基于GIS的蚌埠市淮上区耕地地力等级评价

借助遥感解译和GPS野外采样,获得安徽省蚌埠市淮上区田块尺度的评价单元和2 642个土壤采样点。应用GIS的空间分析功能,利用DELPH法、层次分析法和模糊评价等模型,以耕地的养分状况、理化性质、地理条件、管理状况4个方面和17个影响因素为主要评价依据,建立了评价模型。采用积累曲线法确定地力等级评价界限,将淮上区2万多块评价单元划分为5个等级。一等地和二等地主要集中在曹老集镇,其中分别占一等地的96.89%,二等地的70%,三等地和五等地在梅桥乡分布较多,分别占三等地的47.08%,五等地的61.37%,而沿淮河的小蚌埠镇和吴小街镇主要是三等地和四等地。地力等级评价结果能准确反映当地耕地的状况,为淮河流域耕地地力等级评价提供依据。

Gradation of the Cropland Productivity in Huaishang District Bengbu City Based on GIS Technique

The evaluation units was obtained and 2600 soil sampling points which located in the area of Huaishang district of Bengbu, Anhui Province . field scale via remote sensing interpreting and sampling point arrangement that is based on GPS. In the meantime, depending on the nutrient status of arable lands, physicochemical property, geographical condition, management situation and 17 factors, we have established a relatively scientific evaluation model which has assisted by spatial analysis of GIS, DELPH method, AHP and fuzzy assessment. Adopting accumulation curve method to determine the fertility level of the evaluation limits, we incise the 2000 evaluation units of the upper areas into 5 classes. After exploration, the evaluation results of fertility level have been believed that they can reflect accurately the status of local farmlands, which can prove that the assessment of the fertility level of Huaihe is reliable.