文献类型：期刊文献

英文题名：Spatial and Seasonal Variations of Sedimentary Organic Matter in a Subtropical Bay: Implication for Human Interventions

作者：Lu, Xuan[1,2];Zhou, Fengxia[1,2];Chen, Fajin[1,2];Lao, Qibin[3];Zhu, Qingmei[1,2];Meng, Yafei[1,2];Chen, Chunqing[1,2]

机构：[1]Guangdong Ocean Univ, Coll Ocean & Meteorol, Zhanjiang 524088, Peoples R China;[2]Guangdong Ocean Univ, Guangdong Prov Key Lab Coastal Ocean Variat & Dis, Zhanjiang 524088, Peoples R China;[3]State Ocean Adm, Marine Environm Monitoring Ctr Beihai, Beihai 536000, Peoples R China

年份：2020

卷号：17

期号：4

外文期刊名：INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH

收录：SSCI(收录号：WOS:000522388500238)、SCI-EXPANDED(收录号：WOS:000522388500238)、、Scopus(收录号：2-s2.0-85079857598)、WOS

基金：This study was co-supported by the National Key Research and Development Plan (2016YFC1401403); the International Science and Technology Cooperation Project (GASI-IPOVAI-04); the Natural Science Foundation of Guangdong Province (2016A030312004 and 2016A030313754); the Project of Enhancing School with Innovation of Guangdong Ocean University (GDOU2016050260); and the Program for Scientific Research Start-up Funds of Guangdong Ocean University (R17058). We thank the Third Institute of Oceanography, Ministry of Natural Resources for conducting elemental and isotopic analyses.

语种：英文

外文关键词：sedimentary organic matter; stable isotopes; seasonal variations; anthropogenic influence; Zhanjiang Bay

外文摘要：Elemental (total organic carbon (TOC) and total nitrogen (TN)) and stable carbon and nitrogen isotope compositions (delta C-13 and delta N-15, respectively) in the surface sediment of Zhanjiang Bay (ZJB) in spring and summer were measured to study the spatial and seasonal changes of organic matter (OM) and assess the human-induced and environment-induced changes in the area. The OM in the surface sediment of ZJB was a mixture of terrestrial and marine sources, and was dominated by marine OM (54.9% +/- 15.2%). Compared to the central ZJB, the channel and coastal ZJB areas had higher delta C-13 and delta N-15 values, higher TOC and TN concentrations, and lower TOC/TN ratios, indicating higher primary productivity and higher percentages of marine OM in the latter two subregions. Mariculture activities, sewage inputs, and dredging were responsible for these phenomena. Clear seasonal variations in OM were observed in ZJB. The average proportions of terrestrial OM in summer increased by 10.2% in the ZJB channel and 26.0% in the coastal ZJB area compared with those in spring. Heavy rainfall brought a large amount of terrestrial OM into the channel and coastal ZJB areas, leading to the increase of the terrestrial OM fraction in these two subregions in summer. In summary, anthropogenic influences had a significant influence on the spatial and seasonal variations of sedimentary OM in ZJB.