DOI: 10.1007/s10533-015-0118-z
Scopus记录号: 2-s2.0-84938289372
论文题名: The varying role of water column nutrient uptake along river continua in contrasting landscapes
作者: Reisinger A.J. ; Tank J.L. ; Rosi-Marshall E.J. ; Hall R.O. ; Jr. ; Baker M.A.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 125, 期: 1 起始页码: 115
结束页码: 131
语种: 英语
英文关键词: Nitrogen
; Nutrient uptake
; Phosphorus
; River continuum
; Water column
Scopus关键词: benthic environment
; carbon cycle
; energy balance
; headwater
; nitrogen
; nutrient uptake
; phosphorus
; solute
; sorption
; transformation
; water column
英文摘要: Nutrient transformation processes such as assimilation, dissimilatory transformation, and sorption to sediments are prevalent in benthic zones of headwater streams, but may also occur in the water column. The river continuum concept (RCC) predicts that water column processes become increasingly important with increasing stream size. We predicted that water column nutrient uptake increases with stream size, mirroring carbon/energy dynamics predicted by the RCC. We measured water column uptake of ammonium (NH4 +), nitrate (NO3 -), and soluble reactive phosphorus (SRP) in 1st through 5th order stream and river reaches (discharge: 50–68,000 L s−1) in three watersheds ranging from <1 to >70 % developed lands. We found that water column volumetric uptake (Uvol ) of (NH4 +), (NO3 -), and SRP did not significantly differ among watersheds and we did not find any longitudinal patterns for Uvol . Uptake velocity (vf ) of (NH4 +) increased with stream size, whereas NO3 - and SRP vf did not differ with stream size or among watersheds. Both Uvol and vf were related to water column metabolism and material suspended in the water column, but specific relationships differed among solutes and uptake metrics. Median water column vf across 15 sites was 4, 9, and 19 % of median whole-stream NH4 +, NH4 +, and SRP vf based upon a previous meta-analysis. Thus, although we could not demonstrate a generalized longitudinal pattern in water column nutrient uptake, water column processes can be important. An improved mechanistic understanding of the controls on uptake and the ultimate fate of nutrients will facilitate effective management and restoration for mitigating downstream nutrient export. © 2015, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83489
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 Biological Sciences, University of Notre Dame, Notre Dame, IN, United States; Cary Institute of Ecosystem Studies, Millbrook, NY, United States; Department of Zoology and Physiology, University of Wyoming, Laramie, WY, United States; Department of Biology and the Ecology Center, Utah State University, Logan, UT, United States
Recommended Citation:
Reisinger A.J.,Tank J.L.,Rosi-Marshall E.J.,et al. The varying role of water column nutrient uptake along river continua in contrasting landscapes[J]. Biogeochemistry,2015-01-01,125(1)