云南保山西庄河流域森林土壤磷吸附特性

本实验测定了云南省保山地区西庄河流域几种森林土壤对磷的等温吸附。实验结果表明，供试土壤对磷的吸附很的拟合了Langmuir等温吸附曲线。土壤母质对磷的吸附影响很大，磷吸附量依次是页岩＞石灰岩＞砂岩。土壤中铁、铝含量是影响磷吸附量遥最重要和最直接的因素，其它土壤特性也通过影响铁、铝的含量或者铁铝氧化物的活性而间接影响土壤的磷吸附量。相关分析表明，供试土壤磷饱和吸附量与活性Fe^3 、Al^3 、全氧、有机质含量分别呈正相关，其相关系数分别是0．6215、0．6853、0．6855和0．6819；而与土壤pH、Ca62 含量、交换性盐基离子含量和直离子饱和度呈负相关，其相关系分别是－0．7366、－0．6802、－0．6383和－0．8730，都达到了1％的显著水平。

A Primary Study on Phosphorus Adsorption of Forest Soils in Xizhang Watershed, Baoshan Yunnan

Soils sampled from the forests in Xizhuang Watershed,Baoshan,Yunnan Province were studied for phosphorus adsorption in this paper.The experiment results showed that P adsorption of the soils could be simulated well by Langmuir equation.Soil parent materials had a significant effect on P adsorption.The P adsorption of the soils derived from limestone was higher than the soils derived from sandstone,but lower than the soils derived from shale.Fe 3 and Al 3 in the soils were the most important factors which influenced the P adsorption capability,and the other soil characteristics influenced P adsorption by influencing the content or the activity of Fe 3 and Al 3 .Highly significant positive correlation was found between P adsorption capability and the content of Fe 3 ,Al 3 ,total nitrogen,organic matter in the soils,and the correlation coefficients were 0 6215,0 6853 and 0 6819,respectively;while negative correlation was found between P adsorption capability and the content of Ca 2 ,pH,exchangeable base,base saturation,and the correlation coefficients were -0 7366,-0 6802,0 6383 and -0 8730,respectively,all at a significance level of 1%.