Phosphorus absorbed and immobilized in rhizosphere was less than that of in root zone and unroot zone . 2 . the isothermal adsorption curve of each can be partition into two parts . phosphorus adsorption amount and phosphorus consistency slope in equilibrium solution are relatively higher than the slope of phosphorus adsorption amount and phosphorus consistency when fertilizer amount added increasing continuously 土壤的等温吸附曲线可分成两个部分：当土壤平衡溶液浓度很低时，磷的吸附量与( x )磷的平衡溶液浓度( c )的曲线斜率较大；当施肥量不断增加后，土壤平衡溶液浓度也会随之不断增加，曲线斜率变小。
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