F_Etitle Study on dynamic change of vegetation coverage in Yulin city based on RS and GIS
WANG Xiaofeng1，2, REN Zhiyuan2
(1 College of Earth Science and Land Resourses, Chang′an University, Xi′an, 710061, Shaanxi, China; 2 College of Tourism and Environment, Shaanxi Normal University, Xi′an 710062, Shaanxi, China)
Abstract:
Vegetation is the main component of terrestrial ecosystem, it includes all plant communities that cover the earth surface. Supported by the field investigation data in Yulin city, the paper evaluates the vegetation in the district dynamically. The results show that: From 1988 to 2002, according to the proportion of various types, the areas of very high, high and middle vegetation coverage increased in a certain degree, and other various types of vegetation coverage decreased. And the main part is low vegetation coverage in Yulin city. In addition to the policy in the human factors, the rainfall in the natural factors is the one that can not be overlooked.
KeyWords:
Yulin city; vegetation coverage; dynamic change; RS and GIS
