中文摘要：

为了对关中平原台塬区土壤肥力进行综合评价,在野外调查采样和室内化验分析基础上获得了土壤肥力各要素数据信息,选取了有机质、碱解氮、有效磷、速效钾以及pH值5项评价指标,首先根据隶属函数模型及层次分析法确定各评价指标隶属度和权重,进而采用加法模型计算土壤肥力综合指数（IFI）,最后利用ArcGIS9.3软件对土壤肥力进行分级,实现了土壤肥力综合评价定量化、自动化.根据利用模糊评价模型方法获得的研究区土壤肥力等级面积、分布信息及不同地貌类型的肥力状况进行分析.结果表明：研究区内肥力总体呈现出南高北低的趋势,洪积平原区的肥力状况较好,其余地貌类型区土壤肥力属中等水平.模糊评价模型方法在进行土壤肥力评价时可以取得较为直观实用的结果,同时也为综合评价土壤肥力提供有力的技术支撑.

英文摘要：

Based on the plentiful information obtained by field-survey, soil sampling and lab analysis were conduct- ed to evaluate the soil fertility in Guanzhong Plain and the Loess Plateau. According to interrelated principles, 5 evaluat- ing indexes were chosen, such as OM, AN, AP, AK and pH. The automatic and quantitative evaluation procedure was realized by adopting the principle of hierarchy analysis and fuzzy mathematics which were supported by GIS techniques. The information about the area and the spatial distribution of soil fertility grades in different geomorphic types acquired by fuzzy comprehensive appraisal method revealed a general trend of high soil fertility in northern areas and low fertility in southern areas. The results indicated that the fuzzy appraisal method made the results visual and practical and could provide strong technical support for comprehensive evaluation of soil fertility.