基于GIS技术的平昌县域耕地地力评价

Evaluation of Farmland Productivity in Pingchang County Based on GIS Technology

为了解全县耕地地力现状,为耕地资源的高效和可持续利用提供科学依据,在GIS支持下,利用比例尺为1:50000的行政区划图、土地利用现状图和土壤图叠置划分法确定评价单元,选取立地条件、耕层理化性状、土壤管理3个方面12个影响因子建立耕地地力评价体系及其模型,采取专家打分和特尔斐法确定各影响因子的隶属函数,运用层次分析法和模糊数学方法对平昌县耕地地力进行综合评价,并分析其空间分布。结果表明,在平昌县40952hm2耕地中,一～六等地分别占耕地的8.2%、20.3%、19.6%、35.4%、8.2%、8.3%,这一结果符合当地实际。

In order to understand the current situation of county cultivated land,provide the scientific basis for the efficient and sustainable use of arable cultivated land resources,based on GIS technology,using the scale of 1：50000 administrative zoning,1and utilization map and oil distribution map into the evaluation method for unit,this research selection of site conditions,physical and chemical properties,soil management were three aspects influencing factors and establish the cultivated land fertility evaluation system and its model,expert scoring and Delphi method were used to determine the influence factor of membership functions by using analytic hierarchy process and fuzzy mathematical method to evaluate the Farmland Productivity in Pingchang County,and analyzed the space distribution.The results showed that,40952 hm 2 of arable land,the fertility of the grade first to sixth account for 8.2%,20.3%,19.6%,35.4%,8.2%,8.3%,which were in line with the 1oca1 situation of the county.