DOI: 10.1007/s10533-017-0294-0
Scopus记录号: 2-s2.0-85009789297
论文题名: Colimitation and the coupling of N and P uptake kinetics in oligotrophic mountain streams
作者: Piper L.R. ; Cross W.F. ; McGlynn B.L.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 132, 期: 2018-01-02 起始页码: 165
结束页码: 184
语种: 英语
英文关键词: Colimitation
; Ecological stoichiometry
; Nitrogen and phosphorus uptake
; Stream ecosystem
; Tracer Additions for Spiraling Curve Characterization (TASCC)
Scopus关键词: concentration (composition)
; ecological theory
; freshwater ecosystem
; limiting factor
; mountain stream
; nitrogen
; nutrient uptake
; oligotrophic environment
; phosphorus
; reaction kinetics
; stoichiometry
; tracer
英文摘要: Ecosystem element cycles can be tightly linked by both abiotic and biotic processes. Evidence for multi-element limitation (i.e., colimitation) of a variety of ecosystem processes is growing rapidly, yet our ability to quantify patterns of coupled nutrient dynamics at the ecosystem level has been hindered by logistical and methodological constraints. Here we quantify coupled nitrogen and phosphorus uptake kinetics in three oligotrophic mountain streams by using novel experimental techniques that quantify colimitation dynamics across a range of nutrient concentrations and stoichiometries. We show that relative demand for NO3-N and PO4-P varied across streams, but that short term availability of one nutrient consistently resulted in elevated, but variable, uptake of the other nutrient at all sites. We used temporally offset, pulsed nutrient additions to parameterize dual-nutrient Michaelis–Menten uptake surface models that represent NO3-N and PO4-P uptake at any given concentration or dissolved NO3-N:PO4-P stoichiometry. Our results indicated that the uptake of N and P were strongly enhanced in the presence of the other nutrient. Surface models quantitatively reflect patterns of colimitation and multi-element demand in streams, and should allow for parameterization of more realistic stream network models that explicitly account for interactions among element cycles. © 2017, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83308
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 Ecology, Montana State University, 310 Lewis Hall, Bozeman, MT, United States; Division of Earth and Ocean Sciences, Nicholas School of the Environment, Duke University, 109 Old Chemistry, Durham, NC, United States
Recommended Citation:
Piper L.R.,Cross W.F.,McGlynn B.L.. Colimitation and the coupling of N and P uptake kinetics in oligotrophic mountain streams[J]. Biogeochemistry,2017-01-01,132(2018-01-02)