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机构地区:[1]天津农学院水利工程系,天津300384 [2]天津农学院园艺系,天津300384
出 处:《湖北农业科学》2010年第9期2126-2129,共4页Hubei Agricultural Sciences
摘 要:以下层潮棕壤土为对象,以硫酸铵为溶质,采用水平土柱入渗法对不同入渗溶液浓度(0、50、100和150g/L)的土壤水分扩散系数D(θ)和非饱和土壤水动力弥散系数Dsh(θ)进行了试验和分析。结果表明,土壤水分扩散系数和土壤水动力弥散系数随着含水率θ的增大而增大。θ较小时,土壤溶液的粘滞性对水分扩散有显著影响;θ较大时,粘滞性下降,其影响变弱。随着θ的增大,C0对Dsh(θ)的影响越来越明显。D(θ)始终大于Dsh(θ)。In this study,ammonium sulphate((NH4)2SO4) was used as solute,the soil water diffusivity coefficient(D(θ)) and hydrodynamic dispersion coefficient(Dsh(θ)) of different concentrations of infiltration solution(0,50,100 and 150g/L) on unsaturated brown soil were measured by horizontal infiltration method,the results showed that(1) coefficient of hydrodynamic dispersion(Dsh(θ)) and soil water diffusivity coefficient(D(θ)) all increase with water content θ;(2) when the θ was small,the influence of the viscosity of soil solution on the water diffusion was obvious.When the θ was high,the viscosity depress,and the effect of it on D(θ) become weak;(3) the influence of C0 on the Dsh(θ) was obvious with the growth of θ;(4) the value of D(θ) was higher than the value of Dsh(θ).
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