贵州省大坝土地利用变化及驱动力分析

选取贵州省万亩（1亩=1/15 hm2）以上的坝子为研究对象，以GIS为技术支撑，通过空间叠加分析，提取研究区10 a来的土地利用/覆被信息，并结合相应的社会经济统计数据，进一步分析引起变化的驱动力影响因子。结果表明：（1）2000~2005年、2005~2010年两个时段，耕地面积一直在持续减少，第二时段的变化比第一时段更剧烈；林地、城镇建设用地、农村居民点、水域、道路在两个时段都不同程度的增加，其中城镇建设用地、农村居民点在第二时段比第一时段增加的速度更快，其它3种地类增加的速度有所减缓；灌木总体变化是出现先减后增的趋势；（2）耕地在2000~2005年的流向主要是林地，在2005~2010年流向主要是居民点和城镇建设用地；（3）研究区土地利用变化受人口、经济效益、政策的影响

ANALYSIS OF LAND USE CHANGE AND DRIVING FORCE IN GUIZHOU

Understanding land use change and associated driving forces is fundamental for optimizing land use and providing scientific basis for sustainable utilization of land resources We selected the basins that are larger than 10 000 mu in Guizhou Province in the present study Using GIS techniques and spatial analysis，land use/ over information of recent 10 years was extracted and the cause of changes was further studied With support of socioeconomic data，the results showed that the area of cultivated land continually reduced and the second study period （ie，2005-2010） was severer than the first （ie，2005-2010）. The decreased cultivated lands were 7 87473 hm2 and 10 52173 hm2，showing an continuous reducing trend In the two temporal phases，forested lands，urban construction lands，rural residential areas，water，and roads increased in different degrees Meanwhile，urban construction lands and rural residential areas in the second temporal phase increased much faster than the first one，while the other three type of lands increased more slowly Shrublands were firstly decreased and then increased Cultivated lands were mainly turned to woodlands from 2000 to 2005，and mainly to rural residential areas and urban construction lands from 2005 to 2010 The variation of cultivated land was the major characteristic of land use change in the study area There are two possible driving forces of these land changes The first one was state policy （such as the urbanization promotion and new rural construction）. The second one was increasing mining and traffic flow Using principal component analysis，we classified and standardized 10 factors The results showed that land use change in study area was affected by population，economic benefits and policy An increasing population led to urban construction and increasing rural residential areas Land use intensity should be enhanced to meet the increasing population and the rising consumption demand Policy also had an impact on the land useHJ1]HJ]