香石竹设施栽培土壤可溶性盐分主成分分析

为探索香石竹设施栽培土壤盐害的防治方法与技术途径,对香石竹设施栽培土壤可溶性盐分进行了主成分分析。结果表明:土壤中可溶性盐分可分为主成分1(SO42-、NO3-、Ca2+、Cl-、K+)和主成分2(CO32-、HCO3-)两个成分,主成分1中SO42-、NO3-、Ca2+与土壤EC值三次模型拟合度较高(R2>0.850**),并与土壤EC值呈不同强度的正相关性;土壤EC值与全盐量呈强正相关性(r=0.99**),并接近线性关系(线性模型R2=0.976**,三次模型R2=0.984**);土壤EC值可作为一个有效指标,反映土壤盐渍化及土壤可溶性盐分,特别是反映SO42-、NO3-、Ca2+的变动情况,盐害防治重点在于SO42-、NO3-、Ca2+。研究对指导香石竹设施栽培土壤管理与持续利用具有重要意义。

Principal Component Analysis of Soil Soluble Salt Contents of Carnation (Dianthus caryophyllus L.) Facilities Cultivation

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.