气候变化领域集成服务门户(CCPortal): Effects of Damming on River Nitrogen Fluxes: A Global Analysis

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DOI	10.1029/2019GB006222
	Effects of Damming on River Nitrogen Fluxes: A Global Analysis
	Akbarzadeh Z.; Maavara T.; Slowinski S.; Van Cappellen P.
发表日期	2019
ISSN	0886-6236
EISSN	1944-9224
起始页码	1339
结束页码	1357
卷号	33 期号:11
英文摘要	Damming creates biogeochemical hotspots along rivers that modify the riverine flow of nutrients, including nitrogen (N). Here, we quantify the impact of dams on global riverine N fluxes using a reservoir N mass balance model. In-reservoir processes represented in the model include primary production, mineralization of organic N, denitrification, and sedimentary burial. In addition, we explicitly account for N fixation as a source of N, assuming that the N to phosphorus (P) ratio of the inflow regulates the magnitude of N fixation in reservoirs. The model is scaled up via a Monte Carlo analysis that yields global relationships between N elimination in reservoirs, either by denitrification or burial, and the hydraulic residence time. These relationships are then combined with N loads to the world's dam reservoirs generated by the Global-NEWS model and the estimated N fixation fluxes. According to the results, in year 2000, worldwide N fixation in reservoirs was on the order of 70 Gmol yr−1, while denitrification and burial in reservoirs eliminated around 270 Gmol yr−1, equal to 7% of N loading to the global river network. The latter is predicted to double to 14% by 2030, mainly as a result of the current boom in dam building. The results further imply that, largely due to N fixation in reservoirs, damming causes a global upward shift in riverine N:P ratios, thus lessening N limitation in receiving water bodies. ©2019. The Authors.
英文关键词	burial; denitrification; elimination; nitrogen; nitrogen fixation; river damming
语种	英语
scopus关键词	biogeochemical cycle; burial (geology); denitrification; global perspective; inflow; magnitude; nitrogen fixation; river channel
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129700
作者单位	Ecohydrology Research Group, Water Institute and Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, ON, Canada; Yale School of Forestry and Environmental Studies, Yale University, New Haven, CT, United States
推荐引用方式 GB/T 7714	Akbarzadeh Z.,Maavara T.,Slowinski S.,et al. Effects of Damming on River Nitrogen Fluxes: A Global Analysis[J],2019,33(11).
APA	Akbarzadeh Z.,Maavara T.,Slowinski S.,&Van Cappellen P..(2019).Effects of Damming on River Nitrogen Fluxes: A Global Analysis.Global Biogeochemical Cycles,33(11).
MLA	Akbarzadeh Z.,et al."Effects of Damming on River Nitrogen Fluxes: A Global Analysis".Global Biogeochemical Cycles 33.11(2019).