廊坊市郊设施蔬菜土壤次生盐渍化状况分析

目的]了解廊坊市郊设施蔬菜土壤盐渍化状况。方法]按蛇行路线采取廊坊市郊大棚温室、露天菜地和林地土壤,对其土壤肥力、盐分积累及盐分离子组成进行分析,并对如何防治设施蔬菜土壤次生盐渍化进行探讨。结果]廊坊市郊大棚温室土壤肥力水平属中等略偏高,但存在高氮、高磷、低钾现象。大棚温室土壤各养分含量均比露天菜地和林地土壤高。大棚温室土壤中的盐离子含量明显高于露天菜地和林地土壤,其含盐量已达盐渍化土标准。大棚温室土壤盐分以K+、Na+、Mg2+、Ca2+、HCO3-、Cl-、SO42-为主,其中Na+、SO42-积累量远高于其他离子。结论]施肥不当及人为调控下的耕作管理措施是导致设施蔬菜土壤次生盐渍化的重要原因。

Analysis of Soil Secondary Salinization of Protected Vegetable in Langfang Suburb

Objective] The aim was to know about soil salinization state of protected vegetable in suburb of Langfang City.Method] The soil samples in plastic greenhouse,open vegetable fields and woodland in Langfang City were taken according to hunting route,and the soil fertility,salt accumulation and salt ion composition were analyzed,and how to prevent and cure soil secondary salinization of protected vegetable was discussed.Result] The soil fertility of plastic greenhouse in Langfang suburb was at slightly over medium level,but had high nitrogen,high phosphorus and low potassium phenomena.Each nutrient content in plastic greenhouse soil was all higher than that of open vegetable fields and woodland soil.The salt ion content in plastic greenhouse soil was significantly higher than that in open vegetable fields and woodland ones,with salt content up to the salinification soil standard.The salt constitution of plastic greenhouse soil was mainly K+,Na+,Mg2+,Ca2+,HCO-3,Cl-and SO42-,among which,accumulation volume of Na+ and SO42-was much higher than that of other ions.Conclusion] The improper fertilization and cultivation management measures under artificial adjustment were important reasons that resulted in soil secondary salinization.