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为计算黄土高原3种土壤不同温度下的非饱和土壤导水率,采用土壤水分动力学方法和数值模拟,利用室内试验分别对3种土壤在不同温度下的土壤水分特征曲线,湿润峰下渗速率以及湿润峰湿度与湿润剖面平均湿度的关系进行了定量研究。得到了以下结果:(1)建立了黄土高原3种土壤非饱和土壤导水率温度效应的定量模型:K(θ)=ΔTaθb+KTre,本模型为了解田间土壤水分的动态变化及评价土壤水分有效性提供了理论依据。(2)在已有模型的基础上,计算了不同含水量下,温度升高1℃所引起非饱和土壤导水率和土壤有效水的净增加量,并推导出更为直观的温度对土壤水分传导有效性影响的定量模型,可以直接计算不同温度下非饱和土壤导水率的温度效应。
In order to calculate the unsaturated soil hydraulic conductivity of three soils at different temperatures in the Loess Plateau, soil moisture dynamics and numerical simulation were used. The indoor soil moisture characteristics curves and the wetting peak infiltration Rate and the relationship between wetting peak humidity and wetting profile average humidity were quantitatively studied. The following results were obtained: (1) A quantitative model of temperature effect on unsaturated soil hydraulic conductivity of three soils in the Loess Plateau was established: K (θ) = ΔTaθb + KTre. In order to understand the dynamic changes of soil moisture and evaluate the effectiveness of soil moisture Provided a theoretical basis. (2) On the basis of the existing models, the net increase of unsaturated soil hydraulic conductivity and soil available water caused by the temperature increase of 1 ℃ under different water contents was calculated, and the more direct temperature effect on soil The quantitative model of the effect of moisture conductivity can directly calculate the temperature effect of unsaturated soil hydraulic conductivity under different temperatures.