海南油茶林土壤磷吸附特性

Soil Phosphorus Adsorption Characteristics of Oil Camellia Forest in Hainan

选择了海南地区9个代表性油茶林，采用等温吸附试验研究土壤磷吸附特性。结果表明．海南油茶林的土壤磷等温吸附曲线符合Langmuir单表面方程．磷最大吸附量为264～1007mg／kg，吸附平衡常数为0．11～3．79；海南油茶林土壤磷最大吸附量与有机质含量、全磷含量呈显著正相关关系，与有效磷含量呈显著负相关关系，表明有机质和全磷含量越高的土壤，对磷的吸附固定能力越强；对磷的吸附固定能力越强的土壤，其土壤有效磷含量越低。

The soil phosphorus（P） adsorption characteristics of nine typical oil camellia forests in Hainan province were studied by testing the adsorption isotherms. Results showed that Langmuir single surface equation could fit well with the curves of P adsorption isotherms. The maximum soil P adsorption ranged form 264 mg/kg to 1 007 mg/kg, and the adsorption equilibrium constant ranged from 0.11 to 3.79. There was significant positive correlation between the maximum soil P adsorption and the content of soil organic materials and total P. Moreover the content of soil available P was significantly negatively correlated with the maximum soil P adsorption. This indicated that higher content of soil organic matter and total P would lead to stronger P adsorption and fixation, and further lower the soil available P content.