海南胶园土壤磷吸附特性及其影响因素

研究海南农垦7个胶同土壤磷吸附特性及其影响因素,结果表明:①Langmuir、Freundlich和TemDkin方程都能很好与等温吸附曲线拟合,其中Langmuir方程拟合效果最好并与研究结果最相符;②不同母质发育的土壤磷吸附能力依据土壤磷的最大吸附量X_m排序为:玄武岩>砂贞岩>变质岩>花岗岩>浅海沉积物;③土壤CEC_(7.0)粘粒含量、有机质含量、游离铁含量等因素显著影响土壤磷的吸附能力.其中土壤有机质含量与土壤磷最大吸附量X_m呈显著负相关,同时,土壤粘粒含量越高,供试土壤磷的吸附能力越强.

Characteristics of Phosphorus Sorption and Their Impact Factors in the Soil of Hainan Rubber Plantations

The soils from 7 rubber plantations were sampled and added with phosphorus to determine phosphorus sorption of the soils. The results showed that Langmuir, Freundlich and Tempkin equations could fit well with the curves of phosphorus sorption isotherms, of which Langmuir equation had the best fitting and accorded with the research result. Phosphorus sorption capacity of the soil derived from different parent materials depended on maximum soil phosphorus sorption and was in the order of basalt >sandy shale>metamorphic rock>granite>neritic deposits. The value of CEC7.0 and the contents of clay, organic matters and free iron showed significant correlation with the P sorption capacity, and the organic matters had the significantly negative correlation with the maximum P sorption capacity. In the meantime, the higher the content of clay of the soils, the higher the P sorption capacity of the soils.