基于"3S"的云南省石屏县土地利用动态特点分析

利用土地利用电子数据和SPOT-5卫星遥感数据,在3S技术的综合应用基础上对石屏县1992、2005年两个时期土地利用变化进行了研究。研究表明:①1992年至2005年,研究区园地变化速度较快,动态度达到了20.23%。未利用土地面积减少18865.48 hm2,耕地、林地面积分别增加了7143.22和6057.07 hm2。但由于未利用土地、耕地、林地在研究初期面总量较大,动态度较小。②在研究时段内,该区土地利用动态转化过程中以耕地、林地、未利用土地三者之间的转化、耕地、林地、未利用土地转化为园地,耕地、林地转化为居民用地及工矿等11种转化为主。③该区土地利用综合指数1992年为193.19,2005年为204.49,土地利用处于发展期,但与全国土地利用综合指数220相比有一定的差距。④农业产业结构调整、地方政府政策导向以及城镇建设用地的扩展等是影响研究区耕地变化的主要原因。

3S-based study on dynamic change of land use in the Shiping county

Using land use database and satellite SPOT-5 data,analyzed the land use dynamic change in Shiping county during 1992 and 2005 on 3S.The conclusions were drawn as follows:(i) During 1992 and 2005,garden land changed fast,and its dynamic degree reached 20.23%.The unused land reduced 18865.48 hm2.The forestland increased 7143.22 hm2 and farmland increased 6057.07 hm2.Because of the area were bigger in ex-a time,the dynamic degree in farmland,forestland and unused land is smaller.(ii) The dynamic land use change is mainly characterized by that farmland,forestland and unused land were transformed mutually,and farmland,forestland and unused land were transformed as garden land,and farmland and forestland were transformed as residential ground.(iii) The degree of synthetic land use is lower than national's,but it increased from 193.19 to 204.49 during 1992 and 2005.(IV) The farmland change in the study area is mainly caused by agriculture structure adjusts,government policy and urbanization.