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首页> 外文期刊>Estuarine Coastal and Shelf Science >Lipid biomarkers and organic matter carbon isotopes in estuarine sediments as proxies for evaluating seawater intrusion
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Lipid biomarkers and organic matter carbon isotopes in estuarine sediments as proxies for evaluating seawater intrusion

机译：河口沉积物中的脂质生物标志物和有机物碳同位素作为评估海水入侵的代理

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摘要

Coastal wetlands and estuarine sediments are characteristics of tide-dominated environments and retain a record of seawater intrusion and possibly sea-level changes. A variety of methods including the C/N ratio and delta C-13 of bulk organic matter in the sediment have been employed in estuarine studies, but they are generally non-specific indicators. Here we report using lipid biomarkers to evaluate the extent of seawater intrusion based on an estuary in eastern China, Xinyanggang. Along the river from the estuary mouth upstream to the freshwater head, the vegetation shifts quickly from salt-tolerant Spartina (C-4) to the less tolerant reed Phragmites (C-3), both of which have distinguished delta C-13 values and biomarker distribution. The delta C-13 values of particulate organic matter (POM) and surface sediment decreased from the estuary mouth upstream, indicating the reduced contributions from Spartina and marine phytoplankton to the POM and surface sediment and increased inputs from Phragmites. The C-32/C-30 alkanol and cholesterol/sitosterol ratio decreased in the surface sediments, faithfully recording the variations in the contributions from Spartina and Phragmites. The combination of biomarker distribution and organic matter delta C-13 in the sediments can be used as indicators for sea water intrusion into the estuary/river. (C) 2015 Elsevier Ltd. All rights reserved.
机译：沿海湿地和河口沉积物是潮汐主导环境的特征，并保留了海水入侵和可能的海平面变化的记录。河口研究已采用多种方法，包括沉积物中大部分有机物的C / N比和C-13增量，但它们通常是非特异性指标。在这里，我们报告使用脂质生物标记物，根据中国东部信阳港的一个河口来评估海水入侵的程度。沿着从河口上游到淡水头的河流，植被从耐盐的斯巴蒂娜（C-4）迅速转移到耐性较差的芦苇芦苇（C-3），两者的δC-13值都很高，生物标志物分布。从上游的河口口，颗粒有机物（POM）和表面沉积物的δC-13值降低，这表明Spartina和海洋浮游植物对POM和表面沉积物的贡献减少，芦苇的投入增加。表层沉积物中C-32 / C-30链烷醇和胆固醇/谷固醇的比例降低，如实记录了斯巴迪娜和芦苇的贡献变化。沉积物中生物标志物分布和有机物δC-13的组合可以用作海水侵入河口/河道的指示剂。 （C）2015 Elsevier Ltd.保留所有权利。

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