气候变化领域集成服务门户(CCPortal): Using stable isotopes to identify major flow pathways in a permafrost influenced alpine meadow hillslope during summer rainfall period

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DOI	10.1002/hyp.13650
	Using stable isotopes to identify major flow pathways in a permafrost influenced alpine meadow hillslope during summer rainfall period
	Xiao, Xiong; Zhang, Fan; Li, Xiaoyan; Zeng, Chen; Shi, Xiaonan; Wu, Huawu; Jagirani, Muhammad Dodo; Che, Tao
发表日期	2020
ISSN	0885-6087
EISSN	1099-1085
卷号	34 期号:5
英文摘要	Global warming has leaded to permafrost degradation, with potential impacts on the runoff generation processes of permafrost influenced alpine meadow hillslope. Stable isotopes have the potential to trace the complex runoff generation processes. In this study, precipitation, hillslope surface and subsurface runoff, stream water, and mobile soil water (MSW) at different hillslope positions and depths were collected during the summer rainfall period to analyse the major flow pathway based on stable isotopic signatures. The results indicated that (a) compared with precipitation, the delta H-2 values of MSW showed little temporal variation but strong heterogeneity with enriched isotopic ratios at lower hillslope positions and in deeper soil layers. (b) The delta H-2 values of middle-slope surface runoff and shallow subsurface flow were similar to those of precipitation and MSW of the same soil layer, respectively. (c) Middle-slope shallow subsurface flow was the major flow pathway of the permafrost influenced alpine meadow hillslope, which turned into surface runoff at the riparian zone before contributing to the streamflow. (d) The slight variation of delta H-2 values in stream water was shown to be related to mixing processes of new water (precipitation, 2%) and old water (middle-slope shallow subsurface flow, 98%) in the highly transmissive shallow thawed soil layers. It was inferred that supra-permafrost water levels would be lowered to a less conductive, deeper soil layer under further warming and thawing permafrost, which would result in a declined streamflow and delayed runoff peak. This study explained the rapid mobilization of old water paradox in permafrost influenced alpine meadow hillslope and improved our understanding of permafrost hillslope hydrology in alpine regions.
英文关键词	alpine meadow hillslope; permafrost; runoff generation processes; stable isotopes; subsurface flow
WOS研究方向	Water Resources
WOS类目	Water Resources
WOS关键词	HYDROLOGIC CONNECTIVITY ; RIPARIAN ZONES ; SOURCE REGION ; SOIL-WATER ; RUNOFF ; CATCHMENT ; DEGRADATION ; GENERATION ; VEGETATION ; STORMFLOW
WOS记录号	WOS:000514859900001
来源期刊	HYDROLOGICAL PROCESSES
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/241053
作者单位	[Xiao, Xiong; Zhang, Fan; Zeng, Chen; Shi, Xiaonan; Jagirani, Muhammad Dodo] Chinese Acad Sci, Key Lab Tibetan Environm Changes & Land Surface P, Inst Tibetan Plateau Res, Beijing, Peoples R China; [Xiao, Xiong; Zhang, Fan; Che, Tao] Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China; [Xiao, Xiong; Zhang, Fan; Jagirani, Muhammad Dodo] Chinese Acad Sci, Univ Chinese Acad Sci, Beijing, Peoples R China; [Li, Xiaoyan] Beijing Normal Univ, Coll Resources Sci & Technol, Beijing, Peoples R China; [Wu, Huawu] Chinese Acad Sci, Nanjing Inst Geog & Limnol, Nanjing, Peoples R China; [Che, Tao] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Lanzhou, Peoples R China
推荐引用方式 GB/T 7714	Xiao, Xiong,Zhang, Fan,Li, Xiaoyan,et al. Using stable isotopes to identify major flow pathways in a permafrost influenced alpine meadow hillslope during summer rainfall period[J]. 中国科学院西北生态环境资源研究院,2020,34(5).
APA	Xiao, Xiong.,Zhang, Fan.,Li, Xiaoyan.,Zeng, Chen.,Shi, Xiaonan.,...&Che, Tao.(2020).Using stable isotopes to identify major flow pathways in a permafrost influenced alpine meadow hillslope during summer rainfall period.HYDROLOGICAL PROCESSES,34(5).
MLA	Xiao, Xiong,et al."Using stable isotopes to identify major flow pathways in a permafrost influenced alpine meadow hillslope during summer rainfall period".HYDROLOGICAL PROCESSES 34.5(2020).