In order to provide theoretical support for enhancement and improvement of soil qualities of Youcha(Camellia)forests,soil pH and contents of organic matter,total nitrogen,total phosphorus,total potassium,hy-drolyzable nitrogen,available phosphorus,available potassium,substitutional calcium,substitutional magne-sium,available copper,available zinc,available boron,available iron and available manganese were deter-mined.Principal component analysis(PCA)and cluster analysis(CA)were used to establish minimum data sets.Soil quality of Youcha forests was evaluated based on soil quality index(SQI).Results showed that nutri-ents in Youcha forests belonged to medium levels.Soil pH value was 4.77,with obvious acidification.Evalua-tion indexes in minimum data set established by PCA included contents of total nitrogen,available phosphorus,substitutional magnesium,available copper and available manganese.SQI of Youcha forests calculated by mini-mum data set established by PCA ranged from 0.249 to 0.684,with mean of 0.459.Soil quality level mainly dis-tributed fromⅡtoⅤ,without levelⅠ.Minimum data set established by PCA could extract most of data infor-mation compared with CA and could effectively evaluate soil quality of Youcha forests.
关键词
主成分分析/聚类分析/最小数据集/土壤质量指数/油茶林
Key words
principal component analysis/cluster analysis/minimum data set/soil quality index/Youcha(Ca-mellia)forest
维普
万方数据