A study on the relationship between dynamic change of vegetation coverage and precipitation in Beijings mountainous areas during the last 20 years
Beijings mountainous areas have an important ecological significance because they are ecological conservation and water source protection areas of Beijing. The impact of precipitation on the vegetation coverage of Beijings mountainous areas is qualitatively analyzed using multi-temporal Landsat images obtained during the last 20 years. Firstly, the influence of external factors, such as phenology and relative radiometric correction, on the normalized difference vegetation index (NDVI) are removed by the normalization of remote sensing images for different periods. Then, the vegetation coverage is calculated using the method of the dimidiate pixel model. Finally, based on that, the relationship between precipitation in different seasons and change of vegetation coverage is discussed. The results indicate that the mean vegetation coverage has the same change trends with winter and summer precipitation, but an opposite change trend with spring precipitation. The paper provides a theoretical basis and data support for further research on driving models of natural vegetation restoration in Beijings mountainous areas.
Image normalization Vegetation coverage Dynamic change Precipitation Dimidiate pixel model
Xia Jing Wan-Qiang Yao Ji-Hua Wang Xiao-Yu Song
College of Geomatics, Xian University of Science and Technology, Xian 710054, PR China National Engineering Research Center for Information Technology in Agriculture. Beijing 100097, PR C
国际会议
南昌
英文
1079-1085
2010-10-22（万方平台首次上网日期，不代表论文的发表时间）