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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。
The GPS technology was used to carry out fixed-point sampling in Anyang County. The contents of total nitrogen, available nitrogen, organic matter, available phosphorus and available potassium in soil samples were determined. Select the membership function to initialize the index, choose the correlation coefficient method to calculate the evaluation index weight, and use the improved gray relational model to make a comprehensive evaluation of the farmland soil fertility in Anyang County, and draw the soil fertility level distribution map. The results showed that the soil fertility in Anyang County had obvious regional differentiation in the distribution, showing a decreasing trend from the eastern region to the western region. The results of comprehensive evaluation of soil fertility are consistent with the results of field survey and analysis. The feasibility and scientific evaluation of soil fertility by improved gray relational analysis method are demonstrated.