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运用主成分分析和聚类分析方法对重庆市黄壤养分特性进行了分析。结果表明:重庆市山地黄壤的90个样品的19个指标主成分分析得出6种主要因子,其贡献率分别是22.68%、19.55%、13.95%、11.36%、9.20%和7.96%,累计贡献率达到84.34%,运用系统聚类的方法将重庆市黄壤划分为3种养分类型:类I为低N低有机质土壤;类II为高肥力土壤类型;类Ⅲ为中等肥力土壤类型。其中,I类是重庆黄壤的主要土壤养分类型,所划分的养分类型能反映所研究区县黄壤的养分特征。
Principal component analysis and cluster analysis were used to analyze the nutrient characteristics of yellow soil in Chongqing. The results showed that there were 6 main factors in 19 samples of 90 samples of mountain yellow soil in Chongqing, and their contribution rates were 22.68%, 19.55%, 13.95%, 11.36%, 9.20% and 7.96% respectively. The cumulative contribution Rate of 84.34%. The methods of systematic clustering were used to classify the yellow soil of Chongqing as three types of nutrients: class I is low and low organic matter soil; class II is high fertility soil type; and class III is medium fertility soil type. Among them, type I is the main type of soil nutrients in yellow soil in Chongqing, and the types of nutrients classified can reflect the nutrient characteristics of the yellow soil in the studied area.