DOI: 10.1007/s10533-016-0284-7
Scopus记录号: 2-s2.0-85002288997
论文题名: Uptake of ammonium and soluble reactive phosphorus in forested streams: influence of dissolved organic matter composition
作者: Coble A.A. ; Marcarelli A.M. ; Kane E.S. ; Huckins C.J.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2016
卷: 131, 期: 3 起始页码: 355
结束页码: 372
语种: 英语
英文关键词: Ammonium
; Fluorescence index
; Soluble reactive phosphorus
; Temperate forested streams
; Uptake velocity
Scopus关键词: ammonium
; biotransformation
; concentration (composition)
; deciduous forest
; discharge
; dissolved organic matter
; least squares method
; nutrient uptake
; phosphorus
; regression analysis
; streamflow
; water quality
; Great Lakes [North America]
; Lake Superior
英文摘要: Many microbes responsible for inorganic nutrient uptake and transformation utilize dissolved organic matter (DOM) as a nutrient or energy source, but little is known about whether DOM composition is an important driver of nutrient uptake in streams. Our goal was to determine whether incorporating DOM composition metrics with other more commonly considered biological, physical, and chemical variables improved our ability to explain patterns of ammonium (NH4+–N) and soluble reactive phosphorus (SRP) uptake across 11 Lake Superior tributaries. Nutrient uptake velocities (Vf) ranged from undetectable to 14.6 mm min−1 for NH4+–N and undetectable to 7.2 mm min−1 for SRP. Logistic regressions suggested that DOM composition was a useful predictor of where SRP uptake occurred (4/11 sites) and NH4+–N concentration was a useful predictor of where NH4+–N uptake occurred (9/11 sites). Multiple regression analysis revealed that the best models included temperature, specific discharge, and canopy cover, and DOM composition as significant predictors of NH4+–N Vf. Partial least squares revealed fluorescence index (describing the source of aquatic fulvic acids), specific ultraviolet absorbance at 254 nm (an indicator of DOM aromaticity), temperature, and conductivity were highly influential predictors of NH4+–N Vf. Therefore, streams with higher temperatures, lower solute concentrations, more terrestrial DOM signal and greater aromaticity had greater NH4+–N Vf. Our results suggest that DOM composition may be an important, yet often overlooked, predictor of NH4+–N and SRP uptake in deciduous forest streams that should be considered along with commonly measured predictors. © 2016, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83323
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, Michigan Technological University, Houghton, MI, United States; School of Forest Resources and Environmental Science, Michigan Technological University, Houghton, MI, United States; Northern Research Station, U.S. Forest Service, Houghton, MI, United States; Department of Natural Resources and the Environment, University of New Hampshire, Durham, NH, United States
Recommended Citation:
Coble A.A.,Marcarelli A.M.,Kane E.S.,et al. Uptake of ammonium and soluble reactive phosphorus in forested streams: influence of dissolved organic matter composition[J]. Biogeochemistry,2016-01-01,131(3)