Nitrogen loss process in hypoxic seawater based on the culture experiment
Nitrogen loss process in hypoxic seawater based on the culture experiment
复制标题
基于培养实验的低氧海水中氮素损失过程
DOI：
10.1016/j.marpolbul.2020.110912
复制
发表时间：
2020
影响因子：
5.8
通讯作者：
Xuegang Li
中科院分区：
文献类型：
--
作者：
Dongfan Tian;Yueqi Wang;Jianwei Xing;Qiqi Sun;Jinming Song;Xuegang Li
最小含氧区和其他低氧海域被认为是海洋氮流失的主要区域。通过实验室模拟培养，研究了不同溶解氧浓度海水中溶解无机氮（DIN）的主要反应、速率和比例，旨在阐明低氧海水中氮的损失过程。结果表明，缺氧水体中无机氮的变化可分为三个阶段。在第一阶段，主要反应是异化硝酸盐还原为铵（DNRA）和反硝化。第二阶段以厌氧氨氧化和反硝化为主。在最后阶段，厌氧氨氧化是最重要的氮素损失反应，氮素损失最终与沉积物矿化输入达到相对平衡。根据上一阶段的数据，全球有机开放区的年氮损失量估计为240-260 Tg。
The oxygen minimum zones (OMZs) and other hypoxic seawaters are considered as the main areas of oceanic nitrogen loss. The laboratory simulation culture was conducted to study the main reactions, rates and proportions of dissolved inorganic nitrogen (DIN) in different dissolved oxygen concentrations seawater, with aim of clarifying the process of nitrogen loss in hypoxic seawater. The results showed that the change of DIN in hypoxic water could be divided into three stages. In the first stage, the main reactions were the dissimilatory nitrate reduction to ammonium (DNRA) and denitrification. In the second stage, anammox and denitrification were main reactions. In the last stage, anammox was the most important nitrogen loss reaction; nitrogen loss eventually reached a relative balance with the input from sediment mineralization. Based on the data obtained from the last stage, the annual nitrogen loss could be estimated to be about 240–260 Tg in the global OMZs.