基于GIS的洞庭湖流域农用地适宜性评价

本文将传统土地适宜性评价的数值计算和GIS图形处理有机地结合起来,以洞庭湖流域为例选取了土壤侵蚀、环境、洪水威胁、气候4个因子作为参评因子,利用成对比较排序法确定各评价因子的权重,然后通过GIS工具运用多因素综合评价方法对洞庭湖流域的农用地进行了适宜性评价;同时考虑研究区的特殊地理区位,对该流域农用地影响较大的自然灾害因子权重加大后重新进行评价并与一般的评价进行比较,获得了较逼真的评价效果.

GIS-based Suitability Evaluation of Agricultural Land inDongting Lake Reg ion

In this paper, the numerical calculation of traditional land suitability evaluation is integrated with GISgraphical p rocession effectively. Taking Dongting Lake Region as an examp le, the soil erosion, environment,threaten of flooding and climate factor are four contestant factor through using paired comparison method to determinethe weight of each factor. Then the multi-factor evaluation method was used to evaluate the agricultural lands whichlocate in the Dongting Lake Region. Moreover, considering the special geographical location, the natural disasterweightwas increased for the reevaluation and itwas compared with the traditional evaluation for drawing some validconclusions.