Plateau Meteorology

Plateau Meteorology >

2014 , Vol. 33 >Issue 2: 301 - 312

DOI: https://doi.org/10.7522/j.issn.1000-0534.2014.00002

Characteristics of Vegetation Change and Its Relationship with Climate Factors in Different Time-Scales on Qinghai-Xizang Plateau

  • WANG Qingxia ,
  • Lü Shihua ,
  • BAO Yan ,
  • MA Di ,
  • LI Ruiqing
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  • Key Laboratory of Land surface Process and Climate Change in Cold and Arid Regions, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;2. University of Chinese Academy of Sciences, Beijing 100049, China

Received date: 2013-07-27

  Online published: 2014-04-28

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Abstract

Using GIMMS NDVI data in the Qinghai-Xizang Plateau(QXP) from 1982 to 2006 and multiple statistical methods, the temporal and spatial characteristics of vegetation change and the relationships between NDVI and climate factors at different time scales (annual, seasonal and monthly) are analyzed. An increasing trend of annual mean NDVI has been shown over QXP. Among all the season, the largest trend of NDVI is in summer, which is about 0.004 per decade. The contribution of different coverage pixel is varied. The pixel change of low vegetation cover dominated the overall change in vegetation, and the largest contribution happens in winter. The pixel change of moderate vegetation cover is significant in autumn, the pixel change of high vegetation cover is more obvious in summer. The change of vegetation cover is not only in temporal, but also in spatial over QXP. The area of increasing and decreasing accounted for 30.51% and 10.52% respectively in summer. Increase region mainly located in the eastern QXP and decrease region located in the northern QXP. With correlation analysis between NDVI and climate factors, the region covered by moderate vegetation has the most relevant to climate factors, followed by the region of high vegetation coverage, and the lowest correlation is in low vegetation coverage area. In the annual and seasonal scales, the cumulative effect of temperature and precipitation controlled vegetation growth in QXP, which is more obvious in vegetation growth well seasons and areas. In monthly scale, vegetation growth in low-moderate vegetation coverage influenced by short-time precipitation events, and the region covered by high vegetation is still dominated by the accumulative effect of temperature.

Key words： Qinghai-Xizang Plate; NDVI; Climate factor

Cite this article

WANG Qingxia , Lü Shihua , BAO Yan , MA Di , LI Ruiqing . Characteristics of Vegetation Change and Its Relationship with Climate Factors in Different Time-Scales on Qinghai-Xizang Plateau[J]. Plateau Meteorology, 2014 , 33(2) : 301 -312 . DOI: 10.7522/j.issn.1000-0534.2014.00002

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