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基于砂壤黄土的室内土壤水分特征曲线系列试验,讨论了砂壤黄土比水容量对Gardner经验模型的适用性,重点分析Gardner经验模型参数对土壤容重变化的敏感性。试验结果表明:Gardner比水容量经验模型对砂壤黄土具有很好的适用性,拟合的决定系数R2均达到0.97以上,具有较好的拟合效果;在低吸力段,比水容量随着土壤干容重的增大而增大,增幅明显;在中、高吸力段,比水容量随着土壤干容重的增大而趋于平缓,因此砂壤黄土容重变异对比水容量的影响主要集中于低吸力段;表征比水容量的Gardner经验模型的两个参数A和B中,参数A的敏感度mA远大于参数B的敏感度mB,土壤容重变异是参数A的敏感因素,参数B的非敏感因素,比水容量曲线参数A、B均与容重变异同方向变化。
Based on the series of indoor soil moisture curves of sandy loess, the applicability of specific water capacity of sandy loess to Gardner empirical model was discussed, and the sensitivity of Gardner empirical model parameters to the change of soil bulk density was analyzed. The experimental results show that Gardner has better adaptability to sand loess than the water capacity empirical model, and the coefficient of determination of fitting R2 is above 0.97, which shows good fitting effect. In the low suction section, In the medium and high suction section, the specific water capacity tends to be gentle with the increase of soil bulk density, so the influence of bulk density variation of sandy loam on water capacity is mainly concentrated in Low suction section; in the two parameters A and B of the Gardner empirical model, which represent the specific water capacity, the sensitivity mA of the parameter A is much greater than the sensitivity mB of the parameter B; the variation of soil bulk density is the sensitive factor of the parameter A; Sensitive factors, than the water volume curve parameters A, B and bulk density variation in the same direction.