Nitrate δ15N and δ18O evidence for active biological transformation in the Changjiang Estuary and the adjacent East China Sea

CHEN Fajin; CHEN Jianfang; JIA Guodong; JIN Haiyan; XU Jie; YANG Zhi; ZHUANG Yanpei; LIU Xizhen; ZHANG Haisheng

doi:10.1007/s13131-013-0294-4

Nitrate δ¹⁵N and δ¹⁸O evidence for active biological transformation in the Changjiang Estuary and the adjacent East China Sea

doi: 10.1007/s13131-013-0294-4

1.
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
2.
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
3.
Key Laboratory of Marginal Sea Geology of Chinese Academy of Sciences, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
4.
Laboratory of Marine Ecosystem and Biogeochemistry of State Oceanic Administration, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
5.
Division of Environment, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China

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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出版历程
- 收稿日期: 2011-11-15
- 修回日期: 2012-07-12

Nitrate δ¹⁵N and δ¹⁸O evidence for active biological transformation in the Changjiang Estuary and the adjacent East China Sea

1.
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
2.
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
3.
Key Laboratory of Marginal Sea Geology of Chinese Academy of Sciences, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
4.
Laboratory of Marine Ecosystem and Biogeochemistry of State Oceanic Administration, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
5.
Division of Environment, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China

摘要

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.
- ChangjiangEstuary /
- nitrate /
- nitrogenisotope /
- oxygenisotope
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.
- Changjiang Estuary /
- nitrate /
- nitrogen isotope /
- oxygen isotope

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文章访问数: 328
HTML全文浏览量: 37
PDF下载量: 172
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Nitrate δ15N and δ18O evidence for active biological transformation in the Changjiang Estuary and the adjacent East China Sea

doi: 10.1007/s13131-013-0294-4

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Nitrate δ15N and δ18O evidence for active biological transformation in the Changjiang Estuary and the adjacent East China Sea

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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