| 摘要: |
| 采用Ｈ饱和树脂吸收法研究了陕西6种土壤非交换钾释放的动力学性质。结果表明：①黄土性土壤非交换钾释放量和释放速度与风砂土类似,远高于暗棕壤；②供试土壤不同时段的非交换钾释放速度不同，0～72h的释放速度远大于72～912h的钾释放速度；③供试土壤非交换钾释放过程在912h内用直线方程描述拟合最好；④供试土壤非交换钾释放速率常数B主要决定于粘粒与缓效钾含量。常数B和非交换钾释放速度V可用于土壤供钾能力评价。 |
| 关键词: 土壤，非交换钾，钾释放动力学，陕西 |
| DOI： |
| 分类号:S153.3 |
| 基金项目: |
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| A Study on the Kinetics of Nonexchangeable Potassium Release from the Soil in Shaanxi |
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| Abstract: |
| The kinectics characteristics of the nonexchangeable potassium release from the soil in Shaanxi is investigated with the Hsaturated resin absorbing method.The results indicate that:① The quantity and velocity of the nonexchangeable potassium release from the loess soils are alike to sand soil,and are higher than the dark brown forest soil.② The velocity of the nonexchangeable potassium release from the soil tested is different at different stages of time.The velocity of the nonexchangeable potassium release is more highly marked in 0～72 hours than in 72～912 hours.③ The process of the nonexchangeable potassium release from the soil tested in 912 hours can be well described with linear equation. ④The constant B rate of the nonexchangeable potassium release from the soil tested is controlled by the content of clay and slowly available K.The contant B rate and the average velocity V of nonexchangeable potassium release can be used for the evaluation of the capability of soil supporting potassium to plant. |
| Key words: soil,nonexchangeable potassium release,kinetics of potassium release,Shaanxi Province |
