砂壤黄土比水容量对土壤容重变异敏感性分析

发布时间：2018-04-17 09:46

本文选题：比水容量 + 土壤容重　；参考：《土壤通报》2016年04期

【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。
[Abstract]:Based on a series of experiments on soil moisture characteristic curves of sandy soil loess, the applicability of specific water capacity of sandy soil loess to Gardner empirical model was discussed, and the sensitivity of Gardner empirical model parameters to soil bulk density variation was analyzed.The experimental results show that the empirical model of specific water capacity of 1: Gardner has a good applicability to sandy soil loess, and the fitting coefficient R2 is more than 0.97, which has a good fitting effect in the low suction section.The specific water capacity increases with the increase of soil dry bulk density, while in the middle and high suction section, the specific water capacity tends to be flat with the increase of soil dry bulk density.Therefore, the effect of bulk density variation of sandy soil loess on water capacity is mainly concentrated in the low suction section, and in the two parameters A and B of the Gardner empirical model, which characterizes the specific water capacity.The sensitivity of parameter A was much higher than that of parameter B. the variation of soil bulk density was the sensitive factor of parameter A.
【作者单位】：太原理工大学;
【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
【分类号】：S152.5

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