测土配方施肥项目中县级土壤基本肥力评价研究

目的]为县级土壤肥力评价及其空间变异研究提供技术方案。方法]以安徽宣城市宣州区为例,在地理信息系统(GIS)支持下,采用模糊数学方法建立肥力评价模型,运用因子分析法确定模糊评分方程,进行县级土壤基本肥力的综合评价。结果]宣州区土壤基本肥力综合指数为0.4~0.8,其肥力可分为7级。各肥力等级间差异明显,沿圩区、沿湖阶地、沿河流域、丘陵山区、山区土壤肥力水平依次降低。肥力最好的土壤主要分布在水阳镇,面积约6 700 hm2。结论]利用该方法进行县级土壤肥力评价是可行的。

Study on Basic Soil Fertility Evaluation in County Level in Project of Formula Fertilization by Soil Testing

Objective] The aim of the research was to provide technical scheme for evaluating the soil fertility at county level and studying its spatial variation.Method] Taking Xuanzhou district of Xuancheng city in Anhui province as an example,with the support of geographic information system(GIS),fuzzy mathematics method was used to set up soil fertility evaluation model.The fuzzy scoring equation was confirmed by factor analysis method to make the comprehensive evaluation on the basic soil fertility at county level.Result] The comprehensive index of basic fertility of soil in Xuanzhou District was 0.4～0.8 and its fertility could be divided into 7 levels.The differences among different fertility level was obvious and the soil fertility level of polder-along region,lake-along terrace,river-along basin,hilly and mountainous areas qand mountainous area was decreased in turn.Soil with the best fertility was mainly distributed in Shuiyang township with the area of 6 700 hm2.Conclusion] It was feasible to evaluate the fertility of county soil by using this method.