DOI: 10.1007/s10533-017-0324-y
Scopus记录号: 2-s2.0-85016131187
论文题名: Vulnerability of wetland soil carbon stocks to climate warming in the perhumid coastal temperate rainforest
作者: Fellman J.B. ; D’Amore D.V. ; Hood E. ; Cunningham P.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 133, 期: 2 起始页码: 165
结束页码: 179
语种: 英语
英文关键词: Carbon dioxide
; Dissolved organic carbon
; Dissolved organic carbon bioavailability
; Soil organic carbon turnover
; Soil respiration
Scopus关键词: bioavailability
; carbon flux
; carbon sequestration
; coastal zone
; dissolved organic carbon
; global warming
; humid environment
; rainforest
; soil carbon
; soil organic matter
; soil respiration
; temperate environment
; vulnerability
; wetland
; Alaska
; United States
英文摘要: The perhumid coastal temperate rainforest (PCTR) of southeast Alaska has some of the densest soil organic carbon (SOC) stocks in the world (>300 Mg C ha−1) but the fate of this SOC with continued warming remains largely unknown. We quantified dissolved organic carbon (DOC) and carbon dioxide (CO2) yields from four different wetland types (rich fen, poor fen, forested wetland and cedar wetland) using controlled laboratory incubations of surface (10 cm) and subsurface (25 cm) soils incubated at 8 and 15 °C for 37 weeks. Furthermore, we used fluorescence characterization of DOC and laboratory bioassays to assess how climate-induced soil warming may impact the quality and bioavailability of DOC delivered to fluvial systems. Soil temperature was the strongest control on SOC turnover, with wetland type and soil depth less important in controlling CO2 flux and extractable DOC. The high temperature incubation increased average CO2 yield by ~40 and ~25% for DOC suggesting PCTR soils contain a sizeable pool of readily biodegradable SOC that can be mineralized to DOC and CO2 with future climate warming. Fluxes of CO2 were positively correlated to both extractable DOC and percent bioavailable DOC during the last few months of the incubation suggesting mineralization of SOC to DOC is a strong control of soil respiration rates. Whether the net result is increased export of either carbon form will depend on the balance between the land to water transport of DOC and the ability of soil microbial communities to mineralize DOC to CO2. © 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/83280
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: Environmental Science Program and Alaska Coastal Rainforest Center, University of Alaska Southeast, 11120 Glacier Highway, Juneau, AK, United States; U.S.D.A. Forest Service, Pacific Northwest Research Station, 11175 Auke Lake Way, Juneau, AK, United States; Environmental Science Program, University of Alaska Southeast, 11120 Glacier Highway, Juneau, AK, United States; U.S.D.A. Forest Service, Pacific Northwest Research Station, 3200 SE Jefferson Way, Corvallis, OR, United States
Recommended Citation:
Fellman J.B.,D’Amore D.V.,Hood E.,et al. Vulnerability of wetland soil carbon stocks to climate warming in the perhumid coastal temperate rainforest[J]. Biogeochemistry,2017-01-01,133(2)