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Position: Home > Articles > Release Kinetics of Nonexchangeable Potassium in an Orchard Soil of Winter Jujube Chinese Agricultural Science Bulletin 2015,31 (10) 221-225

冬枣果园土壤非交换态钾的释放动力学

作  者:
王清华;杜振宇;马丙尧;刘方春;马海林
单  位:
山东省林业科学研究院
关键词:
冬枣;果园土壤;钾释放;非交换态钾;动力学方程
摘  要:
为了研究长期施肥条件下冬枣果园土壤非交换态钾的释放特征,以Ca Cl2和柠檬酸溶液为浸提剂,采用连续提取的方法对枣园土壤的非交换态钾释放动力学进行研究。结果表明,枣园土壤非交换态钾在释放过程中表现出快速释放和缓慢释放2个连续的阶段。快速释放阶段(<188 h)的累积释放量占到总释放量的53.6%~59.2%,而在缓慢释放阶段(188~1244 h)的释放量不及总量的一半。在相同时间内,使用柠檬酸溶液浸提时,非交换态钾的释放量明显高于使用Ca Cl2溶液时的释放量。相比之下,冬枣果园土壤非交换态钾的释放量明显高于对照土壤。在5种动力学方程中,幂函数方程是描述冬枣果园土壤非交换态钾释放的最优模型。
译  名:
Release Kinetics of Nonexchangeable Potassium in an Orchard Soil of Winter Jujube
作  者:
Wang Qinghua;Du Zhenyu;Ma Bingyao;Liu Fangchun;Ma Hailin;Shandong Academy of Forestry Science;State Key Laboratory of Soil and Sustainable Agriculture/Institute of Soil Science, Chinese Academy of Sciences;
关键词:
winter jujube;;orchard soil;;K release;;nonexchangeable K;;kinetics equations
摘  要:
In order to explore release characteristics of nonexchangeable potassium(K) in winter jujubeorchard(WJO) soil, the release kinetics of nonexchangeable potassium by Ca Cl2 and citric solution werestudied by using a successive extraction method. The results showed that the soil nonexchangeable K releasewas comprised of two processes: rapid and slow ones. In the rapid release process(<188 h), accumulative Krelease amount occupied 53.6%-59.2% of the total amount, but only less than 50% in slow release process(188-1244 h). The K release amount in citric solution was higher than that in Ca Cl2 solution at the same time.By comparison, the K release amount of WJO was higher compared with the control. The power functionequation was the best model for describing nonexchangeable K release in WJO soil.

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