DOI: 10.1029/2019GB006222
论文题名: Effects of Damming on River Nitrogen Fluxes: A Global Analysis
作者: Akbarzadeh Z. ; Maavara T. ; Slowinski S. ; Van Cappellen P.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2019
卷: 33, 期: 11 语种: 英语
英文关键词: biogeochemical cycle
; burial (geology)
; denitrification
; global perspective
; inflow
; magnitude
; nitrogen fixation
; river channel
学科: burial
; denitrification
; elimination
; nitrogen
; nitrogen fixation
; river damming
中文摘要: 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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160095
Appears in Collections: 气候变化与战略
There are no files associated with this item.
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
Recommended Citation:
Akbarzadeh Z.,Maavara T.,Slowinski S.,et al. Effects of Damming on River Nitrogen Fluxes: A Global Analysis[J]. Global Biogeochemical Cycles,2019-01-01,33(11)