基于GIS的凉州区醇用型甜高粱适宜性等级预测研究

Study on Suitability Grade of Alcohol Type Sweet Sorghum in Liangzhou Area by GIS

以武威市凉州区土壤图、土地利用现状图、行政区划图和地貌类型分区图叠加形成评价对象单元,选取对研究区耕地生产力影响较大、与农业生产有密切关系,并且具有区域差异明显、时间序列上相对稳定特征的8个因子,建立评价指标体系;建立层次分析模型,进行综合指数计算分析。预测研究结果表明:参评因子中,对研究区醇用型甜高粱种植适宜性等级的影响程度从大到小依次为:灌溉保证率、土壤类型、成土母质、灌溉模数、剖面构型、海拔、有机质、速效钾。凉州区醇用型甜高粱适宜性评价为4个等级,分级标准取值(IFI)为0.7825、0.5356和0.4219,对应区域为一级适宜、二级适宜、三级适宜和四级适宜,其面积分别为43806 hm^2、21207 hm^2、16071 hm^2和16198 hm^2。

The soil map and present landuse map, administrative zoning map and landform zoning map of Liangzhou district of Wuwei city were overlaid forming evaluation object unit, eight factors with obvious area differences and relatively stable time series were used to establish evaluation index system and AHP model. The results showed that the prediction of the evaluating factors, the influence degree of study area on suitable planting alcohol type sweet sorghum was as follows： the guaranteed rate of irrigation〉 soil type〉 soil parent material 〉 irrigation modulus〉 profile configuration〉 altitude〉 organic matter〉 available potassium. Suitability evaluation of alcohol type sweet sorghum are classified into four grades in Liangzhou district, and the standard values was 0.7825, 0.5356 and 0.4219, corresponding to the suitable region of one, two, three and four degree, whose area was 43806 ha, 21207 ha, 16071 ha and 16198 ha, respectively.