基于灰色关联投影的土壤养分分区管理模型研究

针对目前我国氮、磷、钾肥施用比例失调,中、微量元素缺乏的现状,以及不同作物对土壤养分的不同需求这一事实,建立了基于层次分析(AHP)与变异系数(CV)的灰色关联投影模型。该模型通过层次分析法得到各指标的主观权重,通过变异系数法得到各指标的客观权重,然后计算各样本点的灰色关联投影值,最后根据分区标准对样本区的土壤养分进行划分。从分区结果可以看出该模型能够根据作物类型进行全面、合理的土壤养分分区,且各分区的土壤养分层次分明。

Research on Subarea Management Model of Soil Nutrients Based on Grey Relation Projection

Considering the status that the unbalanced ratio of nitrogen fertilizer, phosphorus fertilizer, potassium fertilizer, and the lack of medium elements and trace elements ,and the fact that different crops have different needs on soil nutrients ,the grey relation projection model based on the analytic hierarchy process （AI-IP）and the coefficient of variation （CV）was built. The subjective weights of every index were obtained by AHP, and the objective weights were obtained by CV. The grey relation projection values of every sample point were calculated. At last, partitioning of the sample area according to the partition standard was conducted. From the results, it could be known that this model could partition the sample area reasonably, and overall according to the crops, and the soil nutrients of each subarea showed different levels.