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草酸对砖红壤的还原-溶解及其与磷素释放的耦合关系

杨杰文 钟来元 郭荣发 周鸿凯

杨杰文, 钟来元, 郭荣发, 周鸿凯. 草酸对砖红壤的还原-溶解及其与磷素释放的耦合关系[J]. 环境科学研究, 2010, 23(10): 1257-1261.
引用本文: 杨杰文, 钟来元, 郭荣发, 周鸿凯. 草酸对砖红壤的还原-溶解及其与磷素释放的耦合关系[J]. 环境科学研究, 2010, 23(10): 1257-1261.
YANG Jie-wen, ZHONG Lai-yuan, GUO Rong-fa, ZHOU Hong-kai. Coupling of Oxalic Acid-Promoted Reductive Dissolution of Latosol and Phosphorous Mobilization[J]. Research of Environmental Sciences, 2010, 23(10): 1257-1261.
Citation: YANG Jie-wen, ZHONG Lai-yuan, GUO Rong-fa, ZHOU Hong-kai. Coupling of Oxalic Acid-Promoted Reductive Dissolution of Latosol and Phosphorous Mobilization[J]. Research of Environmental Sciences, 2010, 23(10): 1257-1261.

草酸对砖红壤的还原-溶解及其与磷素释放的耦合关系

基金项目: 国家自然科学基金面上项目(40871156)

Coupling of Oxalic Acid-Promoted Reductive Dissolution of Latosol and Phosphorous Mobilization

  • 摘要: 砖红壤中铁、铝氧化物对P素的强烈吸附和包蔽是这类土壤P素生物有效性低的主要原因,P素释放与土壤的还原-溶解过程关系极其密切. 通过研究草酸对砖红壤的还原-溶解反应,以揭示溶液中c(Fe),c(Al)和c(P)以及pH的动态变化规律,阐明溶液pH条件以及2种陪伴金属阳离子(铝离子和铜离子)对Fe,Al和P释放数量的影响. 结果表明,在所研究的24 h反应时间内,溶液c(总Fe)在第12小时达到最大值后逐渐下降,pH在第12小时达到最大值后则保持不变;溶液c(Al)逐渐升高,而c(P)则表现出下降趋势. 这说明溶液中c(Fe),c(Al)和c(P)以及pH主要受土壤固相还原-溶解反应与离子表面吸附反应的相对强弱控制. 低pH条件有利于土壤还原-溶解反应的进行,促进Fe,Al和P释放到土壤溶液. 此外,溶液中c(Al)和c(P)差异明显,而c〔Fe(Ⅱ)〕和c(P)之间差异较小,表明草酸还原-溶解砖红壤过程中,Fe(Ⅱ)和P释放基本同步进行. 铝离子或铜离子对草酸还原-溶解砖红壤过程有抑制作用,可降低平衡溶液中c(P)和c〔Fe(Ⅱ)〕.

     

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出版历程
  • 收稿日期:  2010-03-20
  • 修回日期:  2010-06-04
  • 刊出日期:  2010-10-25

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