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对广东省 5种不同母质上发育的水稻土进行了P素等温吸附试验 .结果表明 ,供试土壤的等温吸附数据与Langmuir、Freundlich和Temkin 3个方程都能很好地拟合 ,但以Langmuir方程拟合程度最好 (相关系数从0 .995 到 0 .999 ) .利用Langmuir方程计算的P最大吸附量 (Xm )和吸附强度因子 (K)的乘积 (KXm :P吸附特性值 )可以作为水稻土吸附P素的综合指标 ,KXm的大小可以表明水稻土施P次序 .试验结果还表明供试水稻土对P素吸附存在两种不同的吸附区 .
P isothermal adsorption experiments were conducted on paddy soils developed on five different parent materials in Guangdong province.The results showed that the isothermal adsorption data of the tested soils fit well with the three equations of Langmuir, Freundlich and Temkin, but Langmuir The equation fits best (correlation coefficient from 0 .995 to 0 .999). The product of the maximum adsorption capacity (Xm) and the adsorption strength factor (K) calculated using the Langmuir equation (KXm: P adsorption property) The comprehensive index of P uptake by paddy soil and the size of KXm can indicate the P order of paddy soil.The results also show that there are two different adsorption zones for P sorption in paddy soil.