DOI: 10.1016/j.gloplacha.2016.10.014
论文题名: The role of permafrost and soil water in distribution of alpine grassland and its NDVI dynamics on the Qinghai-Tibetan Plateau
作者: Wang X. ; Yi S. ; Wu Q. ; Yang K. ; Ding Y.
刊名: Global and Planetary Change
ISSN: 0921-8181
出版年: 2016
卷: 147 起始页码: 40
结束页码: 53
语种: 英语
英文关键词: Alpine grassland
; Climate warming
; Limiting factor
; NDVI change
; Permafrost
Scopus关键词: Atmospheric temperature
; Climate change
; Climate models
; Frozen soils
; Permafrost
; Pixels
; Soil moisture
; Temperature
; Vegetation
; Alpine grasslands
; Climate warming
; Land surface temperature
; Limiting factor
; NDVI change
; Normalized difference vegetation index
; Process-based ecosystem model
; Qinghai-Tibetan plateau
; Soils
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 m3/m3 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 m3/m3; 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. © 2016 Elsevier B.V. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84994226187&doi=10.1016%2fj.gloplacha.2016.10.014&partnerID=40&md5=56019f1fec5b7fca54a5157eadf87f81
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11592
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: Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, China
Recommended Citation:
Wang X.,Yi S.,Wu Q.,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,2016-01-01,147.