铜川市土地利用/土地覆被动态变化研究

采用铜川市1987年和2002年两期TM遥感影像对该市的土地利用/土地覆被动态变化进行了研究。并结合遥感技术和地理信息系统技术,采用监督分类方法提取土地利用类型信息,分析了铜川市土地利用的数量变化特征和空间变化特征。研究结果表明,铜川市植被覆盖率(包括乔木林,灌木林,草地)由1987年的54.52%增加为2002年的64.46%,增加了近10%,退耕还林工程的实施在该区获得了显著成效;此外铜川市居民地面积增加了近1倍,主要由耕地转化而来,表明城市扩张占用耕地现象严重。

Dynamics of Land Use/Cover in Tongchuan City of Shaanxi Province

The dynamics of land use and land cover in Tongchuan City,Shaanxi Province were analyzed based on TM remote sensing images of 1987 and 2002.Together with remote sensing(RS) and geographic information system technology,information regarding land use types was obtained using the supervised classification method.The characteristics of quantity and spatial variations of land use were further analyzed based on collected information.The results indicate that the percentage of vegetated land(woods,shrubbery,and grassland) increased from 54.52% in 1987 to 64.46% in 2002,approximately an increase of 10 %,implying significant achievements resulted from the project of Grain-to-Green project.Furthermore,the total area of residential land,transferred mainly from cultivated field,almost doubled during the period,showing a serious land use problem of cultivated field depletion owing to urban expansion.