基于分形理论的设施土壤水分特征曲线研究

采用现场调查取样与室内分析相结合的方法,研究了设施栽培条件下原状土壤和扰动土壤分形维数及其与水分特征曲线的关系,结果表明:在相同质地的情况下,分形维数随土壤容重的增大而增大;设施土壤水分特性曲线原状土分形维数与扰动土分形维数具有良好的线性关系;通过原状土与扰动土分形维数的关系来预测的原状土水分特征曲线在整个含水率范围内预测结果与实测值一致性较好,表明根据土壤扰动土分形维数来预测原状土水分特征曲线是可行的。

Soil Water Retention Curve Based on Fractal Theory in Greenhouse Soil

The relationship between the fractal dimension for soil water retention curve of the disturbed and undisturbed soil was studied in greenhouse soil. It was showed that on the condition of the same soil texture, fractal dimensions increased with the increasing of soil bulk density. There was significant linear relationship between the fractal dimension of the disturbed soil and that of the undisturbed soil. Based on the fractal dimension of soil weight distribution and soil water retention curve of Brook-Corey model, water retention curves of the disturbed and undisturbed soil were predicted. The results show that the predicted values of soil water retention curves fit the measured data. So, it is feasible to estimate soil water retention curve of the undisturbed soil based on the fractal dimension of the disturbed soil in the greenhouse soil.