Sources and distribution of sedimentary organic matter in the Beibu Gulf, China: Application of multiple proxies
Sources and distribution of sedimentary organic matter in the Beibu Gulf, China: Application of multiple proxies
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中国北部湾沉积有机质的来源和分布：多重代理的应用
DOI：
10.1016/j.marchem.2018.09.006
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发表时间：
2018-10
期刊：
影响因子：
3
通讯作者：
Deng Wenfeng
中科院分区：
文献类型：
--
作者：
Liao Weisen;Hu Jianfang;Zhou Haoda;Hu Jianhua;Peng Ping'an;Deng Wenfeng
采用地球化学和生物标志物相结合的方法研究了中国南方亚热带河口北部湾沉积有机质的来源及其空间分布。测定了北部湾表层沉积物中总有机碳（TOC）和总氮（TN）含量、甘油二烷基甘油四醚（GDGTs）浓度以及沉积物OM （δ 13corgan和δ15N）同位素组成。总体有机质参数（TOC、TN、C/N、δ13Corg和δ15N）的空间分布表明，从茅尾海到外钦州湾，从支流到外钦州湾，陆相有机质总体呈下降趋势。从茅尾海到钦州湾，从河流到外湾，BIT（分支/类异戊二烯四醚）指数也呈下降趋势，表明土壤有机质主要由河流输送到海湾。这些体积参数的空间格局表明，陆源OC仅限于海岸及其邻近地区。茅尾海沿岸较高的GDGT-0/Crenarchaeol比值和增大的δ15N值表明北部湾为人为氮源。研究结果表明，在人类活动日益频繁的背景下，多代理方法对于全面了解和量化北部湾陆地和海洋OC组分以及生物地球化学过程的相对贡献是非常重要的。
Geochemical and biomarker methods were combined to investigate the sources of sedimentary organic matter (OM) and their spatial distribution in the Beibu Gulf, a subtropical estuary in southern China. We measured the total organic carbon (TOC) and total nitrogen (TN) content, the glycerol dialkyl glycerol tetraethers (GDGTs) concentration, as well as the isotopic composition of sedimentary OM (δ13Corgand δ15N) in surface sediments collected from the Beibu Gulf. The spatial distribution of the bulk organic parameters (TOC, TN, C/N ratio, δ13Corg, and δ15N) revealed a generally decreasing trend in terrestrial OM from the Maowei Sea to the outer Qinzhou Bay, and from the tributary rivers to the outer bay. The BIT (branched/isoprenoid tetraether) indices also decreased seaward from the Maowei Sea to the Qinzhou Bay, and from rivers to the outer bay, showing that soil OM was mainly delivered to the bay by rivers. The spatial patterns of these bulk parameters suggest that the terrigenous OC is constrained to the coast and adjacent regions. The relatively high GDGT-0/Crenarchaeol ratios and increasing δ15N values along the coast of the Maowei Sea indicate the anthropogenic nitrogen in the Beibu Gulf. Our results show how important a multiproxy approach can be to fully understand and quantify the relative contributions of terrestrial and marine OC components and the biogeochemical processes in the Beibu Gulf, especially in the context of growing anthropogenic activities.
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影响因子：
2.7
作者：
P. Abreu;C. Costa;C. Bemvenuti;C. Odebrecht;W. Granéli;A. Anesio
通讯作者：
P. Abreu;C. Costa;C. Bemvenuti;C. Odebrecht;W. Granéli;A. Anesio
影响因子：
3
作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
3.4
作者：
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通讯作者：
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影响因子：
3
作者：
Meyers, PA
通讯作者：
Meyers, PA