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测定了4种发育于不同母质上的红壤对磷的吸附等温线,探讨了红壤与磷酸盐反应的特征及其主要影响因素。红壤对磷酸盐县有很高的吸附能力,这主要是由于红壤中含有大量游离的铁、铝氧化物的缘故。改变红壤的pH即引起红壤对磷的吸附量的变化,这种现象可以用红壤中交换性铝量的变化加以解释。红壤对磷酸盐的吸附等温线可以用简单的Langmuir等温式进行很好的描述。
The adsorption isotherms of phosphorus on three red soils developed on different parent materials were determined. The characteristics of the reaction between red soils and phosphates and their main influencing factors were discussed. Red soil has a high adsorption capacity for phosphate rock because of the large amount of free iron and aluminum oxide in the red soil. Changing the pH of the red soil causes changes in the amount of phosphorus adsorbed by the red soil, a phenomenon that can be explained by the amount of exchangeable aluminum in the red soil. Phosphate sorption isotherms in red soils can be well described by simple Langmuir isotherms.