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实测的等温吸附曲线与常用的Ｆｒｅｕｎｄｌｉｃｈ、Ｌａｎｇｍｕｉｒ及Ｔｅｍｋｉｎ的吸附模式均很吻合，全部相关系数均达极显著水平。由吸附曲线得到的土壤对磷的吸附特性值（ｋ·ｘｍ）差异较大，东部地区较西部高，覆盖黑垆土＞黄绵土＞黑麻土＞灌漠土。影响土壤吸磷的因素主要是土壤有机质含量和阳离子代换量（ＣＥＣ），有机质含量越高，土壤对磷的吸附结合能越小，而吸磷量增加；土壤吸附磷的解吸曲线不同层次与土壤吸附磷的结合方式不同有关。水溶性磷加入土壤后，首先形成二钙磷，其次是Ａｌ－Ｐ，再次是八钙磷，并逐渐形成更难溶的磷酸盐形式
The measured isothermal adsorption curves are in good agreement with the Freundlich, Langmuir and Temkin sorption modes, and all the correlation coefficients reached significant levels. The adsorption characteristics of phosphorus (k · xm) in soil from adsorption curves are quite different. The eastern part is higher than the western part, covering black loess soil> loessial soil> black soil soil> desertified soil. Soil organic matter content and cation exchange capacity (CEC) were mainly affected by soil P uptake. The higher the organic matter content was, the smaller the soil P adsorption binding energy was, and the P uptake increased. The soil desorption curve at different levels Soil adsorption phosphorus binding different ways. When water-soluble phosphorus is added to the soil, first, calcium phosphate is formed, followed by Al-P, again octacalcium phosphate, and gradually more soluble phosphate forms