干旱内陆河流域土地利用程度差异分析——以张掖市甘州区为例

Analysis of land use difference degree in arid inland river basin——Taking Zhangye,Ganzhou District as an example

干旱内陆河流域土地自然环境恶劣、生态环境脆弱,人类活动所造成的危害较大。研究干旱内陆河流域土地利用程度及其区域差异,可为土地利用合理开发及土地利用规划提出理论依据。采用G IS技术和土地利用综合分析方法,以甘州区为研究对象,运用土地利用程度综合指数模型、土地利用程度变化模型和土地利用变化区域差异模型对土地利用程度及区域差异进行分析研究。结果表明:2005年全区土地利用程度指数平均为255.25,土地利用程度整体处于一个中等偏上水平,但是各乡镇的土地利用程度参差不齐,土地资源有待进一步开发利用;土地利用处于发展时期,甘州区大部分乡镇土地利用程度变化量和土地利用程度变化率大于零,土地利用变化差异较大;土地利用程度依地形地貌特征差异分布,土地利用程度高的区域集中于中部平原,而南北两侧山地区域的土地利用程度较低。

The land in arid inland river basin is exposed to harsh natural environment, where the ecological envi- ronment is fragile, human activities caused great harm. Researching arid inland river basins and their regional differences in the degree of land use can give the theoretical basis for reasonable development of land use and land use planning. Taking Ganzhou District as an example, we used G1S technology and comprehensive analysis method, composited index with a model of land use degree, land use change models and the extent of regional differences in land use change model to analyze the extent of land use and regional differences. The results showed that in 2005 the average land use degree index an of the whole region was 255.25, the overall level of land use was at a medium level, but the villages and towns land use levels were not the same, needing further development and utilization of land resources, and land use was in the development period. In Ganzhou District most of the villages and towns land use degree changed and land use degree change rate were greater than zero, land use varied quite differently; Land use degree distributied according to different characteristics of topogra- phy, a high degree land use was focused on the central plains region, and north and south sides of mountainous areas were in the lower level of land use.