DOI: 10.1038/s41561-017-0056-6
论文题名: Contribution of wetlands to nitrate removal at the watershed scale
作者: Hansen A.T. ; Dolph C.L. ; Foufoula-Georgiou E. ; Finlay J.C.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2018
卷: 11, 期: 2 起始页码: 127
结束页码: 132
语种: 英语
Scopus关键词: cover crop
; intensive agriculture
; land cover
; nitrate
; nitrogen
; pollutant removal
; river water
; streamflow
; water quality
; watershed
; wetland
; Minnesota
; Minnesota Basin
; Mississippi River
; United States
英文摘要: Intensively managed row crop agriculture has fundamentally changed Earth surface processes within the Mississippi River basin through large-scale alterations of land cover, hydrology and reactive nitrogen availability. These changes have created leaky landscapes where excess agriculturally derived nitrate degrades riverine water quality at local, regional and continental scales. Individually, wetlands are known to remove nitrate but the conditions under which multiple wetlands meaningfully reduce riverine nitrate concentration have not been established. Only one region of the Mississippi River basin - the 44,000 km2 Minnesota River basin - still contains enough wetland cover within its intensively agriculturally managed watersheds to empirically address this question. Here we combine high-resolution land cover data for the Minnesota River basin with spatially extensive repeat water sampling data. By clearly isolating the effect of wetlands from crop cover, we show that, under moderate-high streamflow, wetlands are five times more efficient per unit area at reducing riverine nitrate concentration than the most effective land-based nitrogen mitigation strategies, which include cover crops and land retirement. Our results suggest that wetland restorations that account for the effects of spatial position in stream networks could provide a much greater benefit to water quality then previously assumed. © 2018 The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105613
Appears in Collections: 气候减缓与适应 科学计划与规划
There are no files associated with this item.
作者单位: St Anthony Falls Laboratory and National Center for Earth-Surface Dynamics, College of Science and Engineering, University of Minnesota, Minneapolis, MN, United States; Department of Ecology Evolution and Behavior, University of Minnesota, St. Paul, MN, United States; Henry Samueli School of Engineering, Department of Civil and Environmental Engineering, University of California-Irvine, Irvine, CA, United States
Recommended Citation:
Hansen A.T.,Dolph C.L.,Foufoula-Georgiou E.,et al. Contribution of wetlands to nitrate removal at the watershed scale[J]. Nature Geoscience,2018-01-01,11(2)