基于遥感的纸坊沟流域土地利用时空变化分析

Spatial-Temporal Change Analysis of Land Use in Zhifanggou Watershed Based on Remote Sensing

以甘肃省平凉市纸坊沟流域为例,选取1987,2001和2016年3期遥感影像,结合RS和GIS技术,采用基于最大似然法的监督分类与目视解译相结合的方法提取土地利用信息,运用多种土地利用变化指数模型分析讨论了土地利用类型的时空变化特征及成因。研究结果表明:1987—2016年中林地/草地和耕地为纸坊沟流域的主要土地利用类型,耕地和未利用地面积持续减少,林地/草地和建设用地面积持续增加。水土保持工作、经济社会发展和“退耕还林还草”工程等是纸坊沟流域土地利用变化的主要驱动因素。研究为提升流域土地管理水平、保护和改善流域生态环境提供了科学依据。

Taking the Zhifanggou watershed in Pingliang city,Gansu province as an example combing with RS and GIS techniques,using the method of supervised classification based on maximum likelihood method and visual interpretation,the remote sensing images of 1987,2001 and 2016 were selected to extract land use information.The method of supervised classification based on maximum likelihood method and visual interpretation is used to extract land use information and use a variety of index models of land use change to analyze the spatial-temporal variation characteristics and causes of land use types.The results show that the main land use types in the Zhifanggou watershed from 1987 to 2016 are forest land/grassland and cultivated land.The area of cultivated land and unused land continue to decrease,and the area of forest land/grassland and construction land continue to increase.Soil and water conservation work,economic and social development,and the project of“Grain for Green”are the main driving factors for land use change in the Zhifanggou watershed.The study provides a scientific basis for improving the level of land management in the basin,and protecting and improving the ecological environment of the basin.