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对湖南省永顺县烟区的239个土壤样品、19项土壤养分指标进行了测定,确定了各指标所属的隶属度函数类型及其阈值,采用主成分分析法求得各指标的权重,用加乘法算出各土样的土壤肥力综合指标值(IFI),进而对永顺县植烟土壤适宜性进行了综合评价。结果表明:永顺县烟区土壤肥力存在较大的差异,其IFI值平均为0.541,变幅为0.341～0.730,变异系数5.14%。采用聚类分析法将土壤肥力分为高、较高、中等、较低4类,各类土样所占比例依次为15.86%、21.61%、44.17%、18.36%。
The soil nutrients of 239 soil samples in Yongshun County of Hunan Province were measured and 19 soil nutrient indexes were determined. The membership function types and thresholds of each index were determined. The weight of each index was calculated by principal component analysis The multiplication method was used to calculate the soil fertility comprehensive index (IFI) of each soil sample, then the soil suitability of tobacco planting in Yongshun County was comprehensively evaluated. The results showed that there was a big difference in soil fertility in Yongshun County tobacco area. The average IFI value was 0.541, the amplitude ranged from 0.341 to 0.730, and the coefficient of variation was 5.14%. The soil fertility was divided into four categories (high, medium, and low) by cluster analysis. The proportions of various soil samples were 15.86%, 21.61%, 44.17% and 18.36%, respectively.