中文摘要：

采用平衡吸附法研究了太湖地区酸性土壤（黄泥土）团聚体对磷的吸附与解吸特征及p H值的影响。结果表明,团聚体对磷的吸附等温线用Freundlich模型模拟为最佳（r〉0.998 3）。磷吸附量大小顺序为黏粒级〉砂粒级〉原土〉粉砂级〉粗粉砂级,与其中有机质、不定形铁和铝氧化物的含量大小顺序一致,磷的解吸率与此顺序相反。在p H 3.2-7.7内,随p H值的升高,磷吸附量逐渐下降,磷解吸率逐渐增加。而在p H 7.7-8.4内,随p H值的升高,磷吸附量增加,磷解吸率下降。土壤中黏粒级和砂粒级保磷能力较强,粉砂级和粗粉砂级供磷能力较强。适当增加土壤p H值可以有效提高土壤的供磷能力。

英文摘要：

The characteristic phosphorus adsorption-desorption of yellow upland soil aggregates from the Tai Lake region with the pH effect was studied using an isothermal equilibrium adsorption method. The results showed that the adsorption curves of phosphate due to the aggregates could be fitted by the Freundlich isotherm （r 〉 0.9983）. The phosphate adsorption capacity followed the trend from the highest-level to the lowest： clay, coarse, bulk soil, silt, fine, which was consistent with the content of organic matter, amorphous iron and aluminum oxide. The phosphate adsorption capacity displayed the reverse pattern of phosphate desorption. In the range of pH 3.2 - 7.7, the adsorption amounts of phosphate decreased but the desorption rate increased with the pH increasing. However, in the range of pH 7.7 - 8.4, the adsorption a- mounts of phosphate increased but the desorption rate decreased with the pH increasing. Among the four fractions, the clay and sand had stronger phosphate preserving, while the silt and coarse silt had stronger phosphate supplying. Increasing the soil pH value appropriately, could effectively enhance the capacity of soil phosphate supplying.