DOI: 10.1111/gcb.13257
论文题名: The permafrost carbon inventory on the Tibetan Plateau: a new evaluation using deep sediment cores
作者: Ding J. ; Li F. ; Yang G. ; Chen L. ; Zhang B. ; Liu L. ; Fang K. ; Qin S. ; Chen Y. ; Peng Y. ; Ji C. ; He H. ; Smith P. ; Yang Y.
刊名: Global change biology
ISSN: 13652486
出版年: 2016
卷: 22, 期: 8 起始页码: 2688
结束页码: 2701
语种: 英语
英文关键词: alpine permafrost
; carbon-climate feedback
; deep sediment
; soil organic carbon stock
; support vector machine
Scopus关键词: carbon
; alpine environment
; carbon emission
; climate feedback
; Monte Carlo analysis
; organic carbon
; permafrost
; sediment core
; soil organic matter
; spatial variation
; support vector machine
; warming
; chemistry
; climate
; grassland
; permafrost
; Tibet
; Carbon
; Climate
; Grassland
; Permafrost
; Tibet
; China
; Qinghai-Xizang Plateau
英文摘要: The permafrost organic carbon (OC) stock is of global significance because of its large pool size and the potential positive feedback to climate warming. However, due to the lack of systematic field observations and appropriate upscaling methodologies, substantial uncertainties exist in the permafrost OC budget, which limits our understanding of the fate of frozen carbon in a warming world. In particular, the lack of comprehensive estimates of OC stocks across alpine permafrost means that current knowledge on this issue remains incomplete. Here, we evaluated the pool size and spatial variations of permafrost OC stock to 3 m depth on the Tibetan Plateau by combining systematic measurements from a substantial number of pedons (i.e. 342 three-metre-deep cores and 177 50-cm-deep pits) with a machine learning technique (i.e. support vector machine, SVM). We also quantified uncertainties in permafrost carbon budget by conducting Monte Carlo simulations. Our results revealed that the combination of systematic measurements with the SVM model allowed spatially explicit estimates to be made. The OC density (OC amount per unit area, OCD) exhibited a decreasing trend from the south-eastern to the north-western plateau, with the exception that OCD in the swamp meadow was substantially higher than that in surrounding regions. Our results also demonstrated that Tibetan permafrost stored a large amount of OC in the top 3 m, with the median OC pool size being 15.31 Pg C (interquartile range: 13.03-17.77 Pg C). 44% of OC occurred in deep layers (i.e. 100-300 cm), close to the proportion observed across the northern circumpolar permafrost region. The large carbon pool size together with significant permafrost thawing suggests a risk of carbon emissions and positive climate feedback across the Tibetan alpine permafrost region. © 2016 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61337
Appears in Collections: 影响、适应和脆弱性
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作者单位: State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Inner Mongolia University of Technology, Inner Mongolia, 010051, China; Department of Ecology, and Key Laboratory for Earth Surface Processes of the Ministry of Education, Peking University, Beijing, 100871, China; Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China; Institute of Biological and Environmental Sciences, University of Aberdeen, Aberdeen, AB24 3UU, UK
Recommended Citation:
Ding J.,Li F.,Yang G.,et al. The permafrost carbon inventory on the Tibetan Plateau: a new evaluation using deep sediment cores[J]. Global change biology,2016-01-01,22(8)