5,5-DEAs can serve as a new independent proxy, indicating variations in soil ecosystems and climates, just like the well-known proxy of n-C15–21/n-C22–33 ratios.
%K branched alkanes with quaternary carbon atoms
%K BAQCs
%K lipids
%K modern soils
%K environmental implication<br>烷烃
%K BAQCs
%K 脂类
%K 土壤
%K 环境影响
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=01BA20E8BA813E1908F3698710BBFEFEE816345F465FEBA5&cid=96E6E851B5104576C2DD9FC1FBCB69EF&jid=DD6615BC9D2CFCE0B6F945E8D5314523&aid=1A324177EA1631A0C069987385BAF9AE&yid=37904DC365DD7266&vid=987EDA49D8A7A635&iid=9CF7A0430CBB2DFD&sid=CA10C709B736BBEA&eid=7D34DED3F877BD2D&journal_id=1001-6538&journal_name=科学通报(英文版)&referenced_num=0&reference_num=32