紫花苜蓿人工草地土壤肥力的灰色关联度分析

摘要

The soil fertility of alfalfa artificial grassland in seven different ages were comprehensively analyzed using grey correlative degree analysis to evaluate the effect of stand age on soil fertility.The contents of organic carbon,total nitrogen,ammonium,nitrate,total phosphorus,available phosphorus,soluble calcium,soluble magnesium,urease and alkaline phosphates were tested, the soil comprehensive evaluation model of alfalfa artificial grassland was established, and the soil fertility was evaluated.The results showed that the soil fertility of nine years old alfalfa grassland was the best, which was the optimal using years for artificial grassland in agro-pastoral transitional zone.%应用灰色系统理论,选择0、1、2、3、6、10、13年等不同年限苜蓿人工草地为研究对象,通过对土壤的有机质、有机碳、pH、全氮、有效氮、有效钾、全磷、水溶性钙、水溶性镁、磷酸酶活性和脲酶活性等11项指标进行分析,建立了紫花苜蓿人工草地土壤综合评估模型,并对其土壤肥力进行了综合评估,结果表明:9年龄紫花苜蓿草地在综合评估模型中得分最高,土壤肥力最好,该种植年限是农牧交错区人工草地的最佳利用年限.