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Climate changes and its impact on tundra ecosystem in Qinghai-Tibet Plateau, China
Wang, Genxu1,2; Bai, Wei2; Li, Na1; Hu, Hongchang2
Corresponding AuthorWang, GX (王根绪)
Source PublicationCLIMATIC CHANGE
AbstractAlpine ecosystems in permafrost region are extremely sensitive to climate change. The headwater regions of Yangtze River and Yellow River of the Qinghai-Tibet plateau permafrost area were selected. Spatial-temporal shifts in the extent and distribution of tundra ecosystems were investigated for the period 1967-2000 by landscape ecological method and aerial photographs for 1967, and satellite remote sensing data (the Landsat's TM) for 1986 and 2000. The relationships were analyzed between climate change and the distribution area variation of tundra ecosystems and between the permafrost change and tundra ecosystems. The responding model of tundra ecosystem to the combined effects of climate and permafrost changes was established by using statistic regression method, and the contribution of climate changes and permafrost variation to the degradation of tundra ecosystems was estimated. The regional climate exhibited a tendency towards significant warming and desiccation with the air temperature increased by 0.4-0.67A degrees C/10a and relative stable precipitation over the last 45 years. Owing to the climate continuous warming, the intensity of surface heat source (HI) increased at the average of 0.45 W/m(2) per year, the difference of surface soil temperature and air temperature (DT) increased at the range of 4.1A degrees C-4.5A degrees C, and the 20-cm depth soil temperature within the active layer increased at the range of 1.1A degrees C-1.4A degrees C. The alpine meadow and alpine swamp meadow were more sensitive to permafrost changes than alpine steppe. The area of alpine swamp meadow decreased by 13.6-28.9%, while the alpine meadow area decreased by 13.5-21.3% from 1967 to 2000. The contributions of climate change to the degradation of the alpine meadow and alpine swamp was 58-68% and 59-65% between 1967 and 2000. The synergic effects of climate change and permafrost variation were the major drivers for the observed degradation in tundra ecosystems of the Qinghai-Tibet plateau.
KeywordNorthern Alaska Permafrost Vegetation Treeline
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine ; Physical Sciences
WOS Subject ExtendedEnvironmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
Indexed BySCI
WOS SubjectEnvironmental Sciences ; Meteorology & Atmospheric Sciences
WOS IDWOS:000290448700007
Funding OrganizationNational Key Scientific Program (973)(2007CB411504) ; Natural Science Foundation of China(40925002 ; Chinese Academy of Science ; 40730634)
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Cited Times:63[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Key Lab Mt Environm Evolvement & Regulat, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China
2.Lanzhou Univ, Nat & Environm Coll, Lanzhou 730000, Peoples R China
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
Wang, Genxu,Bai, Wei,Li, Na,et al. Climate changes and its impact on tundra ecosystem in Qinghai-Tibet Plateau, China[J]. CLIMATIC CHANGE,2011,106(3):463-482.
APA Wang, Genxu,Bai, Wei,Li, Na,&Hu, Hongchang.(2011).Climate changes and its impact on tundra ecosystem in Qinghai-Tibet Plateau, China.CLIMATIC CHANGE,106(3),463-482.
MLA Wang, Genxu,et al."Climate changes and its impact on tundra ecosystem in Qinghai-Tibet Plateau, China".CLIMATIC CHANGE 106.3(2011):463-482.
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