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本文采用主成分分析和等间距聚类分析方法对四川省会东县植烟土壤养分进行了综合评价。结果表明:①会东县植烟土壤pH值、有机质和全氮适中;碱解氮、全磷、速效钾和全钾含量丰富;有效磷含量较高,但分布不均。有效硼含量缺乏,有效锌、有效铁、有效铜、有效锰含量丰富。②土壤肥力综合得分IFI值的变幅为0.25~0.75,平均值为0.53,根据IFI值大小将全区土壤肥力分为4个等级,其中土壤养分处于中等、较高和高水平占全区所有土壤样品比例的78.13%。③不同乡镇IFI值以岔河乡、姜州乡、松坪乡和淌塘乡较高,处于较高和高水平的样点比例大于70%;柏岩乡、大崇乡、会东镇和中心乡的IFI值较低,处于土壤综合肥力低水平;其余各乡镇综合肥力居中。④不同海拔高度土壤的综合肥力指标值大小为:高海拔>中海拔>低海拔。
In this paper, principal component analysis and the method of equidistant cluster analysis were used to evaluate the soil nutrients of tobacco planting in Huidong County, Sichuan Province. The results showed that: ①The pH, organic matter and total nitrogen of tobacco planting soil in Huidong County were moderate; the content of available nitrogen, total phosphorus, available potassium and total potassium were rich; the content of available phosphorus was high but the distribution was not uniform. The lack of effective boron content, available zinc, available iron, available copper, rich in available manganese. (2) IFI value of soil fertility integrated score varied from 0.25 to 0.75 with an average value of 0.53. According to the IFI value, the soil fertility of the whole area was divided into four grades, of which the soil nutrient was medium, the higher and the highest were all 78.13% of the soil samples. ③ The IFI values of different towns are higher than 70% in Chahe Township, Jiangzhou Township, Songping Township and Tongtang Township; the proportion of sampling points at higher and higher levels is higher than 70%; Panyan Township, Dacong Township, Huidong Town and IFI value of the center township is low, which is at a low level of comprehensive soil fertility; the rest of townships have a comprehensive fertility center. ④ The indexes of soil fertility index at different altitudes are: high altitude> middle altitude> low altitude.