基于RS和GIS的榆林市植被覆盖度动态变化研究

Study on dynamic change of vegetation coverage in Yulin city based on RS and GIS

植被覆盖度是反映区域生态环境状况的一个主要因素,进行植被覆盖度研究是目前国际研究的主要内容和热点内容.该研究以遥感数据为主要数据源,以榆林市为研究对象对其植被覆盖度进行动态评价,结果表明:从1988—2002年,各类型的面积在整个时间段的变化趋势是极高覆盖度、高覆盖度和中覆盖度都有一定的增加,而其他各类型的植被覆盖呈下降态势.榆林市植被覆盖度是以中低覆盖度为主体.影响其变化的原因主要除政策制定与实施等人文因素,降水量等自然因素是一个不可忽视的影响因子.

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.