文献类型：期刊文献

英文题名：Origin of the Particulate Organic Matter in a Monsoon-Controlled Bay in Southern China

作者：Li, Jiacheng[1,2];Chen, Fajin[2];Zhang, Shuwen[1];Huang, Chao[2];Chen, Chunqing[2];Zhou, Fengxia[2];Wu, Junhui[2];Jin, Guangzhe[2];Zhu, Qingmei[2]

机构：[1]Shantou Univ, Inst Marine Sci, Shantou 515063, Peoples R China;[2]Guangdong Ocean Univ, Coll Ocean & Meteorol, Zhanjiang 524088, Peoples R China

年份：2021

卷号：9

期号：5

外文期刊名：JOURNAL OF MARINE SCIENCE AND ENGINEERING

收录：SCI-EXPANDED(收录号：WOS:000662467700001)、、Scopus(收录号：2-s2.0-85106894371)、WOS

基金：This work was supported by the Scientific Research Start-Up Foundation of Shantou University (NTF20006), the National Natural Science Foundation of China (U1901213), the Guangdong Natural Science Foundation of China (2016A030312004), the Foundation for Young Talents in the General Colleges and Universities of Guangdong, China (2019KQNCX044), the Project of Enhancing School with Innovation of Guangdong Ocean University (GDOU2016050260 and 230419097), and the Program for Scientific Research Start-Up Funds of Guangdong Ocean University (R19007).

语种：英文

外文关键词：particulate organic matter; stable isotopes; C/N ratio; isotope mixing model; Zhanjiang Bay

外文摘要：In this study, the isotopic composition (delta C-13 and delta N-15), total organic carbon content, total nitrogen content, and C/N ratios of suspended particulate organic matter (POM) in Zhanjiang Bay, which is a semi-enclosed bay with concentrated artificial activities in Southern China, were analyzed in order to investigate the seasonal variations in the principal POM sources in the monsoon region. In summer, the delta C-13 and delta N-15 values showed a weak correlation with the chlorophyll a (Chl a), suggesting that terrigenous sources were dominant. However, in winter, the particulate organic carbon and particulate nitrogen values were correlated with the Chl a in the middle bay and bay mouth. Moreover, the delta C-13 values showed a significant correlation with Chl a during the winter, indicating that the contribution of the in situ phytoplankton was relatively important and was affected by the monsoon in winter. Compared with the corresponding delta C-13 values, the delta N-15 values exhibited a complex spatial distribution. By using a Bayesian mixing model, in the upper bay, the source of POM was mainly from marine organic matter (49%) in summer, and almost an equilibrated contribution of all sources in winter. In the middle bay and bay mouth, the POM contribution mainly originated from marine organic matter (53%) during the winter. In contrast, the POM source was mainly soil organic matter (63%) in summer, suggesting that the POM was sourced from the runoff from the upstream basin. Our results suggest that the seasonal shifts of the source of POM should be taken into account when estimating C or N mass balance in the monsoon-controlled bay.