气候变化领域集成服务门户(CCPortal): Is the River a Chemostat?: Scale Versus Land Use Controls on Nitrate Concentration-Discharge Dynamics in the Upper Mississippi River Basin

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DOI	10.1029/2020GL087051
	Is the River a Chemostat?: Scale Versus Land Use Controls on Nitrate Concentration-Discharge Dynamics in the Upper Mississippi River Basin
	Marinos R.E.; Van Meter K.J.; Basu N.B.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:16
英文摘要	The Upper Mississippi River Basin is the largest source of reactive nitrogen (N) to the Gulf of Mexico. Concentration-discharge (C-Q) relationships offer a means to understand both the terrestrial sources that generate this reactive N and the in-stream processes that transform it. Progress has been made on identifying land use controls on C-Q dynamics. However, the impact of basin size and river network structure on C-Q relationships is not well characterized. Here, we show, using high-resolution nitrate concentration data, that tile drainage is a dominant control on C-Q dynamics, with increasing drainage density contributing to more chemostatic C-Q behavior. We further find that concentration variability increases, relative to discharge variability, with increasing basin size across six orders of magnitude, and this pattern is attributed to different spatial correlation structures for C and Q. Our results show how land use and river network structure jointly control riverine N export. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Cultivation; Dynamics; Nitrates; Rivers; Watersheds; Discharge dynamics; In-stream process; Land use controls; Nitrate concentration; Orders of magnitude; Reactive nitrogen; Spatial correlation structures; Upper Mississippi; Land use
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169914
作者单位	Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, ON, Canada; Department of Geology, State University of New York at Buffalo, Buffalo, NY, United States; Department of Earth and Environmental Sciences, University of Illinois at Chicago, Chicago, IL, United States; Department of Civil and Environmental Engineering, University of Waterloo, Waterloo, ON, Canada
推荐引用方式 GB/T 7714	Marinos R.E.,Van Meter K.J.,Basu N.B.. Is the River a Chemostat?: Scale Versus Land Use Controls on Nitrate Concentration-Discharge Dynamics in the Upper Mississippi River Basin[J],2020,47(16).
APA	Marinos R.E.,Van Meter K.J.,&Basu N.B..(2020).Is the River a Chemostat?: Scale Versus Land Use Controls on Nitrate Concentration-Discharge Dynamics in the Upper Mississippi River Basin.Geophysical Research Letters,47(16).
MLA	Marinos R.E.,et al."Is the River a Chemostat?: Scale Versus Land Use Controls on Nitrate Concentration-Discharge Dynamics in the Upper Mississippi River Basin".Geophysical Research Letters 47.16(2020).