文献类型：期刊文献

英文题名：Carbon and nitrogen isotopic composition of particulate organic matter in the Pearl River Estuary and the adjacent shelf

作者：Huang, Chao[1,2];Chen, Fajin[1,2];Zhang, Shuwen[3];Chen, Chunqing[1,2];Meng, Yafei[1,2];Zhu, Qingmei[1,2];Song, Zhiguang[2]

机构：[1]Guangdong Ocean Univ, Coll Ocean & Meteorol, Zhanjiang 524088, Peoples R China;[2]Guangdong Ocean Univ, Dept Educ Guangdong Prov, Key Lab Climate Resources & Environm Continental, Zhanjiang 524088, Peoples R China;[3]Shantou Univ, Inst Marine Sci, 243 Daxue Rd, Shantou 515063, Peoples R China

年份：2020

卷号：246

外文期刊名：ESTUARINE COASTAL AND SHELF SCIENCE

收录：SCI-EXPANDED(收录号：WOS:000591629600001)、、Scopus(收录号：2-s2.0-85092170655)、WOS

基金：This work was supported by China National Key Research and Development Plan Project (2016YFC1401403); National Natural Science Foundation of China (41476066, U1901213, 41676008); Guangdong Natural Science Foundation of China (2016A030312004; 2020A1515010500); International Science and Technology Cooperation Programme (GASI-IPOVAI-04); and Project of Enhancing School with Innovation of Guangdong Ocean University (GDOU2016050260, 230419097); Marine Science Research Team Project of Guangdong Ocean University (002026002004).

语种：英文

外文关键词：Particulate organic matter; Stable isotope; Isotope ratio; Pearl river estuary; Inner continental shelf

外文摘要：The isotopic composition (delta C-13 and delta N-15), organic carbon and nitrogen contents and C/N ratios of suspended particulate organic matter (POM) collected from the Pearl River Estuary and the adjacent shelf during spring and summer of 2017 were determined to understand the main controlling factors of spatiotemporal distribution and to elucidate the sources of particulate organic matter. Our study revealed considerable spatial variability of these parameters. In summer, delta C-13 in the Pearl River Estuary generally increased seawards, reflecting the increasing contribution of marine organic matter. Domestic sewage and industrial wastewater were responsible for relatively high delta N-15 in the Pearl River Estuary. In spring, delta C-13 on the adjacent shelf generally decreased from land to sea, with elevated delta C-13 occurred at the nearshore stations, suggesting that the eutrophic level, phytoplankton biomass and microbial activity played an important role in determining the sources of POM. Compared with delta C-13, delta N-15 values displayed a complicated spatial distribution. Especially in the bottom water, enriched delta N-15 would be influenced by the degradation and mineralization of suspended matter. Given that isotopic values in summer can be applied in source apportionment, a Bayesian isotope mixing model was used to estimate that in summer the marine and terrestrial organic matter contributed 47% and 38% in the Pearl River Estuary, respectively. The greatest contribution from marine-derived POM (73%) was observed on the adjacent shelf.