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采用GIS技术和层次分析法、综合指数法等,对青海省乐都县耕地地力进行科学评价。结果表明,全县24 982.44hm2耕地可分为5级,其中,一等地IFI(地力综合指数)>0.814,面积为858.29hm2,占总面积的3.44%;二等地IFI 0.660～0.814,面积3 621.80hm2,占14.5%;三等地IFI 0.455～0.660,面积8 002.61hm2,占32.03%;四等地IFI 0.390～0.455,面积9 236.56hm2,占36.97%;五等地IFI<0.390,面积3 263.85hm2,占13.06%。并采用归纳法,建立了包含立地条件、理化性状和土壤管理等地力要素的乐都县耕地地力评价指标体系。
Using GIS technology and analytic hierarchy process, comprehensive index method and so on, to conduct a scientific evaluation of cultivated land productivity in Ledu County, Qinghai Province. The results showed that 24 982.44 hm2 of cultivated land in the whole county can be divided into 5 grades, of which, first class IFI (general composite index)> 0.814, area 858.29hm2, accounting for 3.44% of the total area; second class IFI 0.660 ~ 0.814, area 3 621.80hm2, accounting for 14.5%; third class IFI 0.455 ~ 0.660, area 8 002.61hm2, accounting for 32.03%; fourth class IFI 0.390 ~ 0.455, area 9 236.56hm2, accounting for 36.97%; fifth class IFI <0.390, area 3 263.85hm2, accounting for 13.06%. And inductive method was used to establish the evaluation index system of cultivated land productivity in Ledu County, which includes the site conditions, physical and chemical properties and soil management.