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作 者 ：崔德杰1;2;刘永辉2;隋方功2;张玉龙1

期 刊 ：植物营养与肥料学报 2006年 12卷 2期 页码：213-218

关键词：长期施肥；钾解吸；潮土；化学动力学；

Keywords:long-term fertilization, K+ desorption, fluvo-aquic soil, kinetics,

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lnt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。

Abstract: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(lnt),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.

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