尿素浓度对土壤水分特征曲线及持水性的影响研究  

Effects of Different Urea Concentrations on Soil Water Characteristic Curve and Soil Water Retention

作　　者：董晓华[1,2] 郭梁锋 马海波 姚着喜[1] 刘旋旋 DONG Xiao-hua;GUO Liang-feng;MA Hai-bo;YAO Zhuo-xi;LIU Xuan-xuan(College of Hydraulic and Environment, Three Gorges University, Yiehang 443002, Hubei Province, China;Collaborative Innovation Center of Hubei Provinee,Wuhan 430072, China)

机构地区：[1]三峡大学水利与环境学院,湖北宜昌443002 [2]水资源安全保障湖北省协同创新中心,武汉430072

出　　处：《节水灌溉》2018年第1期45-47,51,共4页Water Saving Irrigation

基　　金：国家自然科学基金项目(40701024)

摘　　要：为了研究尿素浓度对砂型土壤水分特征曲线及持水性的影响,使用离心机测量了含0%、1%、4%、7%尿素质量浓度土壤的水分特征曲线,将测量结果与VG经典模型拟合,通过拟合结果讨论了尿素质量浓度对该试验条件下VG模型参数的影响,进而从不同角度分析尿素质量浓度持水性指标的影响。结果表明:随着土壤中尿素浓度和基质吸力的增大的土壤水分特征曲线向左运动明显且差异性增大,持水能力逐渐减弱。随着尿素浓度增大参数,α逐渐减小,受尿素影响程度相对较大;随着尿素浓度增大参数n逐渐增大,θs和θr逐渐减小,受尿素影响程度都相对较小。随着尿素浓度的增大,容水度、田间持水量、凋萎系数、全有效水范围梯级减小,持水能力减弱。In order to study the influence of urea concentration on sand soil water characteristic curve and field capacity,this paper uses the centrifuge to measure the water characteristic curves of soil containing urea concentration of 0%,1%,4% and 7%,respectively.The measurement results are fitted with the classical VG model and the influence of urea concentration on VG model parameters under the test condition is discussed based on the fitting result,then the influence of urea concentration on field capacity index is studied.The results show that with the increase of urea concentration,the water retaining ability gradually decreases,the value of parameter αgradually decreases and the effect of urea is relatively large,the value of parameter n gradually increases,the values of θsand θrgradually decrease,and the influence degree of urea is relatively small,the water capacity,field capacity,wilting coefficient,and total effective water range all decrease.

关 键 词：尿素浓度 土壤水分特征曲线 VG模型 比水容 田间持水量 凋萎系数 

分 类 号：S152.7[农业科学—土壤学]