两种土壤传递函数在预测砒砂岩与沙复配土的水力学参数中的应用

The Application of Two Soil Pedo-Transfer Function to Predict Hydraulic Parameters of Soft Rock and Sand Compound Soil

为选择一种适合于预测砒砂岩与沙复配土水力学参数的土壤传递函数模型,从而为有针对性的对不同比例下砒砂岩与沙复配土采用不同的田间灌溉管理方式提供科学依据。在测定七种比例的砒砂岩与沙复配土的饱和导水率的基础上,分析比较了HYPRES和Rosetta这两种土壤传递函数模型对复配土土壤饱和导水率的预测能力。结果显示Rosetta模型的适应性更佳,在实际应用中可采用该模型对砒砂岩与沙复配土的土壤水力学参数进行预测。在Rosetta模型的预测下,随着复配土中砒砂岩比例的增加,萎蔫系数变幅不大,田间持水量逐渐增大,饱和含水量基本上呈现逐渐减少的趋势,有效持水量和储水量也逐渐增加。

Choosing optimum soil transfer function model that is suitable for forecast hydraulics parameters of soft rock and sand compound soil can provide the scientific basis to select different field irrigation to soft rock and sand compound soil in different rations. Through the analysis of the saturated hydraulic conductivity of seven sorts of soft rock and sand compound soil, this paper measures and compares the predicted ability to soil saturated hydraulic conductivity of HYPRES and Rosetta soil transfer function model. The results show that Rosetta model＇s compatibility is optimum, therefore can be used to forecast the hydraulics parameters of soft rock and sand compound soil in practice. Through the forecast of Rosetta model, the permanent wilting coefficient amplitude vary little, and the field capacity increases gradually, and the saturation moisture content basically presents the tendency of reducing gradually, and the available water capacity and water storage capacity also increase gradually.