Acyclic Alkanes in the Soil over Heshang Cave in Qingjiang, Hubei Province

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• 作者：Yang Pu ; Junhua Huang ; Xianyu Huang ; Jingwei Cui ; Chaoyong Hu
• 关键词：infinite element ; prestressed anchor ; couple ; finite element
• 刊名：Journal of China University of Geosciences
• 出版年：2006
• 出版时间：June 2006
• 年：2006
• 卷：17
• 期：2
• 页码：115-120
• 全文大小：489 K

文摘

The reports that relate to the biomarker's fate and characteristics of the modern soil in the karst area are very lacking. By using gas chromatography-mass spectrometry (GC-MS), a series of biomarkers were identified from the soils collected over Heshang cave () in Qingjiang (), Hubei () Province. The distribution of n-alkanes is mainly from C₂₅ to C₃₃ in carbon number, with a maximum at C₃₁. They have a strong odd-over-even carbon number predominance. These characteristics represent an input mainly from higher plants. The lipid parameters, including CPI_h (carbon preference index), R_h/1 (ratio of lower-to higher-molecular-weight homologues) and ACL (average chain length), show comparable trends with depth, probably reflecting vegetation change and microbial degradation. Series of monomethylalkanes and diploptene are present in the extractable organic matter; they might be derived from soil microbes, cyanobacteria in particular.