基于GIS的辽阳县耕地地力评价研究

Research on Evaluation of Soil Fertilities of Farmland in Liaoyang County Based on GIS

采用综合指数法对辽阳县耕地地力进行评价。样点数共计4176个,在GIS支持下,将辽阳县土壤图、行政区划图、土地利用现状图进行叠加分析,确定评价单元6933个,采用模糊评价、特尔斐法、层次分析法等,对土壤管理、耕层养分形状、耕层理化性状、剖面性状这4方面12个影响因子进行分析,并建立耕地地力评价体系及其模型。结果表明:全县耕地地力等级可分为5等,其中,一等地有7181.92hm2、二等地有28570.76hm2、三等地有41425.70hm2、四等地有14778.67hm2、五等地有4873.65hm2,分别占辽阳县耕地总面积的7.42%、29.51%、42.78%、15.26%和5.03%。

On the basis of the geographic information system （GIS）, totally using 4 176 sample points, overlaying analysis is made on the current landuse map with the administration map and the soil map, forming 6 933 patches, which are used as the basic management and evaluation cells .This research selected twelve influencing factors from four aspects such as land management, soil nutrient content, physical and chemical situation and profile situation, and the evaluation system and model of farmland tertility was build up. The grade of arable land productivity was formed according to the theory of Fuzzy Mathematics; Telphi Principle and Analytic Hierarchy Program, and the farmland fertility in liaoyang country and analysis of its spatial distribution were evaluated. The resuhs suggest all farmlands could be divided into five grades, the grade one was 7 181.92 hm2, the grade two was 28 570.76 hm2. The grade three was 41 425.70 hm2,the grade four wasl4 778.67 hm2, the grade five was 4 873.65 hm2 ,the fertility of grade one to five account for 7.49%, 29.51%, 42.78%, 15.26%, 5.03% respectively.