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首页> 外文期刊>Marine Chemistry >Distribution and sources of organic carbon, nitrogen and their isotopes in sediments of the subtropical Pearl River estuary and adjacent shelf, Southern China
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Distribution and sources of organic carbon, nitrogen and their isotopes in sediments of the subtropical Pearl River estuary and adjacent shelf, Southern China

机译：中国南方亚热带珠江口及其邻近陆架沉积物中有机碳，氮及其同位素的分布和来源

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摘要

The isotopic composition (δ~(13)C and δ~(15)N) and organic carbon (OC) and total nitrogen (TN, organic plus inorganic) content of 37 carbonate-free surficial sediments of the subtropical Pearl River estuary and the adjacent shelf of South China Sea (SCS) was determined. The δ~(13)C values indicate that the sediment organic material is a mixture from two sources, terrestrial and marine. Several of the sediments have extremely low ( < 4) OC/TN ratios, which could be due to low OC contents and/or to a significant fraction of the TN present as inorganic nitrogen adsorbed on clays. In general, the spatial patterns of OC, TN, δ~(13)C and δ~(15)N are similar. Values are low at the river mouth and on the western coast, suggesting proportionally greater accumulation of terrestrial particulate organic matter relative to marine phytodetritus, which is limited by low productivity in the turbid plume of the Pearl River. Algal-derived organic carbon (al-OC) content is estimated to be low ( ≤ 0.06%) at the river mouth and higher (up to 0.57%) on the adjacent inner shelf based on a mixing model of end members.
机译：亚热带珠江口及珠江三角洲37个无碳酸盐沉积物的同位素组成（δ〜（13）C和δ〜（15）N）和有机碳（OC）和总氮（TN，有机加无机）含量。确定了南海（SCS）的相邻海床。 δ〜（13）C值表明沉积物有机物质是来自陆地和海洋两种来源的混合物。一些沉积物的OC / TN比极低（<4），这可能是由于OC含量低和/或作为吸附在粘土上的无机氮而存在的TN的很大一部分所致。通常，OC，TN，δ〜（13）C和δ〜（15）N的空间模式相似。在河口和西海岸的数值较低，这表明相对于海洋植物碎屑而言，陆生颗粒有机物的积累成比例地增加，这受到珠江混浊羽流生产率低下的限制。根据端部成员的混合模型，藻类来源的有机碳（al-OC）含量在河口处估计较低（≤0.06％），而在相邻的内架处较高（高达0.57％）。

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