濒危植物翅果油树根际土壤磷的有效性研究

本文采用酸溶－钼锑抗比色法、张守敬－Jackson分级测定法、灼烧－0.2N H2SO4浸提法、0.03N NH4F-0.025N HCl浸提－钼锑抗比色法、以及电位法对翅果油树（DElaeagnus.mol-lis）根际土与非根际土的全磷、无机磷、有机磷、有效磷及土壤pH值等进行测定与分析。结果表明，在翅果油树土壤中全磷浓度在根与非根际相近，有效磷和无机磷在根际略高于非根际，有机磷在根际略低于非根际，但均无明显差异，比较无机磷各组分与土壤有效磷的相关性发现：无论在根际还是在非根际，其相关系数均未达到显著水平，除Fe-P外，其余各组分都表现出根际略大于根际的趋势，翅果油树土壤pH表现为根际略小于非根际，而且均呈弱碱性，这与其土壤Ca-P含量高相一致。

The Research of Soil P Availability in Elaeagnus.mollis Rhizosphere

In this paper, Total P, Inorganic P, Organic P, Available P and Soil pH in rhizosphere and non-rhizosphere soil of Elaeagnus.mollis were calculated and analyzed by soil P analysis methods. The results show that in Elaeagnus.mollis soil the Total P concentration in rhizosphere was similar to non-rhizosphere. Available P and Inorganic P concentration in rhizosphere were a bit higher than that in non-rhizosphere. Organic P concentration in rhizosphere were a bit lower than that in non-rhizosphere. But there was no significant difference. The correlation between each ingredient of Inorganic P and available P was compared, and found that the relative coefficients of both rhizosphere and non-rhizosphere did not get a significant level. Except Fe-P, the other ingredient concentrations in rhizosphere were little higher than that in non-rhizosphere. The pH in the soil of Elaeaqnus.mollis was smaller in rhizosphere than that in non-rhizosphere, and both of them were somewhat alkali. That is indentical with the high content of Ca-P.