| Nitrate δ15N and δ18O evidence for active biological transformation in the Changjiang Estuary and the adjacent East China Sea |
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| 作者姓名： | CHEN Fajin CHEN Jianfang JIA Guodong JIN Haiyan XU Jie YANG Zhi ZHUANG Yanpei LIU Xizhen ZHANG Haisheng |
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| 作者单位： | State Key Laboratory of Satellite Ocean EnvironmentDynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;College of Ocean andMeteorology, Guangdong Ocean University, Zhanjiang 524088, China;State Key Laboratory of Satellite Ocean EnvironmentDynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Laboratory ofMarine Ecosystemand Biogeochemistry of State Oceanic Administration, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Key Laboratory ofMarginal Sea Geology of Chinese Academy of Sciences, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;Laboratory ofMarine Ecosystemand Biogeochemistry of State Oceanic Administration, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Division of Environment, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China;Laboratory ofMarine Ecosystemand Biogeochemistry of State Oceanic Administration, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Laboratory ofMarine Ecosystemand Biogeochemistry of State Oceanic Administration, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Laboratory ofMarine Ecosystemand Biogeochemistry of State Oceanic Administration, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Laboratory ofMarine Ecosystemand Biogeochemistry of State Oceanic Administration, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China |
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| 基金项目： | 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. |
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| 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, δ15N and δ18O 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 δ15N and δ18O in the three transects, while spatial difference in nitrification was reflected by deviations of δ15 N and δ18O 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.
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| 关 键 词： | Changjiang Estuary nitrate nitrogen isotope oxygen isotope |
| 收稿时间： | 2011/11/15 0:00:00 |
| 修稿时间： | 2012/7/12 0:00:00 |
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