基于GIS的云南保山西庄山地流域土地利用变化研究

Land use change study based on GIS in Xizhuang Mountain watershed of Baoshan, Yunnan

对1982,1991,1998年云南保山西庄山地流域土地利用图利用GIS技术进行了处理,分析了土地利用程度变化值和土地利用动态度。结果显示:西庄河流域土地利用以林地为主;林地、灌草地和耕地相互转换最为频繁,年变化率分别为6.94%、4.75%和2.99%;茶园的变化最小;综合土地利用变化动态度为1.91%;在土地利用方式的变化中,国家政策是最强有力的影响因子,相反,人口增长没有直接影响到土地利用变化。

With the use of GIS, landuse map of Xizhuang Mountain watershed in 1982,1991 and 1998 was compiled. The paper analyzes the land use change degree and land use dynamic degree in three years. Results show forest is mainly land use, and forestland, grassland and shrub land, and farmland are interchanging very often during last 16 years, and annual change rate for forest, grass and shrub, and farmland is 6.94%, 4.75% and 2.99%, respectively. However, tea garden remains few change. The integrated annual change rate from 1982 to 1998 is 1.91%. Among the driving forces of land use change, policy is proved to be most powerful. Populatin growth, contrarily, has no direct impact on land use change.