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学科主题: 地理学::自然地理学
题名: The role of permafrost and soil water in distribution of alpine grassland and its NDVI dynamics on the Qinghai-Tibetan Plateau
作者: Wang, XY (Wang, Xiaoyun)1, 2; Yi, SH (Yi, Shuhua)2; Wu, QB (Wu, Qingbai)3; Yang, K (Yang, Kun)4; Ding, YJ (Ding, Yongjian)2
通讯作者: Yi, SH
关键词: DIFFERENCE VEGETATION INDEX ; NET PRIMARY PRODUCTION ; CLIMATE-CHANGE ; MOISTURE ; CARBON ; GROWTH ; CHINA ; TEMPERATURE ; RESPONSES ; IMPACTS
刊名: GLOBAL AND PLANETARY CHANGE
发表日期: 2016
DOI: 10.1016/j.gloplacha.2016.10.014
卷: 147, 期:0, 页:40-53
收录类别: SCI
合作性质: 国内
文章类型: Article
英文摘要: Soil temperature and soil water are two important factors controlling vegetation growth. Climate warming and associated permafrost degradation might change these soil conditions and affect alpine grassland on the Qinghai-Tibetan Plateau. However, our current understanding of the role of soil temperature and water at the plateau scale is inadequate. In this study, we used plateau scale soil water content, frozen soil type, vegetation index and land surface temperature datasets to investigate the spatial distribution, limiting factors of vegetation growth and normalized difference vegetation index (NDVI) changing trends in two major alpine grasslands, alpine meadow and alpine steppe, in relation to soil temperature and soil water conditions. Our results showed that: 1) alpine meadow is mainly distributed in seasonal frozen soil areas (55.90% of alpine meadow) with a soil water content between 0.15 and 0.25 m(3)/m(3) and alpine steppe is mainly found in seasonal frozen and sub-stable permafrost areas (69.38% of alpine steppe) with a soil water content between 0.05 and 0.20 m(3)/m(3); 2) at the plateau scale, there were 35.6% (more in colder regions) of alpine meadow pixels and 33.6% (more in wetter regions) of alpine steppe pixels having increase NDVI changing trends during 1982-2012, respectively; and the values having decrease NDVI changing trends are 7.3% and 9.7%, respectively; and 3) the vegetation growth of alpine meadow is mainly limited by soil temperature, while that of alpine steppe is limited by both soil temperature and soil water. We also find the limiting factors of temperature or water can only explain <50% variation of vegetation growth trends in alpine grasslands. Our findings warrant the use of process-based ecosystem models to consider other factors, such as grazing, erosion and soil texture, among others, in addition to soil temperature and water to make proper projections when simulating the responses of vegetation growth to ;climate warming in alpine grasslands with different hydro-thermal conditions. (C) 2016 Elsevier B.V. All rights reserved.
语种: 英语
WOS记录号: WOS:000390518500004
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/7478
Appears in Collections:图书馆_期刊论文

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作者单位: 1.Lanzhou Univ, Key Lab Western Chinas Environm Syst, Minist Educ, Coll Earth & Environm Sci, Lanzhou 730000, Peoples R China
2.Chinese Acad Sci, State Key Lab Cryospher Sci, Cold & Arid Reg Environm & Engn Res Inst, Lanzhou 730000, Peoples R China
3.Chinese Acad Sci, State Key Lab Frozen Soil Engn, Cold & Arid Reg Environm & Engn Res Inst, Lanzhou 730000, Peoples R China
4.Chinese Acad Sci, Key Lab Tibetan Environm Changes & Land Surface P, Inst Tibetan Plateau Res, Beijing 100101, Peoples R China

Recommended Citation:
Wang, XY ,Yi, SH ,Wu, QB ,et al. The role of permafrost and soil water in distribution of alpine grassland and its NDVI dynamics on the Qinghai-Tibetan Plateau[J]. GLOBAL AND PLANETARY CHANGE,2016,147(0):40-53.
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