DOI: 10.1007/s10533-013-9929-y
Scopus记录号: 2-s2.0-84896394121
论文题名: Stream water carbon controls in seasonally snow-covered mountain catchments: Impact of inter-annual variability of water fluxes, catchment aspect and seasonal processes
作者: Perdrial J.N. ; McIntosh J. ; Harpold A. ; Brooks P.D. ; Zapata-Rios X. ; Ray J. ; Meixner T. ; Kanduc T. ; Litvak M. ; Troch P.A. ; Chorover J.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 118, 期: 2018-01-03 起始页码: 273
结束页码: 290
语种: 英语
英文关键词: Aspect
; Carbon export
; Headwater catchment
; In stream processes
; Snowmelt
; Water fluxes
Scopus关键词: annual variation
; assessment method
; carbon dioxide
; carbon flux
; catchment
; correlation
; dissolved organic matter
; hillslope
; mountain environment
; precipitation (climatology)
; reservoir
; respiration
; seasonality
; signaling
; snow cover
; snowmelt
; stream
; New Mexico
; United States
; Valles Caldera National Preserve
英文摘要: Stream water carbon (C) export is one important pathway for C loss from seasonally snow-covered mountain ecosystems and an assessment of overarching controls is necessary. However, such assessment is challenging because changes in water fluxes or flow paths, seasonal processes, as well as catchment specific characteristics play a role. For this study we elucidate the impact of: (i) changes in water flux (by comparing years of variable wetness), (ii) catchment aspect [north-facing (NF) vs. south-facing (SF)] and (iii) season (snowmelt vs. summer) on all forms of dissolved stream water C [dissolved organic C (DOC), chromophoric dissolved organic matter (CDOM) and dissolved inorganic C (DIC)] in forested catchments within the Valles Caldera National Preserve, New Mexico. The significant correlation between annual water and C fluxes (e.g. DOC r2 = 0.83, p < 0.02) confirms annual stream water discharge as the overarching control on C efflux, likely from a well-mixed ground water reservoir as indicated by previous research. However, CDOM exhibited a dominantly terrestrial fluorescence signature (59-71 %) year round, signaling a strong riparian and near stream soil control on CDOM composition. During snowmelt, the role of water as C transporter was superimposed on its control as C reservoir, when the NF stream transported significantly more soil C (40 % DOC, 56 % DIC) than the SF stream as a result of hillslope flushing. Inter-annual variations in winter precipitation were paramount in regulating annual stream C effluxes, e.g., reducing C effluxes three-fold after a dry (relative to wet) winter season. During the warmer summer months % dissolved oxygen saturation decreased, δ13CDIC increased and CDOM assumed a more microbial signature, consistent with heterotrophic respiration in the stream and riparian soils. As a result of stream C incubation and soil respiration, PCO2 increased up to 12 times atmospheric values leading to substantial degassing. © 2013 Springer Science+Business Media Dordrecht. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83590
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 Soil, Water and Environmental Science, University of Arizona, Tucson, AZ, United States; Department of Hydrology and Water Resources, University of Arizona, Tucson, AZ, United States; Department of Geology, University of Puget Sound, Tacoma, WA, United States; Jozef Stefan Institute, Ljubljana, Slovenia; Department of Biology, University of New Mexico, Albuquerque, NM, United States; Department of Geology, University of Vermont, Burlington, VT, United States
Recommended Citation:
Perdrial J.N.,McIntosh J.,Harpold A.,et al. Stream water carbon controls in seasonally snow-covered mountain catchments: Impact of inter-annual variability of water fluxes, catchment aspect and seasonal processes[J]. Biogeochemistry,2014-01-01,118(2018-01-03)