Importance of denitrification driven by the relative abundances of microbial communities in coastal wetlands

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 城市与区域生态国家重点实验室

	Importance of denitrification driven by the relative abundances of microbial communities in coastal wetlands
	Zhang, Yan ; Ji, Guodong ; Wang, Chen ; Zhang, Xuanrui ; Xu, Ming
刊名	ENVIRONMENTAL POLLUTION
	2019
卷号	244 页码:47-54
关键词	Coastal wetland Nitrogen cycle Denitrification Functional gene Eastern China
ISSN号	0269-7491
英文摘要	Excessive nitrogen (N) loadings from human activities have led to increased eutrophication and associated water quality impacts in China's coastal wetlands. Denitrification accounts for significant reduction of inorganic N to nitrous oxide (N2O) or dinitrogen gas (N-2), and thereby curtails harmful effects of N pollution in coastal and marine ecosystems. However, the molecular drivers and limiting steps of denitrification in coastal wetlands are not well understood. Here, we quantified the abundances of functional genes involved in N cycling and determined denitrification rates using N-15 paring technique in the coastal wetland sediments of Bohai Economic Rim in eastern China. Denitrification accounting for 80.7 +/- 12.6% of N removal was the dominant pathway for N removal in the coastal wetlands. In comparison, anaerobic ammonium oxidation (ANAMMOX) removed up to 36.9 +/- 7.3% of inorganic N. Structural equation modeling analysis indicated that the effects of ammonium on denitrification potential were mainly mediated by the relative abundances of nosZ/nirS, nirS/(narG + napA) and amoA/nirK. Denitrification was limited by the relative strength of two steps, namely N2O reduction to N-2 and nitrite (NO2-) reduction to nitric oxide (NO). Our results suggest that the relative abundances of functional genes which are more stable than sediment chemical compounds in the context of environmental changes are indictive of denitrification potential in coastal wetlands. (C) 2018 Elsevier Ltd. All rights reserved.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/42853]
专题	生态环境研究中心_城市与区域生态国家重点实验室
作者单位	1.Peking Univ, Dept Environm Engn, Minist Educ, Key Lab Water & Sediment Sci, Beijing 100871, Peoples R China 2.Rutgers State Univ, Dept Ecol Evolut & Nat Resources, New Brunswick, NJ 08901 USA 3.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing 100085, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Yan,Ji, Guodong,Wang, Chen,et al. Importance of denitrification driven by the relative abundances of microbial communities in coastal wetlands[J]. ENVIRONMENTAL POLLUTION,2019,244:47-54.
APA	Zhang, Yan,Ji, Guodong,Wang, Chen,Zhang, Xuanrui,&Xu, Ming.(2019).Importance of denitrification driven by the relative abundances of microbial communities in coastal wetlands.ENVIRONMENTAL POLLUTION,244,47-54.
MLA	Zhang, Yan,et al."Importance of denitrification driven by the relative abundances of microbial communities in coastal wetlands".ENVIRONMENTAL POLLUTION 244(2019):47-54.