根据STVF理论研究温度对黄绵土持水特征曲线的影响

The Effect of Temperature Upon Water Holding Characteristic Curves in Cultivated Loess Soil Based on the Study of STVF Theory

根据温度对土壤持水性能影响的表面张力粘滞流(STVF)理论,建立了在一定含水量条件下土壤水势φ与温度T的函数关系,黄绵土水势的温度系数C_φ测定的实验结果表明,C_φ与含水量θ_v的大小(0～-100kPa的水势范围内)有很好的线性关系。由此用理论关系式预测的不同温度下的黄绵土持水特征曲线(脱水过程)与实验测定结果较为一致。说明在含水量较高时,黄绵土的φ～T关系是可预计的。

Based on the temperature effects upon soil water-holding capacity by surface tension and viscosity Flow theory,the function relationship between soil water potential ψ and temperature T was set up under the different conditions of water contents. The results determined by water potential coefficient Cψ in cultivated loess soil indicate that the megnitudes of Cψ and θv water contents (within the range of water poten-tial of 0~100 kPa) have a very good residual relationship. Therefore,the theoretical e-quation to have been employed to predict waterholding capacity characteristic curves in cultivated loess soil (the dewater process)in the case of different temperatures are in a-greement with experimtally-determined results,thus,indicating that when water content is high,the relationship of -T in cultivated loess soil can be estmated.