丹江口库区1990—2010年土地利用时空动态变化研究

A Spatio-temporal Analysis of Land Use Changes in Danjiangkou Reservoir Area during 1990—2010

以Landsat TM和HJ-1影像为数据源,运用CART(classification and regression tree)决策树分类方法提取了丹江口库区1990,1995,2000,2005,2010年的土地利用信息,在此基础上采用土地利用转移矩阵、土地利用动态度和单一土地利用类型相对变化率等评价指标全面分析了丹江口库区1990—2010年土地利用时空变化情况,并对土地利用变化的主要原因进行了探讨。研究表明:1990—2010年丹江口库区土地利用变化主要表现为灌木大量转化为林地,耕地大量转为草地、灌木、建设用地、林地和园地;库区地质地貌、降雨条件、生态建设工程、经济利益、库区工程建设、移民安置和城镇迁建以及城市化的发展是丹江口库区土地利用变化的主要驱动因素。丹江口库区土地利用变化研究为库区生态环境建设和土地可持续利用提供有效的决策支持。

This paper illustrates the results of land use change and its driving forces in Danjiangkou Reservoir Area using muti-temporal remotely sensed data from 1990 to 2010. The decision tree classification technique was used to extract land use information from Satellite data. And the classification and regression tree （CART） method was applied to build the decision tree. The analysis indicated that woods and grass expansion of Danjiangkou Reser- voir Area resulted in the reduction of shrus and cultivated land from 1990 to 2010. Ecological construction and con- ditions of geology, geomorphy and rainfall were the two main factors that affect the land use change of Danjiangkou Reservoir Area. The study quantified the patterns of land use change and its driving forces in Danjiangkou Reservoir Area for the past 20 years, it forms valuable resources for decision makers to devise strategy for sustainable use of land.