新疆几种耕地土壤钾吸附与解吸特性研究

The Research on the Adsorption and Desorption Kinetics Characteristics of Potash in Some Cropland Soils of Xinjiang

采用连续液流法研究新疆 6种不同土类的耕地土壤 K+ 吸附与解吸的动力学特性。结果表明 :1不同土类土壤 K+ 吸附与解吸的反应平衡时间有很大不同 ,其中 ,水稻土、灰漠土达到吸附和解吸的平衡时间与灰钙土达到解吸平衡的时间比其它土类达到平衡的时间要长 ,且平衡以后 ,K+的吸附量或解吸量仍有明显的增加。 6种土类的吸附、解吸时间及平衡吸附、解吸量同土壤粘粒含量有关。 2平衡前不同时段的吸附、解吸速度和吸附、解吸率与反应时间 lnt有极显著的线性相关 ,且与土壤粘粒含量密切相关。 3一级反应方程是描述土壤 K+

The kinetics characteristics of K + adsorption and desorption in six types cropland soils of Xinjiang were studied by using the continuous liquid flow technique.The results showed that:① The reaction equilibrium time of K + adsorption and desorption in different type soils were different greatly.The reaction equilibrium time of K + adsorption and desorption in the rice soil and the grey desert soil and the reaction equilibrium time of K + desorption in the sierozen were longer than that in those other soils.The capactity of K + adsorption and desorption still increased obviously and continually in these soils after the equilibrium.The adsorption and desorption time and adsorption and desorption equilibrium capacity in the six soils were closely related with the soil clay content.② The velocities and the rates of the adsorption and desorption in the different periods before the equilibrium had a linear relationship with the reaction time ln t .They were close related with the soil clay content.③ The first order equation was the best kinetics model for describing the K + adsorption and desorption respectively.