种植作物条件下粉砂壤质土壤水盐运移的数值模拟研究
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* 国家重点基础研究发展规划项目(G1999011803)经费支持


NUMERICAL SIMULATION OF SOIL SALT AND WATER TRANSPORT IN SILT LOAM SOIL UNDER PLANTING
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    摘要:

    利用大型水盐运动模拟土柱研究了在田间气候作用下作物(小麦-玉米连茬种植)生长对土壤水盐运移的影响.研究并建立了土壤水盐运移的数学模型,就模型所需的饱和导水率、水力传导度、水分特征曲线、水动力弥散系数进行了室内外测定,并对数学模型进行了数值求解.对四个土柱的模拟结果与实测结果进行了数据分析和对比.结果表明:数值模拟结果和实测数据比较,除个别点有一定偏离之外,模拟计算结果与实测值拟合效果比较理想,说明该模型用于模拟种植作物条件下粉砂壤质土壤的水盐运移是实际可行的.

    Abstract:

    Effects of planting on soil salt and water transport in silt loam soil were studied by means of big column experiment in the Laboratory of Water and Salt Regime,Fengqiu Agroecologic Experimental Station,Chinese Academy of Sciences. Models of soil salt and water transport were developed separately.Also,parameters such as saturated transmissibility(Hs),hydraulic conductivity(K),water characteristic curve h(θ)and coefficient of soil hydrodynamic dispersion(D)were measured indoors or in fields.The simulated and the measured results were analyzed and compared in detail,showing that the simulated results were very ideal.The rise of the groundwater table was of advantage to movement of salt and water in the silt loam soil column,which obviously leading to redistribution of salt in the soil column.As a result,the salt content of the soil at the depth of 20 cm was higher than that of the surface soil.So it is practicable to do numerical simulation of the soil salt and water transport by this model.Furthermore,if the actual movement of salt and water in fields should be described in detail,further study must be conducted.

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徐力刚,杨劲松,张妙仙.种植作物条件下粉砂壤质土壤水盐运移的数值模拟研究[J].土壤学报,2004,41(1):50-55. DOI:10.11766/trxb200301040108 Xu Ligang, Yang Jinsong, Zhang Miaoxian. NUMERICAL SIMULATION OF SOIL SALT AND WATER TRANSPORT IN SILT LOAM SOIL UNDER PLANTING[J]. Acta Pedologica Sinica,2004,41(1):50-55.

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  • 收稿日期:2003-01-04
  • 最后修改日期:2003-06-15
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  • 在线发布日期: 2013-02-25
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