蒙脱石对不同施肥处理土壤胡敏酸及其级分的吸附特征Ⅰ.蒙脱石对胡敏酸的吸附特征
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* 博士点基金;国家自然科学基金(39800093)资助


CHARACTERISTICS OF ADSORPTION OF HLTMIC ACIDS AND ITS FRACTIONS FROM SOILS WITH DIFFERENT FERTILIZATION BY MONTMORILLONITE Ⅰ.THE ADSORPTION OF HUMIC ACID BY MONTMORILLONITE
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    摘要:

    以17年不同施肥处理土壤胡敏酸为材料,研究了不同性质胡敏酸与钙饱和蒙脱石的吸附特征.结果表明,钙饱和蒙脱石对土不同施肥处理胡敏酸的吸附曲线可用单表面Langmuir方程、双表面Langmuir方程以及Freundlich方程来描述.由单表面Langmuir方程计算的有机肥处理(厩肥、秸秆)胡敏酸的吸附量和吸附强度大于无肥、化肥处理.温度升高各处理胡敏酸吸附量增加,但吸附强度下降.双表面Langmuir揭示,蒙脱石对胡敏酸的吸附呈现高低两种能位的吸附.高能点位的吸附以化学吸附为主,是吸热反应,低能点位的吸附以物理吸附为主,是放热反应.有机肥处理和无肥、化肥处理相比,高能点位吸附相对减弱,低能点位吸附相对增强.

    Abstract:

    In this paper, characteristics of adsorption of humic acids from soils with different fertilization (for 17 years) by Ca-saturated montmorillonite was investigated. The main results showed that adsorpton isotherms of humic acids by montmorillonite could be described by singe surface Langmuir, Freundlich and double-surface Langmuir equations. Adsorption amount of humic acid increased as temperature rose, while adsorption strength decreased. Applying organic material could increase adsorption amount and strength of hunuc acids compared with no fertilizer and chemical fertilizer. The double-surface Langmuir equation indicated that humicacid adsorption by montmorillonite had two energy sites-the high and the low levels. Adsorption of humic acid on the high energy site was mainly chemical absorption which was an endothermic reaction. On the other hand, the adsorption of humicacid on the low energy site was mainly physical absorption, which was an exothermic reaction. With application of organic material, absorption of humic acids on the high energy site became weaker and that on the low energy site absorption became stronger compared with no fertillizer and chemical fertilizer.

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王旭东,张一平,胡田田,于澄宇.蒙脱石对不同施肥处理土壤胡敏酸及其级分的吸附特征Ⅰ.蒙脱石对胡敏酸的吸附特征[J].土壤学报,2000,37(4):506-513. DOI:10.11766/trxb199908100410 Wang Xu-dong, Zhang Yi-ping, Hu Tian-tian, Yu Chen-yu. CHARACTERISTICS OF ADSORPTION OF HLTMIC ACIDS AND ITS FRACTIONS FROM SOILS WITH DIFFERENT FERTILIZATION BY MONTMORILLONITE Ⅰ. THE ADSORPTION OF HUMIC ACID BY MONTMORILLONITE[J]. Acta Pedologica Sinica,2000,37(4):506-513.

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  • 收稿日期:1999-08-10
  • 最后修改日期:2000-05-25
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  • 在线发布日期: 2013-02-25
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