定西市土地利用变化及驱动力分析

Analysis of land use change and driving forces in farm-ingpastoral ecotone-take Dingxi as an example

摘要:

为探讨土地利用变化的影响因素,选取定西市1980、1990、2000、2010和2018年5期的遥感影像数据及统计年鉴数据,采用ArcGIS空间分析方法和主成分分析法对近38年土地利用结构和驱动力进行了研究。结果表明:研究期内定西市土地利用以草地为主,建设用地的单一土地利用动态度最大;土地利用程度综合指数处于中低等水平,人为利用程度低。总体来看,耕地逐年减少,净转化面积最大,主要转化为林地、草地和建设用地;人民生活、农业及经济发展水平是影响定西市土地利用变化的主要驱动力。

Abstract:

This study aimed to explore the factors influencing land use using remote sensing image data and annual statistical data of Dingxi City in 1980,1990,2000,2010 and 2018.ArcGIS spatial analysis method and principal component analysis method were used to study the land use structure and driving forces in recent 38 years.The results showed that during the study period,the land use of Dingxi City was mainly comprised of grassland.There was most significant change in construction land.The comprehensive index of land use was at the middle and low level,and the degree of human use was low.Overall,the cultivated land has been decreasing annually which had the greatest net conversion area,primarily due to its convertion into woodland,grassland and construction land.The level of people's living,agriculture and economic development were the main driving forces affecting land use change in Dingxi City.