globalchange  > 气候减缓与适应
DOI: 10.1007/s10533-014-9993-y
Scopus记录号: 2-s2.0-84904822461
论文题名:
Nitrate uptake dynamics of surface transient storage in stream channels and fluvial wetlands
作者: Wollheim W.M.; Harms T.K.; Peterson B.J.; Morkeski K.; Hopkinson C.S.; Stewart R.J.; Gooseff M.N.; Briggs M.A.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 120, 期:2018-01-03
起始页码: 239
结束页码: 257
语种: 英语
英文关键词: Denitrification ; Efficiency loss ; Fluvial wetlands ; Nitrogen cycling ; River network ; Transient storage zones
英文摘要: River systems are important regulators of anthropogenic nitrogen flux between land and ocean. Nitrogen dynamics in small headwater streams have been extensively measured, whereas less is known about contributions of other components of stream networks to nitrogen removal, including larger streams or fluvial wetlands. Here, we quantified nitrate reaction rates in higher-order stream channels and in surface transient storage (STS) zones (sub-systems with greater water residence time than the main channel) of the Ipswich River watershed, a temperate basin characterized by suburban development. We characterized uptake in STS both within higher-order stream channels and in fluvial wetlands that remain connected to advective fluxes but not constrained within channels. We compare reaction rates in these systems to those previously measured in headwater streams in the same basin. We found that (1) nitrate reaction rates (as uptake velocity, υf) in higher-order streams (n = 2) differed from each other but were consistent with previous estimates from headwater streams, (2) nitrate reaction rates in STS zones within higher-order stream channels (n = 2) were higher than rates estimated at the whole-stream scale, (3) ambient nitrate reaction rates in fluvial wetland STS (n = 7) were high but comparable to headwater streams with low nitrate concentration, (4) nitrate reaction rates were higher in fluvial wetland STS compared to headwater stream channels at elevated nitrate concentration, and (5) efficiency loss (EL) similar to that found in headwater streams was also apparent in fluvial wetlands. These results indicate that STS are potential hotspots of biogeochemical activity and should be explicitly integrated into network scale biogeochemical models. Further, experimental evidence of EL in fluvial wetlands suggests that the effectiveness of STS to retain N may decline if N loading increases. © 2014 Springer International Publishing Switzerland.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83666
Appears in Collections:气候减缓与适应
气候变化事实与影响

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作者单位: Department of Natural Resources and Environment, University of New Hampshire, Durham, NH, United States; Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham, NH, United States; Institute of Arctic Biology and Department of Biology and Wildlife, University of Alaska Fairbanks, Fairbanks, AK, United States; Ecosystems Center, Marine Biological Laboratory, Woods Hole, MA, 02543, United States; Department of Marine Science, University of Georgia, Athens, GA, 30602, United States; Department of Civil and Environmental Engineering, Colorado State University, Fort Collins, CO, 80523, United States; Office of Groundwater, Branch of Geophysics, U.S. Geological Survey, 11 Sherman Place, Unit 5015, 06269, Storrs, CT, United States

Recommended Citation:
Wollheim W.M.,Harms T.K.,Peterson B.J.,et al. Nitrate uptake dynamics of surface transient storage in stream channels and fluvial wetlands[J]. Biogeochemistry,2014-01-01,120(2018-01-03)
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