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研究了银北4种主要土壤对磷的吸附特性.结果:4种土壤的实测吸附曲线与Freundlich、Lanemuir和Femkin3种等温吸附方程吻合,相关极显著,又以Langmuir等温吸附方程最为吻合;银北土壤对磷的最大吸附量(X_m)在297～654μg/g之间,平均为433.8±42.8μg/g,较银南的大,为较强供磷能力的土壤;4种土壤的最大吸磷量与物理性粘粒、CaCO_3、CEC的大小呈显著正相关,而与pH、有机质、有效磷相关不显著;土壤的解吸磷与吸附磷量呈直线正相关,吸磷量大的解吸量也大;根据研究所得等温吸附曲线预测银北土壤的施磷量比银南的高,且与实践相符.
The results showed that the adsorption curves of four soils were in good agreement with the isotherm adsorption equations of Freundlich, Lanemuir and Femkin, and the correlation coefficients were very significant, which was in agreement with the Langmuir isotherm equation. The maximum adsorption capacity of phosphorus to soil (X_m) ranged from 297 to 654μg / g with an average of 433.8 ± 42.8μg / g, which was higher than that of Yinnan and was the soil with strong phosphorus supply. The maximum phosphorus uptake There was a significant positive correlation between the amount and the amount of physical clay, CaCO_3 and CEC, but not with pH, organic matter and available phosphorus. There was a linear positive correlation between desorption and amount of phosphorus adsorbed by soil, According to the isothermal adsorption curve obtained from the study, it is predicted that the phosphorus application rate in Yinbei soil is higher than that in Yinnan soil and is consistent with practice.