海南八门湾红树林柱状沉积物中有机生物标志物的分布和降解

doi:10.11978/j.issn.1009-5470.2011.02.094

Abstract

Abstract:

A series of organic biomarkers were analyzed, which was from a core sample collected in the mangrove sediment near the Bamen Gulf in Hainan Island to investigate source and degradation of organic matters in the sediment. The percentage of organic carbon (OC%), the percentage of total nitrogen (TN%), OC/TN ratio, δ13C value, and specific biomarkers were determined using the sample. Concentrations of total fatty acids ranged from 7.8 to 21.8 µg•g-1 (dry weight). High portions of bio-source organic matters were derived from micro-organism, with large contributions of bacteria and plankton derived fatty acids (12.93% and 7.45% of total fatty acids, respectively), proved by low C/N ratio (5.35-7.47) and low δ13C value (-25‰ to -22.9‰). Polyunsaturated fatty acids (PUFAs) with high degradation rate were lost fastest during decomposition. Long chain fatty acids (LCFAs) were relatively stable and shown no significant difference during degradation. The carbon preference index(CPI)and the n-alkane average chain length(ACL) indicated organic matter generally became more mature in deeper sediments.

Key words: biomarker, alkane, fatty acid, degradation, mangrove forest, Hainan Island

SUN Yun-jie,WU Ying,ZHANG Jing. Composition and degradation of lipid biomarkers in mangrove forest sediments of Hainan Island, China[J].Journal of Tropical Oceanography, 2011, 30(2): 94-101.

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Composition and degradation of lipid biomarkers in mangrove forest sediments of Hainan Island, China

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