深圳湾及邻近沿岸沉积物中碳、氮和磷的分布

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摘要

依据1998~2014年每年2个航次取得的资料，分析和研究了深圳湾和珠江口东南沿岸表层沉积物中生物地球化学要素[包括总碳（TC）、总有机碳（TOC）、总氮（TN）和总磷（TP）]的时空分布，并依据C：N原子比探讨沉积物中有机质的来源.结果表明，TC、TOC、TN和TP含量在深圳湾中分别为（13200±3600）、（12200±3200）、（910±352）和（594±288） mg/kg，而在珠江口东南沿岸中分别为（12000±3900）、（8700±2300）、（601±259）和（334±119） mg/kg.1998~2014年研究海区沉积物中TC和TN含量的年际变化均呈上升趋势，而TOC含量则呈下降趋势.研究期间TP含量在深圳湾中呈下降趋势，而在珠江口东南沿岸中呈上升趋势.深圳湾和珠江口东南沿岸中TOC：TN原子比分别约为17.7和19.5，研究期间均呈下降趋势.研究海区中表层沉积有机质（SOM）是陆生和水生2种来源的混合输入，在深圳湾中以水生源为主，而在珠江口东南沿岸中以陆生源为主.1998~2014年研究海区中表层SOM从以陆生源为主逐渐转变为以水生源为主.

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	许春玲
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关键词 ：深圳湾, 珠江口, 表层沉积物, 生物地球化学要素, C:N原子比, 有机质来源

Abstract：

Data obtained biannually from 1998 to 2014 were used for analyzing and studying temporal and spatial distributions of the biogeochemical parameters,including the total carbon (TC),total organic carbon (TOC),total nitrogen (TN) and total phosphorus (TP),in the surface sediments of the Shenzhen Bay and coastal southeastern Pearl River Estuary.Also sources of the organic matter in the sediments were identified on the basis of the C:N atomic ratio.The results showed that the TC,TOC,TN and TP concentrations were (13200±3600),(12200±3200),(910±352) and (594±288) mg/kg respectively in the bay,and were (12000±3900),(8700±2300),(601±259) and (334±119) mg/kg respectively in the estuary.Both the TC and TN concentrations had witnessed an increase trend,while the TOC concentration had witnessed a decrease one in the sediments studied from 1998 to 2014.However,the TP concentration changed with a decrease trend in the bay and an increase one in the estuary during the period studied.The TOC:TN atomic ratio was about 17.7 in the bay and 19.5 in the estuary,and had undergone a decrease trend in both the bay and estuary from 1998 to 2014.The sedimentary organic matter (SOM) was a mixture from both of the terrestrial and aquatic sources,dominating with the aquatic one in the bay and with the terrestrial one in the estuary.A shift from the terrestrial dominance to the aquatic one of the surface SOM sources had been found in the area studied from 1998 to 2014.

Key words： Shenzhen Bay Pearl River Estuary surface sediments biogeochemical parameters C:N atomic ratio sources of organic matter

收稿日期: 2016-10-17

PACS:	X55
	X142

基金资助:

国家"973"项目（2013CB956101）；国家海洋局南海分局海洋科学技术局长基金资助项目（1523；1524）

通讯作者: 李绪录,高级工程师,benlixulu@sohu.com E-mail: benlixulu@sohu.com

作者简介: 许春玲(1987-),女,安徽铜陵人,硕士,主要从事海洋化学研究.发表论文3篇.

引用本文:

许春玲, 李绪录, 林梵. 深圳湾及邻近沿岸沉积物中碳、氮和磷的分布[J]. 中国环境科学, 2017, 37(7): 2691-2698. XU Chun-ling, LI Xu-lu, LIN Fan. Distributions of carbon,nitrogen and phosphorus in the surface sediments of the Shenzhen Bay and adjacent coastal area. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(7): 2691-2698.

链接本文:

http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2017/V37/I7/2691

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