Arid
DOI10.1002/eap.1709
Controls on denitrification potential in nitrate-rich waterways and riparian zones of an irrigated agricultural setting
Webster, Alex J.1,2; Groffman, Peter M.3,4,5; Cadenasso, Mary L.1
通讯作者Webster, Alex J.
来源期刊ECOLOGICAL APPLICATIONS
ISSN1051-0761
EISSN1939-5582
出版年2018
卷号28期号:4页码:1055-1067
英文摘要

Denitrification, the microbial conversion of NO3 to N gases, is an important process contributing to whether lotic and riparian ecosystems act as sinks for excess NO3- from agricultural activities. Though agricultural waterways and riparian zones have been a focus of denitrification research for decades, almost none of this research has occurred in the irrigated agricultural settings of arid and semiarid climates. In this study, we conducted a broad survey of denitrification potential in riparian soils and channel sediments from 79 waterway reaches in the irrigated agricultural landscape of California’s Central Valley. With this approach, we sought to capture the wide range of variation that arose from diverse waterway management and fluctuating flow conditions, and use this variation to identify promising management interventions. We explored associations of denitrification potentials with surface water NO3--N, organic matter, flow conditions, vegetation cover, near-channel riparian bank slope, and channel geomorphic features using generalized linear mixed models. We found strong associations of sediment denitrification potentials with reach flow conditions, which we hypothesize was the result of variation in microbial communities’ tolerance to dry-wet cycles. Denitrification potentials in riparian soils, in contrast, did not appear affected by flow conditions, but instead were associated with organic matter, vegetation cover, and bank slope in the riparian zone. These results suggest a strong need for further work on how denitrification responds to varying flow conditions and dry-wet cycles in non-perennial lotic ecosystems. Our findings also demonstrate that denitrifier communities respond to key features of waterway management, which can therefore be leveraged to control denitrification through a variety of management actions.


英文关键词agricultural streams denitrification intermittent streams nitrate riparian zones sediment
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000434092200016
WOS关键词LANDSCAPE SCALE ; ENZYME-ACTIVITY ; STREAM ; SOIL ; GAS ; ECOSYSTEM ; SUSTAINABILITY ; HETEROGENEITY ; DESICCATION ; DISTURBANCE
WOS类目Ecology ; Environmental Sciences
WOS研究方向Environmental Sciences & Ecology
来源机构University of California, Davis
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/208693
作者单位1.Univ Calif Davis, Dept Plant Sci, Shields Ave, Davis, CA 95616 USA;
2.Univ Calif Davis, Grad Grp Ecol, Shields Ave, Davis, CA 95616 USA;
3.Cary Inst Ecosyst Studies, Millbrook, NY 12545 USA;
4.CUNY, Adv Res Ctr, New York, NY 12210 USA;
5.CUNY Brooklyn Coll, New York, NY 12210 USA
推荐引用方式
GB/T 7714
Webster, Alex J.,Groffman, Peter M.,Cadenasso, Mary L.. Controls on denitrification potential in nitrate-rich waterways and riparian zones of an irrigated agricultural setting[J]. University of California, Davis,2018,28(4):1055-1067.
APA Webster, Alex J.,Groffman, Peter M.,&Cadenasso, Mary L..(2018).Controls on denitrification potential in nitrate-rich waterways and riparian zones of an irrigated agricultural setting.ECOLOGICAL APPLICATIONS,28(4),1055-1067.
MLA Webster, Alex J.,et al."Controls on denitrification potential in nitrate-rich waterways and riparian zones of an irrigated agricultural setting".ECOLOGICAL APPLICATIONS 28.4(2018):1055-1067.
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