GIS支持下的农业土地资源评价研究—以贵阳市区为例

本文基于土地质量评价的“压力－状态－响应”（PSR）模型，选取土壤重金属污染作为评价的一个压力为指标，应用GIS对贵阳市区农业土地资源进行了综合质量评价。定量评价的结果表明，区域农业土地资源中大部分土地资源重较好，但旱地和水田共有17．11km^2的重金属重度污染区，这部分耕地已不适宜种植农作物，同时，适合人类耕作的高质量耕地由于土壤重金属污染减少了近1／3，说明贵阳市区进行土壤重金属污染防治具有重要的意义。

AN AGRICULTURAL LAND RESOURCE EVALUATION STUDY BASED ON GISAS EXEMPLIFIED BY GUIYANG CITY

On the basis of the pressure\|state\|response model, heavy metal contamination of soil was selected as a pressure index of evaluation, and the agricultural land resources of Guiyang City were evaluated by means of GIS. The conclusions show that most of the agricultural land resources are of good quality. However, the dry land and paddy field covering an area of \{17.11\} km\+2 are contaminated seriously heavy metals, which are not fit for growing crops. At the same time, the high\|quality plowland, which is suitable for cultivation, has decreased by about 1/3 owing to soil heavy metal contamination. These show that it is very important to prevent and hardness heavy metal contamination of Guiyang City.