| CHEN Fajin,CHEN Jianfang,JIA Guodong,JIN Haiyan,XU Jie,YANG Zhi,ZHUANG Yanpei,LIU Xizhen,ZHANG Haisheng. 2013. Nitrate δ15N and δ18O evidence for active biological transformation in the Changjiang Estuary and the adjacent East China Sea. Acta Oceanologica Sinica, 32(4):11－17 |
| Nitrate δ15N and δ18O evidence for active biological transformation in the Changjiang Estuary and the adjacent East China Sea |
| Nitrate δ15N and δ18O evidence for active biological transformation in the Changjiang Estuary and the adjacent East China Sea |
| Received:November 15, 2011 Revised:July 12, 2012 |
| DOI：10.1007/s13131-013-0294-4 |
| Key words:Changjiang Estuary nitrate nitrogen isotope oxygen isotope |
| 中文关键词: Changjiang Estuary nitrate nitrogen isotope oxygen isotope |
| 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. |
| Author Name | Affiliation | E-mail | | CHEN Fajin | State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang 524088, China | jfchen@sio.org.cn | | CHEN Jianfang | State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
Laboratory of Marine Ecosystem and Biogeochemistry of State Oceanic Administration, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | | | JIA Guodong | Key Laboratory of Marginal Sea Geology of Chinese Academy of Sciences, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China | | | JIN Haiyan | Laboratory of Marine Ecosystem and Biogeochemistry of State Oceanic Administration, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | | | XU Jie | Division of Environment, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China | | | YANG Zhi | Laboratory of Marine Ecosystem and Biogeochemistry of State Oceanic Administration, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | | | ZHUANG Yanpei | Laboratory of Marine Ecosystem and Biogeochemistry of State Oceanic Administration, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | | | LIU Xizhen | Laboratory of Marine Ecosystem and Biogeochemistry of State Oceanic Administration, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | | | ZHANG Haisheng | Laboratory of Marine Ecosystem and Biogeochemistry of State Oceanic Administration, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | |
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| Abstract: |
| The Changjiang Estuary has been considered as one of the most polluted estuaries in the world due to high nitrate (NO3-) input, especially in spring and summer. In this study, δ15N and δ18O of NO3-, along with other chemical parameters in this area, were measured in spring to evaluate NO3- 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 NO3- sources in the Changjiang Estuary and the adjacent East China Sea. The isotopic signals show that NO3- 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 δ15N and δ18O from assimilation line. Our results suggest that the input of the Changjiang River Diluted Water promoted NO3- assimilation possibly by stratifying the water column which favored the phytoplankton growth. |
| 中文摘要: |
| The Changjiang Estuary has been considered as one of the most polluted estuaries in the world due to high nitrate (NO3-) input, especially in spring and summer. In this study, δ15N and δ18O of NO3-, along with other chemical parameters in this area, were measured in spring to evaluate NO3- 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 NO3- sources in the Changjiang Estuary and the adjacent East China Sea. The isotopic signals show that NO3- 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 δ15N and δ18O from assimilation line. Our results suggest that the input of the Changjiang River Diluted Water promoted NO3- assimilation possibly by stratifying the water column which favored the phytoplankton growth. |
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