Spatial distribution of land cover and vegetation activity along topographic gradient in an arid river valley, SW China

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• 作者：Wen Liu (1) (2) (3)
  Xianli Xu (2) (4)
  Jiancheng Luo (3)
  Zhanfeng Shen (3)
  Qiuhai Zhong (1)
  
• 关键词：Vertical distribution of land cover ; Anthropogenic activity ; Vegetation activity ; Environmental variability ; China
• 刊名：Journal of Mountain Science
• 出版年：2009
• 出版时间：September 2009
• 年：2009
• 卷：6
• 期：3
• 页码：274-285
• 全文大小：287KB
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• 作者单位：Wen Liu (1) (2) (3)
  Xianli Xu (2) (4)
  Jiancheng Luo (3)
  Zhanfeng Shen (3)
  Qiuhai Zhong (1)
  
  1. Department of Automatic Control, School of Automation, Beijing Institute of Technology, Beijing, 100081, China
  2. State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
  3. Institute of Remote Sensing Applications, Chinese Academy of Sciences, Beijing, 100101, China
  4. Centre for Hydrology, Micrometeorology and Climate Change, Department of Civil and Environmental Engineering, University College Cork, Cork, Ireland
  
• ISSN：1993-0321

文摘

Anthropogenic activities have become more and more important in characterizing the landscape, but their impacts are still restricted by natural environments. This paper discusses the interactions of anthropogenic activity, vegetation activity and topography through describing the spatial distribution of land cover and vegetation activity (represented by Normalized Difference Vegetation Index, NDVI) along topographic gradient in a mountainous area of southwestern China. Our results indicate that the existing landscape pattern is controlled by anthropogenic activities as well as topographic factors. Intensive anthropogenic activities mainly occur in areas with relatively low elevation, gentle and concave slopes, as these areas are easy and convenient to attain for human. Because of the destruction by human, some land cover types (mainly grassland and shrub) are only found in relatively harsher environments. This study also finds that topographic wetness index (W) used in other places only reflects runoff generation capacity, but not indicate the real spatial pattern of soil water content in this area. The relationships between NDVI and W, and NDVI and length slope factor (LSF) show that runoff and erosion have complex effects on vegetation activity. Greater values of W and LSF will lead to stronger capacity to produce runoff and transport sediment, and thereby increase soil water content and soil deposition, whereas beyond a certain threshold runoff and erosion are so strong that they would destruct vegetation growth. This study provides information needed to successfully restore native vegetation, improve land management, and promote sustainable development in mountainous areas, especially for developing regions.