Hotspot of dissimilatory nitrate reduction to ammonium (DNRA) process in freshwater sediments of riparian zones

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 中国科学院饮用水科学与技术重点实验室

	Hotspot of dissimilatory nitrate reduction to ammonium (DNRA) process in freshwater sediments of riparian zones
	Wang, Shanyun; Pi, Yanxia; Song, Yiping; Jiang, Yingying; Zhou, Liguang; Liu, Weiyue; Zhu, Guibing
刊名	WATER RESEARCH
	2020-04-15
卷号	173 页码:1-17
关键词	Dissimilatory nitrate reduction to ammonium (DNRA) Hotspot Riparian zone C/N ratio Nutrients circulation
ISSN号	0043-1354
英文摘要	Dissimilatory nitrate reduction to ammonium (DNRA), an important intermediate process in the N-cycle, links N-compound oxidation and reduction processes. Hence, the oxic-anoxic interface would be the hotspot of the DNRA process. In freshwater ecosystems, the riparian zone is the most typical carrier of the oxic-anoxic interface. Here we report spatio-temporal evidence of a higher abundance and rate of DNRA in the riparian zone than in the open water sediments based on molecular and N-15 isotopic-tracing technologies, hence signifying a hotspot for the DNRA process. These abudance and rates were significantly higher than those in openwater sediments. N-15 isotopic paring technology revealed that the DNRA hotspot promoted higher rates of N-compound oxidation (NO2-), reduction (NO3- and DNRA), and N-2 production (anammox and denitrification) in the riparian zone than those in open water sediment. However, high-through sequencing analysis showed that the DNRA bacteria in the riparian zone and openwater sediments were insignificantly different. Network and correlation analysis showed that the DNRA abundance and rates were significantly positively correlated with TOM, TC/NH4+, and TC/NO2-, but not with the dominant genera (Anaeromyxobacter, Lacunisphaera, and Sorangium), which played different roles on the connection in the respective community networks. The DNRA process in the riparian zone could be driven mainly by the related environmental biogeochemical characteristics induced by anthropogenic changes, followed by microbial processes. This result provides valuable information for the management of riparian zones because anthropogenic changes in the riparian water table are expected to increase, inducing consequent changes in the reduction from NO3- to NH4+. (c) 2020 Elsevier Ltd. All rights reserved.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/45302]
专题	生态环境研究中心_中国科学院饮用水科学与技术重点实验室
推荐引用方式 GB/T 7714	Wang, Shanyun,Pi, Yanxia,Song, Yiping,et al. Hotspot of dissimilatory nitrate reduction to ammonium (DNRA) process in freshwater sediments of riparian zones[J]. WATER RESEARCH,2020,173:1-17.
APA	Wang, Shanyun.,Pi, Yanxia.,Song, Yiping.,Jiang, Yingying.,Zhou, Liguang.,...&Zhu, Guibing.(2020).Hotspot of dissimilatory nitrate reduction to ammonium (DNRA) process in freshwater sediments of riparian zones.WATER RESEARCH,173,1-17.
MLA	Wang, Shanyun,et al."Hotspot of dissimilatory nitrate reduction to ammonium (DNRA) process in freshwater sediments of riparian zones".WATER RESEARCH 173(2020):1-17.