DOI: 10.1111/gcb.12417
论文题名: Circumpolar assessment of permafrost C quality and its vulnerability over time using long-term incubation data
作者: Schädel C. ; Schuur E.A.G. ; Bracho R. ; Elberling B. ; Knoblauch C. ; Lee H. ; Luo Y. ; Shaver G.R. ; Turetsky M.R.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2014
卷: 20, 期: 2 起始页码: 641
结束页码: 652
语种: 英语
英文关键词: Alaska
; Boreal forest
; C decomposition
; Climate change
; Siberia
; Soil organic carbon
; Tundra
Scopus关键词: boreal forest
; carbon cycle
; carbon dioxide
; climate change
; decomposition
; organic carbon
; permafrost
; soil carbon
; soil depth
; tundra
; Alaska
; Siberia
; United States
; carbon
; soil organic carbon
; Arctic
; article
; biological model
; C decomposition
; carbon cycle
; chemistry
; climate change
; ecosystem
; metabolism
; Russian Federation
; season
; soil
; taiga
; temperature
; tundra
; United States
; Alaska
; boreal forest
; C decomposition
; climate change
; Siberia
; soil organic carbon
; tundra
; Arctic Regions
; Carbon
; Carbon Cycle
; Climate Change
; Ecosystem
; Models, Biological
; Seasons
; Soil
; Temperature
英文摘要: High-latitude ecosystems store approximately 1700 Pg of soil carbon (C), which is twice as much C as is currently contained in the atmosphere. Permafrost thaw and subsequent microbial decomposition of permafrost organic matter could add large amounts of C to the atmosphere, thereby influencing the global C cycle. The rates at which C is being released from the permafrost zone at different soil depths and across different physiographic regions are poorly understood but crucial in understanding future changes in permafrost C storage with climate change. We assessed the inherent decomposability of C from the permafrost zone by assembling a database of long-term (>1 year) aerobic soil incubations from 121 individual samples from 23 high-latitude ecosystems located across the northern circumpolar permafrost zone. Using a three-pool (i.e., fast, slow and passive) decomposition model, we estimated pool sizes for C fractions with different turnover times and their inherent decomposition rates using a reference temperature of 5 °C. Fast cycling C accounted for less than 5% of all C in both organic and mineral soils whereas the pool size of slow cycling C increased with C : N. Turnover time at 5 °C of fast cycling C typically was below 1 year, between 5 and 15 years for slow turning over C, and more than 500 years for passive C. We project that between 20 and 90% of the organic C could potentially be mineralized to CO2 within 50 incubation years at a constant temperature of 5 °C, with vulnerability to loss increasing in soils with higher C : N. These results demonstrate the variation in the vulnerability of C stored in permafrost soils based on inherent differences in organic matter decomposability, and point toward C : N as an index of decomposability that has the potential to be used to scale permafrost C loss across landscapes. © 2013 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62018
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Biology, University of Florida, Gainesville, FL, United States; Center for Permafrost (CENPERM), Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark; The University Centre in Svalbard, UNIS, Longyearbyen, Norway; Institute of Soil Science, Klima Campus, University of Hamburg, Hamburg, Germany; Climate and Global Dynamics Division, National Center for Atmospheric Research, Boulder, CO, United States; Department of Microbiology and Plant Biology, University of Oklahoma, Norman, OK, United States; The Ecosystem Center, Marine Biological Laboratory, Woods Hole, MA, United States; Department of Integrative Biology, University of Guelph, Guelph, ON, Canada
Recommended Citation:
Schädel C.,Schuur E.A.G.,Bracho R.,et al. Circumpolar assessment of permafrost C quality and its vulnerability over time using long-term incubation data[J]. Global Change Biology,2014-01-01,20(2)