文献类型：期刊文献

英文题名：Nitrate δ ¹⁵N and δ ¹⁸O evidence for active biological transformation in the Changjiang Estuary and the adjacent East China Sea

作者：Chen Fajin[1,2];Chen Jianfang[1,3];Jia Guodong[4];Jin Haiyan[3];Xu Jie[5];Yang Zhi[3];Zhuang Yanpei[3];Liu Xizhen[3];Zhang Haisheng[3]

机构：[1]State Ocean Adm, State Key Lab Satellite Ocean Environm Dynam, Inst Oceanog 2, Hangzhou 310012, Zhejiang, Peoples R China;[2]Guangdong Ocean Univ, Coll Ocean & Meteorol, Zhanjiang 524088, Peoples R China;[3]State Ocean Adm, Lab Marine Ecosyst & Biogeochem, Inst Oceanog 2, Hangzhou 310012, Zhejiang, Peoples R China;[4]Chinese Acad Sci, Key Lab Marginal Sea Geol, Guangzhou Inst Geochem, Guangzhou 510640, Guangdong, Peoples R China;[5]Hong Kong Univ Sci & Technol, Div Environm, Hong Kong, Hong Kong, Peoples R China

年份：2013

卷号：32

期号：4

起止页码：11

外文期刊名：ACTA OCEANOLOGICA SINICA

收录：SCI-EXPANDED(收录号：WOS:000317297100002)、、WOS

基金：Foundation item: The National Basic Research Program of China (973 Program) under contract No. 2010CB428903; the National Natural Science Foundation of China under contract Nos 41006045 and 91128212; National Science and Technology Pillar Program under contract No. 2008BAC42B01; China Postdoctoral Science Foundation under contract No. 20100471690; SIOSOA Project under contract Nos JT0707 and GC-MAC1103.

语种：英文

外文关键词：Changjiang Estuary; nitrate; nitrogen isotope; oxygen isotope

外文摘要：The Changjiang Estuary has been considered as one of the most polluted estuaries in the world due to high nitrate (NO (3) (-) ) input, especially in spring and summer. In this study, delta N-15 and delta O-18 of NO (3) (-) , along with other chemical parameters in this area, were measured in spring to evaluate NO (3) (-) biogeochemical processes. A simple two end-members mixing model was used to examine the relative contribution of the Changjiang River Diluted Water and marine water to NO (3) (-) sources in the Changjiang Estuary and the adjacent East China Sea. The isotopic signals show that NO (3) (-) behaved relatively and conservatively in Transect F and Transect P where assimilation was weak possibly due to vertical mixing, while active assimilation and weak nitrification occurred in Transect D. Spatial difference in assimilation was indicated by the similar to 1:1 enrichment of delta N-15 and delta O-18 in the three transects, while spatial difference in nitrification was reflected by deviations of delta N-15 and delta O-18 from assimilation line. Our results suggest that the input of the Changjiang River Diluted Water promoted NO (3) (-) assimilation possibly by stratifying the water column which favored the phytoplankton growth.