非反应性物质在土壤中的迁移及其参数确定
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TRANSPORT OF NONREACTIVE SOLUTE IN SOIL AND THE DETERMINATION OF MODEL PARAMETERS
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    摘要:

    采用一维对流-水动力弥散方程(CDE)研究了非反应性化学物质在土壤中的迁移行为.通过实验研究了土壤团聚体大小和孔隙水流速对非反应性物质在土壤中迁移的影响.结果表明,对流-水动力弥散方程能较好地预报氚(3H2O)的穿透曲线和迁移行为,随着团聚体由小变大,3H2O在其土壤中的穿透曲线的溶质出流提前,而淋洗结束推迟,峰值变小,最佳拟合D值由小变大.流速增加,D值增大,扩散现象加剧,D和流速呈正比.这为进一步研究反应性农用化学物质在该土壤中的迁移行为,预报溶质在土壤中的迁移及其命踪创造了条件.

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    The classical one-domain model with convection-dispersion equation was used in this study for describing a nonreactive solute transport in soil.By the experimental studies on the effect of soil aggregate size and pore water velocity on the transport of nonreactive solute in soil column,it was found that:tritium breakthrough curves could be well predicted by convection-dispersion equation;with the increase of aggregate size,early breakthrough,tailing and small peak were more pronounced by tritium breakthrough curves in soil column,best fitted D value increased as well;and D was proportional to pore water velocity in this study,and dispersion increased with the increase of pore water velocity,which is of great importance for studying the transport of reactive solute in soils and for predicting the fate of agricultural chemicals in field conditions.

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朱红霞,马立望,H. M. Selim.非反应性物质在土壤中的迁移及其参数确定[J].土壤学报,1998,35(4):517-525. DOI:10.11766/trxb199611080411 Zhu Hong-xia, Ma Li-wang, H. M. Selim. TRANSPORT OF NONREACTIVE SOLUTE IN SOIL AND THE DETERMINATION OF MODEL PARAMETERS[J]. Acta Pedologica Sinica,1998,35(4):517-525.

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  • 收稿日期:1996-11-08
  • 最后修改日期:1997-02-03
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  • 在线发布日期: 2013-02-25
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