长江口及其邻近海域表层沉积物的有机质物源变化分析

发布时间：2018-03-10 00:39

本文选题：长江口及其邻近海域　切入点：TOC　出处：《海洋环境科学》2017年02期 　论文类型：期刊论文

【摘要】：2013~2015年,在长江口-杭州湾及其邻近海区采集表层底质样品112个,进行总有机碳(TOC)、总氮(TN)、有机碳同位素(δ~(13)C)、有机氮同位素(δ~(15)N)和C/N的测定,得到碳氮元素的空间分布特征;并与2006年的数据对比,观察TOC、TN和有机碳δ~(13)C的空间变化。将研究区划分为北部的长江水下三角洲和南部的浙闽内陆架沉积区两部分,结果表明:TOC和TN在北部由陆向海先升高后降低,在浙闽内陆架沉积区表现为向海增加,并在122°~123°E范围内的29°N附近出现高值;有机碳δ~(13)C由陆向海变轻,且在长江水下三角洲比浙闽内陆架沉积区要低,变化较南部慢;2006年和2015年的数据对比表明,近年来,TOC和TN降低,有机碳δ~(13)C变轻,碳氮元素的空间分布更加均一,这些变化在123.5°E以西的长江口地区表现得尤为明显。
[Abstract]:From 2013 to 2015, 112 surface sediment samples were collected from the Changjiang Estuary and Hangzhou Bay and its adjacent sea areas. The spatial distribution characteristics of carbon and nitrogen elements were obtained by the determination of total organic carbon (TOC), total nitrogen (TN), organic carbon isotopes (未 ~ (13) C ~ (+)), organic nitrogen isotopes (未 ~ (15) N) and C / N ratios. Compared with the data of 2006, the spatial variation of TOC TN and organic carbon 未 ~ (13) C are observed. The study area is divided into two parts: the Yangtze River underwater delta in the north and the sedimentary area in the inland shelf of Zhejiang and Fujian in the south. The results showed that TOC and TN increased first and then decreased from the continental to the sea in the north, increased in the sedimentary area of Zhejiang and Fujian inland shelf, and appeared high values near 29 掳N in the range of 122 掳~ 123 掳E, and the organic carbon 未 ~ (13) C became lighter from the continental to the sea. The data of 2006 and 2015 show that in recent years, TOC and TN have decreased, organic carbon 未 ~ (13) ~ (13) C has become lighter, and the spatial distribution of carbon and nitrogen elements is more uniform. These changes are especially evident in the Yangtze Estuary to the west of 123.5 掳E.
【作者单位】：海岸与海岛开发教育部重点实验室南京大学地理与海洋科学学院;国家海岛开发与管理研究中心国家海洋局第二海洋研究所;河口海岸学国家重点实验室华东师范大学河口海岸科学研究院;
【基金】：国家自然科学基金资助项目(41376068) 国家重大科学研究计划项目(2013CB956503)
【分类号】：P736.21

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