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低分子量有机酸作用下土壤矿物钾释放机理研究

发表时间:2009-08-31  浏览量:1512  下载量:708
全部作者: 王东升
作者单位: 辽宁工程技术大学资源与环境工程学院
摘 要: 在低分子量有机酸作用下,含钾矿物和土壤钾的释放是酸性水解和络合溶解双重作用的表面化学反应过程。草酸具有较强的酸性水解和络合能力,其活化钾的能力最强,能够有效地活化土壤矿物钾。苹果酸、酒石酸、柠檬酸、乙酸和乳酸亦可有效地促进白云母和钾长石的分解,但受土壤物质组成和土壤颗粒表面作用的影响,活化土壤矿物钾的能力比较弱。低分子量有机酸作用下,土壤钾的释放具有明显的阶段性,可分为快速释放和平稳释放两个阶段。Elovich方程(R2为0.878~0.998)和Power方程(R2为0.901~0.987)能很好地反映和预测低分子量有机酸作用下土壤矿物钾的释放过程。
关 键 词: 土壤肥力;低分子量有机酸;土壤矿物钾;释放
Title: Study on the mechanism of soil mineral potassium release extracted by low-molecular-weigh organic acids
Author: WANG Dongsheng
Organization: College of Resource and Environment Engineering, Liaoning Technical University
Abstract: The mechanism of soil mineral potassium release extracted by low-molecular-weigh organic acids was the result of acidic hydrolysis and complexation reaction with soil. Oxalic acid has higher mobilization effect on the soil mineral potassium release than the others. It's because the oxalic acid has powerful capability of acidic hydrolysis and complexation to extract more K from soil. Malic acid, tartaric acid, citric acid, acetic acid and lactic acid also can effectively promote decomposition of white mica and potassium feldspar, but they are influenced by soil material composition and soil particle surface action, so their mobilization effect on the soil mineral potassium are weaker. The soil potassium release is evidently stepwise under the action of low-molecular-weight organic acids. It can be divided into two steps: fast release step and steady release step. Elovich equation (R2=0.878~0.998) and dual constant equation (R2=0.901~0.987) have good fitting effect, and they can well reflect and predict the soil mineral potassium release process under the action of low-molecular-weight organic acids.
Key words: soil fertility; low-molecular-weight organic acids; soil mineral potassium; release
发表期数: 2009年8月第16期
引用格式: 王东升. 低分子量有机酸作用下土壤矿物钾释放机理研究[J]. 中国科技论文在线精品论文,2009,2(16):1647-1652.
 
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