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

热带海洋学报 ›› 2011, Vol. 30 ›› Issue (2): 94-101.doi: 10.11978/j.issn.1009-5470.2011.02.094cstr: 32234.14.j.issn.1009-5470.2011.02.094

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

孙蕴婕, 吴莹, 张经

华东师范大学河口海岸国家重点实验室, 上海 200062

收稿日期:2010-08-18 修回日期:2010-12-03 出版日期:2011-05-06 发布日期:2011-05-04
通讯作者: 吴莹教授。E-mail: wuying@sklec.ecnu.edu.cn
作者简介:孙蕴婕(1985—), 女, 上海市人, 在读硕士研究生, 从事海洋有机地球化学研究。E-mail: sunyunjie101@126.com
基金资助:
国家自然科学基金项目(40721004、40776047、40830850); 科技部中德合作项目(2007DFB20380)

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

SUN Yun-jie, WU Ying, ZHANG Jing

State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China

Received:2010-08-18 Revised:2010-12-03 Online:2011-05-06 Published:2011-05-04
Contact: 吴莹教授。E-mail: wuying@sklec.ecnu.edu.cn
About author:孙蕴婕(1985—), 女, 上海市人, 在读硕士研究生, 从事海洋有机地球化学研究。E-mail: sunyunjie101@126.com
Supported by:
国家自然科学基金项目(40721004、40776047、40830850); 科技部中德合作项目(2007DFB20380)

摘要/Abstract

摘要：

对海南岛红树林柱样中有机生物标志物等生物地球化学参数进行了初步研究。结果显示红树林中有机碳(OC)与总氮(TN)比值范围为5.35—7.47, 碳稳定同位素(δ13C)值范围为-25‰—-22.9‰。脂肪酸与正构烷烃浓度分布范围分别为7.8—21.8µg•g-1 (干重) 和3.2—25µg•g-1 (干重)。在表层沉积物中, 红树林植物、细菌与浮游生物的脂肪酸生物标志物各占总脂肪酸的25.4%、12.9%和7.5%, 结合较低的OC/TN比值和较高的δ13C值, 表征了当地微生物和外源浮游植物的有机质贡献。各类脂肪酸在柱样中表现出不同的降解特征: 多不饱和脂肪酸(PUFAs)优先被降解, 而长链脂肪酸(LCFAs)则较为稳定, 没有明显的降解。碳优势指数(CPI)和平均碳链长度(ACL)显示, 埋藏深度越深, 有机物的生物化学改造程度越大。

关键词: 生物标志物, 正构烷烃, 脂肪酸, 降解, 红树林, 海南岛

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

孙蕴婕,吴莹,张经. 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[J]. 热带海洋学报, 2011, 30(2): 94-101.

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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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

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

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