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为了研究长期施肥对冬枣园土壤钾素特征的影响,采用土培试验对枣园土壤的钾素含量、形态变化以及吸附、解吸特征进行了研究。结果表明,枣园土壤的各形态钾含量较对照土壤均有显著提高,水溶性钾、交换性钾和非交换性钾含量和全钾含量分别增加了117.22%、133.92%、60.55%和7.29%。与对照土壤相比,冬枣园土壤的钾吸附率和最大理论吸附量均较低,而解吸出的钾量则显著增加。Langmuir方程可以很好地拟合枣园土壤的钾吸附过程;而对于钾解吸过程,拟合效果最佳的是Elovich方程。
In order to study the effect of long-term fertilization on the characteristics of soil potassium in winter jujube orchards, the soil potassium content, morphological changes and adsorption and desorption characteristics of jujube orchards were studied by soil culture. The results showed that all forms of potassium in jujube orchard increased significantly by 117.22%, 133.92%, 60.55% and 7.29% compared with the control soils, respectively. The contents of soluble potassium, exchangeable potassium and non-exchangeable potassium and total potassium were increased by 117.22% . Compared with the control soil, the jujube garden soil potassium adsorption rate and the maximum theoretical adsorption capacity were low, while the desorption of potassium was significantly increased. The Langmuir equation can well fit the potassium adsorption process of jujube orchard soil. For the desorption process of potassium, the Elovich equation is the best fitting effect.