中文摘要：

采用连续液流法研究了长期定位施肥潮土K^＋解吸的动力学特性。结果表明，1）不同处理的土壤K^＋解吸的平衡时间和平衡解吸量有很大差异，平衡解吸量的变化与CEC和粘土中高岭石的含量密切相关；2）长期施肥使K^＋解吸速率产生了差异，解吸速率也与CEC、粘粒含量和高岭石的变化密切相关；3）不同处理在不同的反应阶段其解吸率差异很大，粘粒含量高的处理在反应初期解吸较快；4）平衡前不同时段的解吸速率和解吸率与反应时间1nt有极显著的线性相关，且与土壤粘粒含量密切相关；5）一级动力学方程是描述潮土中K^＋解吸过程的最优模型，该过程是扩散控制过程。

英文摘要：

The characteristics of K^＋ desorption kinetics on noncalcareous fluvo-aquic soil under long-term fertilization condition were studied using the liquid flow technique. The results indicated that： 1） There were great differentia on K^＋ equilibrium desorption time and quantity among the different treatment, respectively. K^＋ equilibrium desorption quantity was closely related with CEC and kaolinite content; 2） Long-term fertilization caused a discrepancy on desorbing velocity, which were also related with clay content, CEC and kaolinite content; 3） There exist differentia in different reaction phases on K^＋ desorbing percentage, e.g. whose desorbing percentage rose fast at initial phase, but with high clay content; among different treatments; 4） There was a linear relationship between desorption velocity and the reaction time （1nt）, and desorption velocity was closely related with soil clay content; 5） First-order kinetic equation was the best model for K^＋ desorption and the K^＋ desorption was controlled by the diffussion process.