作　　者： ; ;

机构地区： 昌吉学院

出　　处： 《土壤通报》 2010年第6期1322-1327,共6页

摘　　要： 研究结果表明,在强酸性降雨径流(pH<2)冲刷下,城市土壤磷酸盐的解吸量明显增加;当pH>2时,降雨径流酸性强度大小对城市土壤磷酸盐的解吸量影响不大。城市土壤对磷酸盐的等温吸附曲线符合修正的Langmuir方程。在自然条件下,即使在酸雨(pH<4.5)的条件下,酸碱度效应对城市土壤磷酸盐吸附量的影响较小;随固液比增大,城市土壤磷酸盐以解吸为主的趋势越明显。这说明城市土壤吸持外源磷的能力弱,土壤胶体所吸附的磷容易被解吸进入土壤溶液,从而随着土壤溶液流动进入城市水环境,导致水体中磷浓度增高。 This study used information from the Langmuir-isotherm equation to describe the chemical mechanism of phosphorus（P）-sorption reactions in urban soil.A series of laboratory experiments were carried out to quantify physical and chemical factors that control the level of soluble P in urban soil.Variations of pH had little influence on the adsorption and desorption process of P.For the water-to-soil ratio,high water-to-soil ratio could lead to the decrease of desorption concentration,which meeting the power isotherms.The phosphate desorption-absorption kinetic characteristics could reflect the situation of urban water systems.

关 键 词： 城市土壤 磷酸盐 解吸 吸附

领　　域： [环境科学与工程]