深圳湾及邻近沿岸沉积物中碳、氮和磷的分布  

Distributions of carbon, nitrogen and phosphorus in the surface sediments of the Shenzhen Bay and adjacent coastal area

作　　者：许春玲[1] 李绪录[1] 林梵[1] XU Chun-ling;LI Xu-lu;LIN Fan(South China Sea Marine Survey and Technology Center, State Oceanic Administration, Guangzhou 510300, China)

机构地区：[1]国家海洋局南海调查技术中心,广东广州510300

出　　处：《中国环境科学》2017年第7期2691-2698,共8页China Environmental Science

基　　金：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)

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.Data obtained biannually from1998to2014were 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 from1998to2014.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 about17.7in the bay and19.5in the estuary,and had undergone a decrease trend in both the bay and estuary from1998to2014.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 from1998to2014.

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 

分 类 号：X55[环境科学与工程—环境工程] X142