渭河流域土地利用变化特征及驱动力分析

Characteristics and Driving Forces of Land Use Change in Weihe River Basin

基于GIS和RS技术,通过1990年、2000年、2005年、2010年的土地利用现状图,定量分析渭河流域土地利用动态变化及其自然因素和人类活动的驱动作用。研究表明:1990—2010年,渭河流域的土地利用类型以草地、耕地、林地为主;在自然和人类活动综合作用下,土地利用类型以草地、林地、耕地和建筑用地之间的相互转化为主;耕地、未利用地、湿地占比呈逐渐减少趋势,草地和林地占比呈增加趋势;自然条件制约土地的开发利用程度,人类活动尤其是宏观政策影响土地利用的结构与方式。

On the basis of remote sense data of land use in 1990, 2000, 2005 and 2010, the characteristics of the land use changes （LUCC）in the Weihe River by using GIS and RS technical platform were quantitatively analyzed, and the driving forces of LUCC were discussed fromthe two aspects of the nature and human factors. The results show that the grassland, cropland and forest are the main land use/cover types inthe Weihe River basin in 1990-2010. Grassland, farmland, forest and building land are transformed reciprocally. There is a decreasingtendency in the proportion of farmland, unused land and wetland, while the proportion of grassland and forest is increasing. Extent of land usedevelopment is restricted by nature factor. The structures and ways of land use are influenced by human activities and macroscopical policies.