攀枝花市成龄芒果园土壤肥力评价

为明确攀枝花市成龄芒果园土壤养分状况,科学指导施肥,本研究对43个芒果园土壤（0~40 cm）进行采样,测定分析了土壤pH、有机质、速效养分和微量养分的含量。结果表明：研究区内13种肥力指标变异系数在0.13~0.75之间,均属于中等变异强度。经取样数合理性统计分析,评价芒果园土壤肥力的43个样本数能够满足90%置信水平下20%相对误差的精度需求。采用主成分分析法和隶属度函数法结合雷达图评价单因素肥力指标在土壤中的状况,结果表明,pH、碱解氮、速效磷、有效铁和有效锌是影响土壤肥力水平的限制性因子。研究区土壤肥力综合指数（IFI）范围为0.25~0.93,平均值为0.55,果园之间IFI的差异较大。

Assessment of Soil Fertility in the Mango Orchards of Panzhihua,Sichuan, China

The soil fertility of the mango orchard in Panzhihua,Sichuan,China was evaluated to provide a scientific basis for the management of the fruit in the area.The soil samples in the depth 0-40 cm in 43 mango orchards were collected to determine the soil pH,contents of organic soil matter,available nutrients and micronutrients and analyze the data of the soil nutrients.The results showed that the variable coefficient of 13 nutrient contents was 0.13-0.75 in the region,and the variation was moderate.Statistical analysis revealed the soil fertility in the 43 orchards was sufficient to meet the required accuracy of 20%relative error under 90%confidence level.Principal component analysis,membership function and the radar plot were used to assess the single factor fertility.It showed that pH,available nitrogen,available phosphorus,available Fe and available Zn were the limiting factors for the soil fertility quality in the study area.The soil integrated fertility index in the study area was 0.25-0.93 with an average value of 0.55.But the difference of IFI among the orchards was significant.