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 F.[1,2];Chen J.[1,3];Jia G.[4];Jin H.[3];Xu J.[5];Yang Z.[3];Zhuang Y.[3];Liu X.[3];Zhang H.[3]

机构：[1]State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;[2]College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang 524088, China;[3]Laboratory of Marine Ecosystem and Biogeochemistry of State Oceanic Administration, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;[4]Key Laboratory of Marginal Sea Geology of Chinese Academy of Sciences, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;[5]Division of Environment, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, Hong Kong

年份：2013

卷号：32

期号：4

起止页码：11

外文期刊名：Acta Oceanologica Sinica

收录：Scopus(收录号：2-s2.0-84880523867)

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 GCMAC1103.

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, δ 15N and δ 18O 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 ～1:1 enrichment of δ 15N and δ 18O in the three transects, while spatial difference in nitrification was reflected by deviations of δ 15N and δ 18O 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. ? 2013 The Chinese Society of Oceanography and Springer-Verlag Berlin Heidelberg.