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DOI	10.1002/2015JG003235
	Carbon loss and chemical changes from permafrost collapse in the northern Tibetan Plateau
	Mu, Cuicui; Zhang, Tingjun; Zhang, Xiankai; Li, Lili; Guo, Hong; Zhao, Qian; Cao, Lin; Wu, Qingbai; Cheng, Guodong
发表日期	2016
ISSN	2169-8953
EISSN	2169-8961
起始页码	1781
结束页码	1791
卷号	121 期号:7
英文摘要	Permafrost collapse, known as thermokarst, can alter soil properties and carbon emissions. However, little is known regarding the effects of permafrost collapse in upland landscapes on the biogeochemical processes that affect carbon balance. In this study, we measured soil carbon and physiochemical properties at a large thermokarst feature on a hillslope in the northeastern Tibetan Plateau. We categorized surfaces into three different microrelief patches based on type and extent of collapse (control, drape, and exposed areas). Permafrost collapse resulted in substantial decreases of surface soil carbon and nitrogen stocks, with losses of 29.64.2% and 28.93.1% for carbon and nitrogen, respectively, in the 0-10cm soil layer. Laboratory incubation experiments indicated that control soil had significantly higher CO2 production rates than that of drapes. The results from Fourier transform infrared spectroscopy analysis showed that exposed soils accumulated some organic matter due to their low position within the feature, which was accompanied by substantial changes in the chemical structure and characteristics of the soil carbon. Exposed soils had higher hydrocarbon and lignin/phenol backbone content than in control and drape soils in the 0-10cm layer. This study demonstrates that permafrost collapse can cause abundant carbon and nitrogen loss, potentially from mineralization, leaching, photodegradation, and lateral displacement. These results demonstrate that permafrost collapse redistributes the soil organic matter, changes its chemical characteristics, and leads to losses of organic carbon due to the greenhouse gas emission.
英文关键词	permafrost; Qinghai-Tibetan Plateau; soil organic carbon; permafrost collapse; CO2 production
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Geology
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary
WOS关键词	SOIL ORGANIC-MATTER ; HEIHE RIVER-BASIN ; ACTIVE-LAYER ; UPPER REACH ; THAW SLUMP ; NITROGEN ; MINERALIZATION ; CLIMATE ; REGIONS ; QUALITY
WOS记录号	WOS:000382581900005
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/240250
作者单位	[Mu, Cuicui; Zhang, Tingjun; Zhang, Xiankai; Li, Lili; Guo, Hong; Zhao, Qian; Cao, Lin] Lanzhou Univ, Coll Earth & Environm Sci, Key Lab Western Chinas Environm Syst, Minist Educ, Lanzhou, Peoples R China; [Wu, Qingbai; Cheng, Guodong] Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, State Key Lab Frozen Soil Engn, Lanzhou, Peoples R China
推荐引用方式 GB/T 7714	Mu, Cuicui,Zhang, Tingjun,Zhang, Xiankai,et al. Carbon loss and chemical changes from permafrost collapse in the northern Tibetan Plateau[J]. 中国科学院西北生态环境资源研究院,2016,121(7).
APA	Mu, Cuicui.,Zhang, Tingjun.,Zhang, Xiankai.,Li, Lili.,Guo, Hong.,...&Cheng, Guodong.(2016).Carbon loss and chemical changes from permafrost collapse in the northern Tibetan Plateau.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,121(7).
MLA	Mu, Cuicui,et al."Carbon loss and chemical changes from permafrost collapse in the northern Tibetan Plateau".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 121.7(2016).