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Acyclic Alkanes in the Cave in Qingjiang, Soil over Heshang Hubei Province
Authors:Pu Yang;Huang JunHua;Huang XianYu;Cui JingWei;Hu ChaoChong
Institution:1. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China;2. Laboratory of Biogeology and Environmental Geology, Ministry of Education, China University of Geosciences, Wuhan 430074, China;1. College of Forestry, Jiangxi Agricultural University, Nanchang 330045, China;2. College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China;3. Department of Biosciences, Rice University, Houston, TX 77005, USA;1. Department of Medical Imaging, Jinling Hospital, Clinical School of Medical College, Nanjing University, Nanjing, Jiangsu 210002, China;1. Linze Inland River Basin Research Station, Chinese Ecosystem Research Network, Key Laboratory of Eco-hydrology of Inland River Basin, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;2. Key Laboratory of Eco-hydrology of Inland River Basin, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;3. Key Laboratory of Desert and Desertification, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;4. University of Chinese Academy of Sciences, Beijing 100049, China
Abstract: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 (
></figure>) in Qingjiang (<figure class=></figure>), Hubei (<figure class=></figure>) Province. The distribution of <em>n</em>-alkanes is mainly from C<sub>25</sub> to C<sub>33</sub> in carbon number, with a maximum at C<sub>31</sub>. They have a strong odd-over-even carbon number predominance. These characteristics represent an input mainly from higher plants. The lipid parameters, including CPI<sub>h</sub> (carbon preference index), <em>R</em><sub>h/1</sub> (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.</td>
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Keywords:biomarker  modern soil  n-alkanes  vegetation  cyanobacteria  
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