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本文报道了黄土性土壤及作为对照的中性水稻土和酸性红壤对磷的吸附与解吸特性。实测吸附曲线与简单Langmuir等温吸附方程最为吻合,全部供试样本的相关系数均达到显著水平;而与Temkin方程和Freundlich方程只是部分吻合。与酸性红壤相比,黄土性土壤是一种弱吸磷能力的土壤,评价其吸磷能力的最适参数是根据简单Langmuir方程求出的最大吸磷量(q_m),支配q_m的土壤性质主要是游离氧的铁含量,其次是粘粒和CaCO_3的含量。黄土性土壤对吸附磷的解吸能力很强,其等温解吸曲线也是可以分成三个区域,代表各种不同能级的吸附磷被解吸的过程。
In this paper, the adsorption and desorption characteristics of phosphorus in loessial soil and control neutral paddy soil and acid red soil were reported. The measured sorption curves are in good agreement with the simple Langmuir isotherm equation, and the correlation coefficient of all tested samples reaches a significant level. However, it is only partially consistent with the Temkin equation and the Freundlich equation. Compared with acid red soil, loess soil is a kind of soil with weak phosphorus uptake ability. The most suitable parameter to evaluate its phosphorus uptake capacity is the maximum phosphorus uptake (qm) obtained from simple Langmuir equation. The soil properties dominated by qm Is free oxygen iron content, followed by clay and CaCO_3 content. Loess soil desorption ability of adsorbed phosphorus is very strong, its isotherm desorption curve can also be divided into three regions, representing different levels of adsorbed phosphorus desorption process.