微咸水入渗下施加石膏对盐碱土水分运动特征的影响

发布时间：2018-04-09 11:22

  本文选题：微咸水　切入点：盐碱土　出处：《水土保持学报》2016年04期

【摘要】：基于一维垂直土柱积水入渗和水平土柱吸渗试验,研究了微咸水入渗条件下,石膏施量(0,0.1,0.2,0.4,0.6kg/m~2)对盐碱土入渗特性及水动力参数的影响。结果表明:(1)微咸水入渗条件下,施加石膏能够降低土壤入渗速率,增加土壤保水性能;随石膏施量的增大,Philip入渗模型吸渗率S逐渐减小并趋于稳定。(2)随着石膏施量的增加,饱和体积含水率增加,而饱和导水率减小,其变化均符合二项式关系。(3)van Genuchten模型参数α值随着石膏施量的增加而减小,而土壤水分特征曲线指数n值增大。(4)土壤水分扩散率随着石膏施量的增加而递减,当石膏施量0.4kg/m~2时,土壤水分扩散率趋于稳定。施加石膏能够改善微咸水在盐碱土中的水分运动特性,提高微咸水利用率。
[Abstract]:Based on one-dimensional vertical soil column infiltration test and horizontal soil column infiltration test, the effect of gypsum application on infiltration characteristics and hydrodynamic parameters of saline-alkali soil was studied under the condition of brackish water infiltration.The saturated volume water content increased, but the saturated water conductivity decreased. The change of the saturated water conductivity was consistent with the binomial relation. The parameter 伪 value of the Genuchten model decreased with the increase of gypsum application rate.The soil water diffusivity decreased with the increase of gypsum application rate, and the soil water diffusion rate tended to be stable when the gypsum application amount was 0.4 kg / m ~ 2.The application of gypsum can improve the water movement characteristics of brackish water in saline-alkali soil and increase the utilization ratio of brackish water.
【作者单位】： 西安理工大学水利水电学院西北旱区生态水利工程国家重点实验室培育基地;西北农林科技大学水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室;
【基金】：水利部公益性行业科研专项(201301102) 新疆水利科技项目(2015Y11)
【分类号】：S152.7
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本文编号：1726208