摘要： 对滨海脱盐土壤上11年生I-69杨根际、非根际土壤磷吸附特性进行了研究。结果表明，I-69杨根系活动能抑制根际土壤对磷的吸附，抑制能力与培养溶液起始磷浓度相关，当培养溶液起始磷浓度为30mg/L时，抑制能力最大，根际、非根际土壤磷吸附量之差为-15.57mg/kg；I-69杨根际、非根际土壤磷恒温吸附数据都能很好地用一元Langmuir方程、Freundich方程和Temkin方程拟合，其中一元Langmuir方程拟合最好；根际土壤磷吸附容量参数Xm，k，k₁，k₂的值明显低于非根际土壤，相关分析表明，它们与土壤有效磷含量呈显著负相关。

关键词: 杨树, 根际土壤, 磷吸附

Abstract: It was investigated that characteristics of phosphorus adsorption in rhizosphere and non-rhizosphere soils of poplar.Results showed that phosphorus adsorption amounts in rhizosphere soil were lower than those in non-rhizosphere soil within phosphate contents tested,and when phosphate content tested was 30mg/L,the difference of phosphorus adsorption amount was the greatest between rhizosphere and non-rhizosphere soils and reaches-15.57mg/kg.Phosphorus adsorption data of rhizosphere and non-rhizosphere soils fit well with one-surface Langmuir,Freudlich and Temkin equations at a very significant level of 0.01,but one-surface Langmuir equation was the best.Phosphorus adsorption parameters of rhizosphere soil in three equations-Xm,k,k₁ and k₂ were clearly smaller than those of non-rhizosphere soils.Simple correlation analyses showed that Xm,k,k₁,and k₂ were negatively correlated with contents of available-P at a very significant level of 0.01.

Key words: Poplar, Rhizosphere soil, Phosphorus adsorption

中图分类号: 

• S153.6+1