<正>通过对福建杉木林下红壤的磷素吸附与解吸特性研究，结果表明：杉木林下红壤的磷素吸附容量大，吸磷能力强，且吸附的磷素较难解吸。土壤磷素最大吸附量和吸附能与ｐＨ、吸湿水及粘粒含量呈正相关，与有机质、有效磷、全磷含量呈负相关。根据Ｌａｎｇｍｕｉｒ方程求出的土壤磷素吸附容量（Ｘｍ），可作为合理施用磷肥的参考。

This paper is about the research on the properties of phosphorus adsorption and desorption in red soils under the stand of Chinese fir （Cunninghamia lanceolata). The main results showed that the red soil could adsorb large amount of phosphorus. Phosphorus in solution could be adsorbed quickly and firmly by the soil, while phosphorus adsorbed was difficult to desorb from the soil. Regression analysis revealed that phosphorus adsorption maxima and combining energy had a positive relation to the pH value and the amount of clay particle of the soil. But they had a negative relation to the contents of organic matter, available phosphate and total phosphate of the soil. Results also showed that the phosphorus adsorption maximum calculated from Langmuir equation could be considered as a reference for rational application of phosphatic fertilizer.