苏州市非农用地扩张与土壤质量的空间相关性

基于1984、1995、2000及2003年4期TM遥感影像获取的苏州市非农用地扩张数据以及该市土壤质量综合评价图层，通过叠加分析得到了研究区非农用地扩张在土壤质量等级上的分布规律．结果表明：研究期间苏州市非农用地占用的都是高质量的土壤资源；其中以二等质量的土壤为主，占90％以上，其次为一等质量的土壤资源，而对三、四等低质量土壤的占用率不到1％．从土壤质量的角度而言，目前耕地“占补平衡”的观点值得商榷．

Spatial correlation between non-agricultural land expansion and soil quality in Suzhou City

Based on the layer of non-agricultural land expansion interpreted from 4 Landsat TM images in 1984,1995,2000 and 2003 and the soil quality map,the patterns of non-agricultural land expansion occurring on soil quality levels in Suzhou City were analyzed.It was indicated that the non-agricultural land expansion happened mainly on the soils with high quality during 1984-2003.90% of the expansion took place on the soils with moderately high quality(grade 2),and the next was those with high quality(grade 1).In the meanwhile,the expansion on the soils with moderate(grade 3) and low quality(grade 4) was only less than 1% of total area.From the viewpoint of soil quality,we should ponder more over the opinion on "dynamic balance of total amount of arable land between occupying and supplementing".