长江口海域悬浮颗粒有机物的稳定氮同位素季节分布与关键生物地球化学过程

于海燕; 俞志明; 宋秀贤; 刘丽丽; 曹西华; 袁涌铨

长江口海域悬浮颗粒有机物的稳定氮同位素季节分布与关键生物地球化学过程

1.
中国科学院海洋研究所海洋生态与环境科学重点实验室,山东青岛 266071;中国科学院大学,北京 100039
2.
中国科学院海洋研究所海洋生态与环境科学重点实验室,山东青岛 266071

基金项目: 国家自然科学基金项目(41276116)；国家基金委创新研究群体科学基金资助项目(41121064)；国家基础研究规划973项目(2010CB428706)。

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出版历程
- 收稿日期: 2012-12-16
- 修回日期: 2013-03-12

Seasonal distribution of the isotopic composition of suspended particulate nitrogen in the Changjiang River estuary and its biogeochemistry implications

1.
Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;University of Chinese Academy of Sciences,Beijing 100039, China
2.
Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China

摘要

摘要: 对2010年2、5、8、11月份长江口海域水体中的悬浮颗粒物进行稳定氮同位素分析。根据不同季节、不同区域内悬浮颗粒有机物的稳定氮同位素组成(δ¹⁵Np)值的变化研究水体中氮的迁移、转化等生物地球化学过程，揭示其环境行为，从而对该海域的氮循环机制进行探索。研究发现：长江口海域悬浮颗粒物的稳定氮同位素组成具有较宽的分布范围，δ¹⁵Np值分布范围为-1.1‰～8.6‰，具有明显的时空分布特点，反映了不同程度的陆源输入和氮的生物地球化学过程的影响。其中，2月份生物反应较弱，δ¹⁵Np分布体现了陆源和海源的混合特征;5月和11月份上层水体δ¹⁵Np随叶绿素a升高而降低，指示了生物的同化吸收作用;8月和11月δ¹⁵Np和总溶解无机氮呈现极显著正相关关系，说明该海域发生了氮的矿化再生。
- 氮稳定同位素 /
- 同化 /
- 矿化 /
- 硝化
Abstract: The isotopic composition of suspended particulate matters (δ¹⁵Np) in surface water was studied during February, May, August and November of 2010 in the Changjiang River estuary. Based on the variations of δ¹⁵Np in different seasons and regions, the biogeochemical processing of nitrogen transformation was studied and its environmental implications were also revealed. The results showed that δ¹⁵Np of SPM was in a wide range of -1.1‰-8.6‰, varying with seasons and geographic regions, which reflected influences of riverine input and biogeochemical processes. In February, the variation of δ¹⁵Np reflected the mixing between riverine and marine nitrogen; in May and November, δ¹⁵Np decreased with increased Chl a in the surface waters, which indicated assimilation; in August and November, significant positive relationships were found between δ¹⁵Np and DIN, which indicated remineralizaion and nitrification.
- nitrogen isotope /
- assimilation /
- mineralization /
- nitrification

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参考文献(32)

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