基于改进灰色关联模型的土壤肥力综合评价

Comprehensive Evaluation of Soil Fertility Based on Improved Grey Relation Model

采用GPS技术,在安阳县进行定点采样,测定耕地各样点土样的全氮、碱解氮、有机质、速效磷和速效钾含量。选择隶属函数进行指标初值化,选择相关系数法计算评价指标权重、采用改进灰色关联模型对安阳县农田土壤肥力进行综合评价,并绘制土壤肥力等级分布图。结果表明,安阳县土壤肥力在分布上具有明显的地域分异特点,总体呈自东部区域向西部区域递减的趋势。土壤肥力综合评价结果与实地调查分析结果相符。表明了改进灰色关联模型分析方法对土壤肥力评价的可行性和科学性。

By adopting GPS technique, 381 sampling sites were installed in the Anyang city, Henan province,with 0-20 cm soil samples collected to determine their main nutrients contents. Soil characteristics were firstly initialized using membership function,and then the weight of soil index was calculated using correlation coefficient method. Soil fertility suitability was evaluated using gray relation grade analysis, and the grade map of soil fertility was finally established. The result showed that soil fertility distribution had obviously regional characteristics, and the integrated fertility index descended from east area to west area. The results were consistent with local condi- tions according to field survey. The approach was feasible and effective in soil fertility evaluation.