县域农田土壤速效养分肥力综合评价

Integrated Assessment of Soil Fertility in Available Nutrients in County Region

以湖北省洪湖市为例,2006年春秋两季在县域尺度进行了0～20 cm耕层土壤布点采样和主要土壤理化性质测试分析的基础上,采用土壤图和行政区划图的叠置,所产生的最小多边形作为评价单元,以土壤有机质、碱解氮、有效磷、速效钾、pH值为速效养分肥力评价指标因子,根据S型或抛物线型作物施肥效应曲线建立各项肥力指标的隶属度函数,计算出隶属度值,并采用层次分析法确定各指标因子的权重系数,运用因子加权综合指数法计算反映土壤肥力状况的综合评价指标值,以ArcGIS地统计分析模块和空间分析模块为软件平台生成洪湖市土壤速效养分肥力综合评价等级图。

An integrated assessment of soil fertility was developed in Honghu County of Hubei province based on soil sampling（0～20 cm） and the soil properties（available N,organic matter,available P,available K,pH） were tested in 2006.The smallest polygon were taked the appraisal unit by the intersect of soil map and administrative map on ArcGIS platform.5 indexes were divided into two groups representing separately states of soil nutrients and environment of nutrients supplying,including content of organic matter,available N,available P,available K,pH,Then two types of membership functions of these indexes,s-type and parabola-type,were developed based on their effects on plants.Their values of function were also calculated.Through factor analysis of these indexes with the Analytical Hierarchy Process（AHP）,weight coefficients of these indexes were decided.Finally,the Integrated Fertility Indexes（IFI） was calculated and hierarchy diagram of soil integrated fertility was created supported by Spatial Analysis on ArcMap platform.