南沙群岛西部海域两柱状沉积物中碳和氮的分布和来源特征及埋藏通量估算  

Distribution and source characteristics of carbon and nitrogen and their burial fluxes in two core sediments from western Nansha Islands sea area

作　　者：高学鲁[1,2,3] 陈绍勇[1] 马福俊[1] 党爱翠[1] 龙爱民[1] 

机构地区：[1]中国科学院南海海洋研究所热带海洋环境动力学重点实验室,广东广州510301 [2]中国科学院烟台海岸带可持续发展研究所,山东烟台264003 [3]国家海洋局海洋生态系统与生物地球化学重点实验室,国家海洋局第二海洋研究所,浙江杭州310012

出　　处：《热带海洋学报》2008年第3期38-44,共7页Journal of Tropical Oceanography

基　　金：国家科技支撑计划南沙专项(2006BAB19B03);中国科学院知识创新方向项目(KZCX2-YW-215);国家海洋局海洋生态系统与生物地球化学重点实验室开放研究基金资助项目(LMEB200606);大洋协会项目(DYXM115-02-1-08)

摘　　要：对位于南沙群岛海域西部近大陆架-残留沉积区(NS01站)和深海沉积区(NS02站)的2个沉积物柱状样进行了研究,测定了它们的粒度组成、CaCO3含量、总有机碳含量(TOC)、总碳含量(TC)、总有机物含量(TOM)和总氮含量(TN),估算了它们的埋藏通量及陆/海源TOC和TN的相对含量。结果表明,该海域沉积物主要是粒径小于63μm的细粒度组分,粒度组成随深度的变化很小。沉积物粒度不是控制CaCO3含量、TOC、TC、TOM、TN和TOC/TN垂向变化的主要因素。NS01站CaCO3含量、TOC、TC、TOM和TN的含量及埋藏通量均低于NS02站。NS01站TOC/TN随深度的变化主要受控于TN的变化,而NS02站则主要受控于TOC的变化。2个研究站位的TOC和TN均以海洋自生为主,NS01站沉积物中海洋自生TOC和TN的平均值分别为53.2%和81.4%,NS02站沉积物中海洋自生TOC和TN的平均值分别为64.5%和87.7%。Two sediment cores collected from the western Nansha Islands sea area were analyzed. The result shows that fine-grained sediments with grain size diameter smaller than 63μm are the dominant fraction. The grain size compositions vary little with depth. The sediment grain size is not the main factor that controls the vertical distributions of CaCO3, total organic carbon （TOC）, total carbon （TC）, total organic matter （TOM）, total nitrogen （TN） and TOC/TN. Compared with station NS02 which lies in the abyssal sediment area, station NS01 which lies in the near continental shelf relict sediment area has lower contents and burial fluxes of CaCO3, TOC, TC, TOM and TN. At station NS01, the change of TOC/TN with depth is mainly controlled by TN change; however, at station NS02, it is mainly controlled by TOC variations. At both two stations, TOC and TN are mainly marine autogenic. At station NS01 the average marine autogenic TOC and TN are 53.2% and 81.4% respectively; at station NS02, the corresponding values are 64. 5 % and 87.7 % respectively.

关 键 词：南沙群岛西部海域 柱状沉积物 碳和氮 分布特征 埋藏通量 

分 类 号：P736.21[天文地球—海洋地质]