The permafrost carbon inventory on the Tibetan Plateau: a new evaluation   using deep sediment cores

doi:10.1111/gcb.13257

CORC > 北京大学 > 城市与环境学院

	The permafrost carbon inventory on the Tibetan Plateau: a new evaluation using deep sediment cores
	Ding, Jinzhi ; Li, Fei ; Yang, Guibiao ; Chen, Leiyi ; Zhang, Beibei ; Liu, Li ; Fang, Kai ; Qin, Shuqi ; Chen, Yongliang ; Peng, Yunfeng ; Ji, Chengjun ; He, Honglin ; Smith, Pete ; Yang, Yuanhe
刊名	GLOBAL CHANGE BIOLOGY
	2016
关键词	alpine permafrost carbon-climate feedback deep sediment soil organic carbon stock support vector machine SOIL ORGANIC-CARBON SUPPORT VECTOR MACHINES CLIMATE-CHANGE ARCTIC REGION VEGETATION CHINA STORAGE GRASSLANDS SIBERIA MATTER
DOI	10.1111/gcb.13257
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 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.; National Basic Research Program of China on Global Change [2014CB954001, 2015CB954201]; National Natural Science Foundation of China [31322011, 41371213]; Chinese Acedemy of Sciences-Peking University Pioneer Collaboration Team; Thousand Young Talents Program; SCI(E); PubMed; ARTICLE; yhyang@ibcas.ac.cn; 8; 2688-2701; 22
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/434757]
专题	城市与环境学院
推荐引用方式 GB/T 7714	Ding, Jinzhi,Li, Fei,Yang, Guibiao,et al. The permafrost carbon inventory on the Tibetan Plateau: a new evaluation using deep sediment cores[J]. GLOBAL CHANGE BIOLOGY,2016.
APA	Ding, Jinzhi.,Li, Fei.,Yang, Guibiao.,Chen, Leiyi.,Zhang, Beibei.,...&Yang, Yuanhe.(2016).The permafrost carbon inventory on the Tibetan Plateau: a new evaluation using deep sediment cores.GLOBAL CHANGE BIOLOGY.
MLA	Ding, Jinzhi,et al."The permafrost carbon inventory on the Tibetan Plateau: a new evaluation using deep sediment cores".GLOBAL CHANGE BIOLOGY (2016).