非洲菊设施栽培土壤盐分的累积

Salt Accumulation in Greenhouse Soil of Gerbera jamesionii

对上海市奉贤区非洲菊栽培现状进行野外调查和取样分析,研究了设施栽培条件下土壤盐分的累积及离子组成变化特点。结果表明:设施栽培条件下,土壤出现酸化和次生盐渍化趋势,土壤的酸化主要和NO3-的累积有关;除HCO3-、K+外,Cl-、SO42-、NO3-、Na+、Mg2+、Ca2+均有不同程度的累积,且这6种离子间的相关性较好;土壤中盐分阴离子以NO3-为主,阳离子以Ca2+为主,对全盐量与各种离子进行逐步回归,得到模型为:ρ(全盐量)=0.291+5.295ρ(Ca2+)+2.177ρ(NO3-),且差异极显著。

Salt accumulation and ion constitution were studied by investigating greenhouse Gerbera jamesionii cultivation in Fengxian Area of Shanghai City,and analyzing both greenhouse and open field soil samples.The results showed that soil acidification and secondary salinization occurred.Soil acidification was mainly due to the accumulation of NO3^-.Apart from HCO3^-,K^＋,the contents of Cl^-,SO4^2-,NO3^-,Na^＋,Mg^2＋,Ca^2＋ increased to different degree in greenhouse soils and they were well correlated each other.NO3-and Ca^2＋ were the major ions in the soils.The significant stepwise regression equation between ions and soil salinity is ρ（soil salinity）=0.291＋5.295ρ（Ca^2＋）＋2.177ρ（NO3^-）.