关键词: 表土剥离, 中低产田改造, GIS空间分析, 长沙市

Abstract: Under the circumstance that the cultivated land occupied by new construction land increases year by year, the method of stripping the soil occupied by construction of high-quality tillage layer is adopted to improve the middle and low yield fields, so as to improve the quality of middle and low yield fields and effectively protect cultivated land resources. With five districts and counties of Changsha city as the scope of research, based on the results of Changsha city’s land use status and overall planning data, cultivated land fertility data and others, the GIS spatial analysis and literature research are adopted to measure, evaluate and analyze the quantity and distribution of the medium-low-yield fields and the topsoil that can be stripped. The results showed that the theoretical volume of strippable topsoi is 15 118 600 m³, the volume of soil required to improve the low-yield fields is 37 413 100 m³, the supply of topsoil is far less than the demand. The potential of medium-low-yield fields is 60 195.11 hm², mainly distributed in Changsha county, Ningxiang city and Liuyang city; While the area of the strippable topsoil is 8 835.26 hm², mainly distributed in Yuelu district, so the supply and demand are unevenly distributed in space.

Key words: topsoil stripping, reform of medium-low-yield fields, GIS spatial analysis, Changsha city