基于GIS技术，将象山县土壤图、土地利用现状图及行政区划图相叠置，确定全县耕地地力评价单元985个。根据象山县实际情况和浙江省确定的15个耕地地力评价因子，采用层次分析法，确定各评价因子权重和隶属度，根据综合地力指数等级将耕地划分为三等六级。评价结果显示：目前县内现有耕地20742 hm2，其中一等耕地全为二级，面积为458 hm2，占总面积的2.21％；三级耕地面积为13337.3 hm2，占总面积的64.30％，四级耕地面积为6712.6 hm2，占总面积的32.36％；五级耕地面积为234.1 hm2，占总面积的1.13％。%Based on the GIS technology , the soil map, current land use map and administrative map were overlapped to define the 985 assessing units of the county .Fifteen assessing factors were chosen in view of the actual situation of the county and land fertility assessing factors of Zhejiang Province , and the analytical hierarchy process was employed to define the weights and membership of each factor , then the land was classified into three grades and six levels ac-cording to the integrated fertility index .The results showed that the existing land covered an area of 20742 hm2 .The first grade land all belonged to the second level , and the area was 458 hm2 , 2.21%of the total area;the area of the third level was 13 337.3 hm2 , 64.30%of the total area;the area of the fourth level was 6 712.6 hm2 , 32.36%of the total area , and the area of the fifth level was 234.1 hm2 , 1.13%of the total area .
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