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研究了不同温度下 ,土壤水势 ( ψ)和土壤含水量对土壤水分运动的影响。结果表明 ,在相同温度下 ,提高 ψ(或增加土壤含水量 )可提高非饱和土壤导水率 ( K) ,并有黄绵土 >土娄土的趋势。根据 K的对数值与 ψ拟合出线性方程 ,在生产实践中测定 ψ值 ,用此方程可计算出 K值 ,随着土壤含水量增加 ,K也提高 ,且呈正相关 ,在同一土壤含水量条件下 ,增加温度可提高 K,增加幅度土娄土 >黄绵土。由 K对数值与温度 ( t)回归出线性方程可看出 ,土娄土和黄绵土的水势温度效应 ( dψ/dt)与 K温度效应 ( dln K/dt)随 ψ增加而降低。
The effects of soil water potential (ψ) and soil water content on soil water movement under different temperatures were studied. The results showed that increasing ψ (or increasing soil water content) at the same temperature increased the hydraulic conductivity (K) of unsaturated soil and had the tendency of loessial soil> loess soil. According to the logarithmic value of K and ψ, the linear equation is fitted and the ψ value is determined in the production practice. The K value can be calculated by using this equation. With the increase of soil water content, K also increases and has a positive correlation. Under the same soil moisture content Under the conditions, increasing the temperature can increase K, increase the soil Lou soil> loess soil. From the linear regression equation between logarithm of K and temperature (t), it can be seen that the dψ / dt and dln K / dt of soil water and soil decrease with the increase of ψ.