Coupling of denitrification and anaerobic ammonium oxidation with nitrification in sediments of the Yangtze Estuary: Importance and controlling factors
Coupling of denitrification and anaerobic ammonium oxidation with nitrification in sediments of the Yangtze Estuary: Importance and controlling factors
复制标题
长江口沉积物反硝化、厌氧氨氧化与硝化的耦合：重要性及控制因素
DOI：
10.1016/j.ecss.2019.02.043
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发表时间：
2019-05
期刊：
影响因子：
--
通讯作者：
Zhang Zongxiao
中科院分区：
文献类型：
--
作者：
Liu Cheng;Hou Lijun;Liu Min;Zheng Yanling;Yin Guoyu;Han Ping;Dong Hongpo;Gao Juan;Gao Dengzhou;Chang Yongkai;Zhang Zongxiao
反硝化和厌氧氨氧化（anammox）耦合硝化作用是控制水生生态系统脱氮的重要机制。本文采用连续流实验和15n同位素配对技术，沿盐度梯度测定了长江口沉积物中反硝化和厌氧氨氧化的环境速率及其与硝化的耦合关系。总反硝化速率和硝化-反硝化耦合速率分别为0.44 ~ 7.03 μmol N m−2h−1和低于检测限的4.26 μmol N m−2h−1。总厌氧氨氧化率和硝化-厌氧氨氧化耦合率分别在0.09 ~ 1.21 μmol N m−2h−1和0.73 μmol N m−2h−1之间变化。结果表明，底水中NO3−的高有效性以及沉积物中的亚铁和有机碳有利于不耦合脱氮过程，而底水中NO3−的低浓度促进了硝化-氮耦合脱氮过程。在盐度梯度上，硝化-脱氮耦合过程是长江口主要的脱氮途径，其对总脱氮的贡献受采样点NO3−浓度、溶解氧和盐度的影响。总的来说，本研究提高了对河口和海岸环境中硝酸盐转化过程的认识。
Coupling of denitrification and anaerobic ammonium oxidation (anammox) with nitrification is an important mechanism for controlling nitrogen removal from aquatic ecosystems. In this work, we determined ambient rates of denitrification and anammox and their coupling links to nitrification in sediments of the Yangtze Estuary along a salinity gradient, using continuous-flow experiments combined with15N isotope pairing technique. The rates of total denitrification and coupled nitrification-denitrification ranged from 0.44 to 7.03 μmol N m−2h−1and from below the detection limit to 4.26 μmol N m−2h−1, respectively. The rates of total anammox and coupled nitrification-anammox varied from 0.09 to 1.21 μmol N m−2h−1and from below the detection limit to 0.73 μmol N m−2h−1, respectively. It is shown that high availability of NO3−in bottom water as well as ferrous iron and organic carbon in sediments was beneficial to the uncoupled nitrogen removal processes, while low NO3−concentration in bottom water promoted the coupled nitrification-nitrogen removal processes. Along the salinity gradient, the coupled nitrification-nitrogen removal processes were the main nitrogen removal pathway in the Yangtze Estuary, and their contribution to total nitrogen removal was affected by NO3−concentrations, dissolved oxygen and salinity of sampling sites. Overall, this study improves the understanding of nitrate transformation processes in the estuarine and coastal environments.
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影响因子：
2.3
作者：
Hou, Lijun;Liu, Min;Gardner, Wayne S.
通讯作者：
Gardner, Wayne S.
DOI：
10.4319/lom.2005.3.24
发表时间：
2005-01
期刊：
Limnology and Oceanography: Methods
影响因子：
--
作者：
P. Tortell
通讯作者：
P. Tortell
银纳米颗粒对水生环境中硝化和相关一氧化二氮产生的影响
影响因子：
13.6
作者：
Zheng Y;Hou L;Liu M;Newell SE;Yin G;Yu C;Zhang H;Li X;Gao D;Gao J;Wang R;Liu C
通讯作者：
Liu C
影响因子：
2.3
作者：
E. Roden;D. Lovley
通讯作者：
E. Roden;D. Lovley
影响因子：
6.5
作者：
Carrasco, D;Fernández-Valiente, E;Quesada, A
通讯作者：
Quesada, A