The permafrost carbon inventory on the Tibetan Plateau: a new evaluation using deep sediment cores
Ding, JZ; Li, F; Yang, GB; Chen, LY; Zhang, BB; Liu, L; Fang, K; Qin, SQ; Chen, YL; Peng, YF; Ji, CJ; He, HL; Smith, P; Yang, YH
2016
发表期刊GLOBAL CHANGE BIOLOGY
ISSN1354-1013
卷号22期号:8页码:2688-2701
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 3m 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 3m, with the median OC pool size being 15.31 Pg C (interquartile range: 13.03-17.77Pg C). 44% of OC occurred in deep layers (i.e. 100-300cm), 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.
文章类型Journal
关键词alpine permafrost carbon-climate feedback deep sediment soil organic carbon stock support vector machine
学科领域Biodiversity & Conservation ; Environmental Sciences & Ecology
研究领域[WOS]Biodiversity Conservation ; Ecology ; Environmental Sciences
关键词[WOS]SOIL ORGANIC-CARBON ; SUPPORT VECTOR MACHINES ; CLIMATE-CHANGE ; ARCTIC REGION ; VEGETATION ; CHINA ; STORAGE ; GRASSLANDS ; SIBERIA ; MATTER
收录类别SCI
语种英语
WOS记录号WOS:000380016800005
出版者WILEY-BLACKWELL
引用统计
文献类型期刊论文
条目标识符http://ir.igsnrr.ac.cn/handle/311030/44203
专题生态系统网络观测与模拟院重点实验室_生态网络实验室
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GB/T 7714
Ding, JZ,Li, F,Yang, GB,et al. The permafrost carbon inventory on the Tibetan Plateau: a new evaluation using deep sediment cores[J]. GLOBAL CHANGE BIOLOGY,2016,22(8):2688-2701.
APA Ding, JZ.,Li, F.,Yang, GB.,Chen, LY.,Zhang, BB.,...&Yang, YH.(2016).The permafrost carbon inventory on the Tibetan Plateau: a new evaluation using deep sediment cores.GLOBAL CHANGE BIOLOGY,22(8),2688-2701.
MLA Ding, JZ,et al."The permafrost carbon inventory on the Tibetan Plateau: a new evaluation using deep sediment cores".GLOBAL CHANGE BIOLOGY 22.8(2016):2688-2701.
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