DOI: 10.1016/j.gloplacha.2014.09.002
论文题名: Changes in active-layer thickness and near-surface permafrost between 2002 and 2012 in alpine ecosystems, Qinghai-Xizang (Tibet) Plateau, China
作者: Wu Q. ; Hou Y. ; Yun H. ; Liu Y.
刊名: Global and Planetary Change
ISSN: 0921-8181
出版年: 2015
卷: 124 起始页码: 149
结束页码: 155
语种: 英语
英文关键词: Active-layer thickness (ALT)
; Alpine ecosystems
; Climate change
; Permafrost temperature
; Qinghai-Tibet Plateau
Scopus关键词: Climate change
; Ecology
; Ecosystems
; Rain
; Temperature
; Temperature measurement
; Thawing
; Vegetation
; Active Layer
; Climate variability
; Mean annual air temperatures
; Qinghai Tibet plateau
; Seasonal changes
; Soil temperature measurements
; Summer rainfall
; Weather stations
; Permafrost
; air temperature
; alpine environment
; climate change
; freeze-thaw cycle
; permafrost
; soil temperature
; temperature effect
; China
; Qinghai-Xizang Plateau
英文摘要: Between 2002 and 2012, daily soil temperature measurements were made at 10 sites within five alpine ecosystems in the Beiluhe area of the central Qinghai-Tibet Plateau. Changes in freeze-thaw occurrence, active-layer thickness and near-surface permafrost temperature in barren, desert grassland, alpine steppe and alpine meadow ecosystems indicate that alpine ecosystems are sensitive to climate variability. During this time, the average onset of spring thawing at 50-cm depth advanced by at least 16. days in all but the barren alpine settings, and the duration of thaw increased by at least 14. days for all but the desert grassland and barren ecosystems. All sites showed an increase in active-layer thickness (ALT) and near-surface permafrost temperature: the average increase of ALT was ~. 4.26. cm/a and the average increase in permafrost temperatures at 6. m and 10. m depths were, respectively, ~. 0.13. °C and ~. 0.14. °C. No apparent trend in mean annual air temperature was detected at the Beiluhe weather station. However, an increasing trend in precipitation was measured. This suggests that the primary control on the ALT increase was an increase in summer rainfall and the primary control on increasing permafrost temperature was probably the combined effects of increasing rainfall and the asymmetrical seasonal changes in subsurface soil temperatures. © 2014 Elsevier B.V. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84920277160&doi=10.1016%2fj.gloplacha.2014.09.002&partnerID=40&md5=a2b36f97c4f41516d442d815be35f5da
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11570
Appears in Collections: 全球变化的国际研究计划 气候变化与战略
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作者单位: State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, China
Recommended Citation:
Wu Q.,Hou Y.,Yun H.,et al. Changes in active-layer thickness and near-surface permafrost between 2002 and 2012 in alpine ecosystems, Qinghai-Xizang (Tibet) Plateau, China[J]. Global and Planetary Change,2015-01-01,124.