上海临港重装备区土壤盐分特征分析

Analysis of the Soil Salinity in Shanghai Lingang Heavy-Facility Area

为了解上海临港重装备区土壤的背景值,为土地合理利用提供科学依据,通过室外调查与室内测定相结合的方法,分析了不同空间分布和垂直分布下的临港重装备区的盐分分布特征。结果表明:该区土壤78.63%为非盐化土壤,10.26%为轻度盐化土壤,3.42%为中度盐化土壤,4.27%为重度盐化土壤,3.42%为盐土;越靠近东海,土壤盐分含量越高,其中阴离子以Cl-和HCO3-为主,阳离子以Na+为主;土壤中主要阴阳离子的剖面分布规律相似,即表层含量较高,随土层深度增加而降低,但CO32-和HCO3-的分布规律则相反。近海阴离子以Cl-为主,离海越远土壤为苏打性盐渍化,即表层土壤阴离子主要以HCO3-离子为主,底层土壤阴离子以Cl-和SO42-为主。除盐分外,pH碱性强和有机质含量低是临港重装备区环境的主要制约因子。

In order to understand the soil background of Lingang heavy-facility area of Shanghai and provide a scientific basis for the rational utilization of land, through the method of outdoor and indoor investigation to analysis the soil salinity of the spatial and vertical distribution of Lingang heavy-facility area. The results indicates that 78.63%,10.26%,3.42%,4.27% and 3.42% soil is non, slightly, moderately, strongly and salinized respectively. The salinity content of the soil is in a reverse proportion to the distance from the East Sea. Among the component of salt salinity, anions are dominately CI^- and HCO3^-, while cations are mainly Na^＋. In the soil section plane distribution, the main cation and anion ions have the similar rule, the content of them in the surface layer are high. The content is increasing with depth of soil layer except for CO3^2- and HCO3^- ion. Near the sea, the main anion is CI^-. while far to the sea, it is soda salinity. The soil anion in the smfaee layer is primarily HCO3^-, the anion in the bottom is mainly CI^- and SO4^2-. Except for salininaion, high pH value and low content of organic matter are the main restricting factors in Linggang heavy-facility area.