Principal Component Analysis of Soil Soluble Salt Contents of Carnation (Dianthus caryophyllus L.) Facilities Cultivation
香石竹设施栽培土壤可溶性盐分主成分分析

In order to understand soil salt damage prevention and control technique for carnation (Dianthus caryophyllus L.) facilities cultivation, principal component analysis (PCA) of soil soluble salt contents was taken. The results showed that soil soluble salts could be divided into principal component 1 (SO42-, NO3-, Ca2+, Cl-, K+) and principal component 2 (CO32-, HCO3-). SO42-, NO3- and Ca2+ in principal component 1 showed higher degree of cubic model plot fit (R2 =0.850 **), and showed different degrees of positive correlation with soil EC value. Soil EC value was significantly positively correlated (r = 0.99 **) with soil total salt content and was near linear relationship (linear model R2 = 0.976 **, R2 of cubic model = 0.984 **). Soil EC values could be used as an effective indicator to indicate soil salinization and the changes of soil soluble salts, especially SO42-, NO3- and Ca2+, thus salt damage prevention and treatment should focus on SO42-, NO3- and Ca2+. This study is of important in guiding the management and sustainable use of carnation facilities cultivation soil.