摘要
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 water characteristic curve of sandy loam loess in lab, this research discussed whether the Gardner model was suitable for specific water capacity of sandy loam loess, and especially analyzed the sensitivity of Gardner model parameters to the variation of soil bulk density. The results showed： Gardner model was suitable to fit in sandy loam loess, and the square of correlation coefficient （R2） was bigger than 0.97, so it had a very good fitting effect; at low suction range, the specific water capacity significantly increased with the increase of bulk density; at middle and high suction range, it tended to be stable with the increase in bulk density of dry soil. So the effect of variation in soil bulk density on specific water capacity was mainly obvious in low suction range. For the two parameters A and B in Gardner model which characterized the specific water capacity, the sensitivity of parameter A was much greater than that of parameter B, and the variation in soil bulk density was a sensitive factor of parameter A and not of parameter B. Moreover, the curve parameters A and B showed the same direction change with soil bulk density.
出处
《土壤通报》
CAS
CSCD
北大核心
2016年第4期814-819,共6页
Chinese Journal of Soil Science
基金
国家自然科学基金项目(40671081)
山西省地面灌溉节水技术参数手册研编(2015-JS-1)资助
