Grassland change monitoring and driving force analysis in Xilingol League
ZHAO Ru-bing1,2, XIAO Ru-lin2, WAN Hua-wei2, LIU Hui-ming2, GAO Shuai3, LIU Si-han2, FU Zhuo2, TAN Chang2, WEN Rui-hong2, TANG Hao-jun2,4
1. College of Geoscience and Surveying Engineering, China University of Mining & Technology(Beijing), Beijing 100083, China; 2. Satellite Environment Center, Ministry of Environmental Protection, Beijing 100094, China; 3. Institute of Remote Sensing Application Chinese Academy of Sciences, Beijing 100101, China; 4. School of Environment & Natural Resources, Renmin University of China, Beijing 100872, China
Abstract：Grassland change monitoring and driving force analysis based on long time data series are important for the protection of the arid and semi-arid grassland ecological environment in Xilingol League. Under the background of national economic development, governance of Beijing-Tianjin sandstorm source area and national implementation of pastureland rehabilitation, by using RS and GIS, remote sensing image data was selected as the data source to discuss NDVI variation of grasslands in Xilingol League from 2000 to 2013 and to analyze driving force of grassland change from aspects of land use, meteorological conditions and human activities. During 2000~2013, grassland quality in Xilingol League had been improved in general and about 4.04% of the region had changed. Most grassland change areas were significant or weak increases, and only about 3.93% degraded in central areas of Xilingol League (shown in northeast-southwest distribution pattern), especially in Southeast Sonid Left Banner, Central Xilinhaote City and Northeast Xi Ujimqin Banner. The results indicate that grassland change had rather weak correlation with temperature, but had significant correlation with precipitation and human activities. In grassland degradation areas showed above, changes of temperature and precipitation on the annual NDVI maximum had no significant effect (P>0.1). Grassland degradation areas in Xilinhaote City and Xi Ujimqin Banner were distributed within 8km of the mining area, especially in mining area of Xi Ujimqin Banner. It reflects the change of temporal and spatial distribution of grassland in Xilingol League, and expounds the driving factors that caused the changes. The result of the study can be helpful for the Xilingol Grassland Ecological protection supervision management work. At the same time, relevant technical methods used in the study can also provide a good guidance for other regional ecological change monitoring and analysis.
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