【摘要】 根据模糊数学和多元数理统计分析原理 ,建立了一个定量的土壤肥力综合评价方法 ,并应用于大比例尺样区的土壤肥力综合评价。首先 ,通过野外调查和室内理化分析 ,选取了 9项评价指标 ,包括全 N、全 P、全 K、速效P、速效 K、物理性粘粒、粉粘比、表土层厚、p H;并根据植物效应建立两类隶属度函数 ,分别计算出隶属度值 ;然后 ,利用 AHP法确定各因子的权重 ,根据隶属度值和权重 ,求出各参评指标的分值及评价单元土壤肥力总分值 ;最后 ,利用聚类分析法将样区土壤肥力划分为五级 ,并借助 GIS软件 Map GIS绘制样区的土壤肥力综合评价图。江汉平原后湖地区土壤肥力主要为一、二级 ,一、二、三、四、五级肥力土壤分别占 2 4 .2 5 % ,5 2 .3 4 % ,11.2 0 % ,6.15 % ,6.0 6%。更多还原

【Abstract】 An evaluation method of soil integrated fertility was developed and us ed in the Houhu farm enterprise, with soil fertility being considered as a comp lex of the state of soil nutrients and the capacity to regulate and transform th e materials needed by plants. With systematic principle and the soil data of the Houhu farm enterprise, 9 indexes were divided into two groups representing sep arately states of soil nutrients and environments of nutrients supplying, includ ing content of total N, total P 2O 5, total K 2O, available P 2O 5, availab le K 2O, pH, physical clay, silt-clay ratio and thickness of soil surface lay er ( epipedon). Then two types of membership functions of these indexes, S-type and parabola-type, were developed based on their effects on plants. Their valu es of function were also calculated. Through factor analysis of these values wit h the Analytical Hierarchy Process (AHP), weight values of these indexes were decided. Finally, with Analytical Clustering Process (ACP), soils fertility was divided into 5 classes in this area. With GIS software MAPGIS, the map of soil c omprehen sive fertility in the Houhu farm enterprise area was drawn. The soil f ertility in this region was mainly in 1,2 classes, and area of soils in 1,2,3,4 ,5 classes amounts 24.25%,52.34%,11.20%,6.15% and 6.06% respectively.更多还原