The indexes of soil organic content, soil texture, stony desertification degree, soil thickness, gradient, slope aspect, irrigation condition, precipitation and elevation of arable land were analyzed to establish the evaluation model of arable land suitability by using GIS and weighted index method for suitability evaluation and sustainable development of arable land in small watershed of Shigu river, Pu'an county, Guizhou and to provide the scientific basis for development and management of arable land in Karst areas. The results showed that the area of highly suitable land in the area was 283. 55 hm2, accounting for 24. 60% , while the area of marginally suitable land and unsuitable cultivation accounted for 50.07% of total arable land area. The feature of low organic matter content, steep slope, thin soil thickness, high bare rock proportion and heavy soil erosion causes poor quality and less amount of arable land in small watershed of Shigu river, Pu'an county, Guizhou.%为喀斯特地区耕地的开发和管理提供依据,以贵州省普安县石古河小流域为例,选择有机质含量、土壤质地、石漠化等级、土层厚度、坡度、坡向、灌溉条件、降水量和海拔等指标为参评因子,采用GIS与加权指数法结合的耕地适宜性评价模型,对该研究区的耕地适宜性与可持续发展进行了评价和研究.结果表明:区域内高度适宜耕地283.55 hm2,占耕地面积的24.60％；边际适宜耕地和不适宜耕地占耕地面积的50.07％.耕地质量差,数量少,多表现为有机质含量低,坡度大,土层薄,裸岩比例高,土壤侵蚀重.
展开▼
