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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 (和尚洞) in Qingjiang (清江), Hubei (湖北) Province. The distribution of n-alkanes is mainly from C_ 25 to C_ 33 in carbon number, with a maximum at C_ 31 . 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/l (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.
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. The distribution of n-alkanes is mainly from C_ 25 to C_ 33 in carbon number, with a maximum at C_ 31. They have a strong odd-over-even carbon number (Caves) in Qingjiang (清江), Hubei The lipid parameters include CPI_h (carbon preference index), R_h / l (ratio of lower-to-higher-molecular-weight homologues) and ACL (average chain length), show comparing 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.