施用磷石膏对碱化土壤氟含量及其吸附特性的影响

通过室内培养试验和田间试验就施用磷石膏对土壤氟含量和土壤对氟吸附特性的影响进行了研究．结果表明，经连续４年施用磷石膏改良土壤后，０—２０ｃｍ土层全氟积累现象明显．但是，土壤水溶性氟含量却随磷石膏施用量增加而降低．土壤对氟的吸附数据均能与Ｌａｎｇｍｕｉｒ，Ｆｒｅｕｎｄｉｌｉｃｈ和Ｔｅｍｋｉｎ方程很好地拟合，施用磷石膏处理土壤对氟的最大吸附量高于没有施用磷石膏处理的．影响土壤水溶性氟含量和吸附特性的主要因素可能是土壤钙含量的增加和ｐＨ值的降低．

Effect of application phosphogysum on contents and adsorption characteristic of fluorine in alkline soils

The changes of contents and adsorption characteristics of fluorine in a alkaline soils improved by applying phosphogpsum for 4 years successively were studied.The results indicated that the total fluorine accumulated evidence was obviously among the soils (0-20cm) applied phosphogpsum. But, There was a tendency that the contents of water soluble F-dropped with the increase amount of phosphogpsum added. The trial data of F-adsorption in examined soils were significantly conform to Langmuir,Freundlich,Temkin equations The maximum amounts of F-adsorbed were increased in the improved soils compared with the soil (CK). The main factors controlling the contents of water soluble F-and F-adsorption behavior might be the amount of Ca²⁺ and pH values in the soils.