Sediment denitrification in Yangtze lakes is mainly influenced by environmental conditions but not biological communities

doi:10.1016/j.scitotenv.2017.10.221

CORC > 武汉植物园 > 中国科学院武汉植物园

	Sediment denitrification in Yangtze lakes is mainly influenced by environmental conditions but not biological communities
	Yao, Lu 1; Liu, Wenzhi 1,2; Jiang, Xiaoliang 1; Guo, Laodong 2; Cheng, Xiaoli 1; Liu, Guihua 1
刊名	SCIENCE OF THE TOTAL ENVIRONMENT
	2018-03-01
卷号	616 页码:978-987
关键词	Denitrification genes Eutrophication Greenhouse gas Nitrogen cycles Submerged vegetation
ISSN号	0048-9697
DOI	10.1016/j.scitotenv.2017.10.221
英文摘要	Globally, shallow lakes have suffered from excessive nitrogen (N) loading due to increased human activities in catchments, resulting in water quality degradation and aquatic biodiversity loss. Sediment denitrification, which reduces nitrate (NO3-) to N gaseous products, is the most important mechanism for permanent N removal in freshwater lakes. However, the relative contribution of abiotic and biotic factors to the sediment denitrification is highly variable. Here, we determined the unamended denitrification rate and nitrous oxide (N2O) production rate of 74 sediment samples from 22 eutrophic lakes in the Yangtze River basin. We also quantified the diversity and abundance of denitrifying communities using nirK and nirS genes. The results of variance partitioning analyses showed that water physicochemical properties (e.g., dissolved oxygen) and nutrients (e.g., NO(3)(-)concentration) but not denitrifier communities and submerged vegetation were the major factor groups predicting denitrification and N2O production rates. Path analyses further revealed that water physicochemical properties and nutrients could affect denitrification and N2O production rates both directly and indirectly, and the direct effects were considerably higher than the indirect effects mediated through changes in sediment characteristics, denitrifier communities and submerged vegetation. These findings suggest that the dominant N removal process in Yangtze lakes is largely regulated by abiotic factors rather than diversity and abundance of denitrifiers and submerged macrophytes. Additionally, the findings in this study are helpful in developing a targeted strategy to assess and enhance the N removal capability of eutrophic lakes in China. (c) 2017 Elsevier B.V. All rights reserved.
资助项目	National Natural Science Foundation of China[31570535] ; National Natural Science Foundation of China[31400327] ; National Science and Technology Basic Special of China[2014FY210700]
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000424121800099
内容类型	期刊论文
源URL	[http://202.127.146.157/handle/2RYDP1HH/4752]
专题	中国科学院武汉植物园
通讯作者	Liu, Guihua
作者单位	1.Chinese Acad Sci, Wuhan Bot Garden, Key Lab Aquat Bot & Watershed Ecol, Wuhan 430074, Hubei, Peoples R China 2.Univ Wisconsin, Sch Freshwater Sci, Milwaukee, WI 53204 USA
推荐引用方式 GB/T 7714	Yao, Lu,Liu, Wenzhi,Jiang, Xiaoliang,et al. Sediment denitrification in Yangtze lakes is mainly influenced by environmental conditions but not biological communities[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2018,616:978-987.
APA	Yao, Lu,Liu, Wenzhi,Jiang, Xiaoliang,Guo, Laodong,Cheng, Xiaoli,&Liu, Guihua.(2018).Sediment denitrification in Yangtze lakes is mainly influenced by environmental conditions but not biological communities.SCIENCE OF THE TOTAL ENVIRONMENT,616,978-987.
MLA	Yao, Lu,et al."Sediment denitrification in Yangtze lakes is mainly influenced by environmental conditions but not biological communities".SCIENCE OF THE TOTAL ENVIRONMENT 616(2018):978-987.