摘要
为分析红壤地区土壤容重对水分入渗的影响并将其应用于指导灌溉生产,以江西红壤土为研究对象,采用垂直一维入渗方式模拟土壤容重对红壤中水分垂直运动规律影响.结果表明:在同一时刻湿润锋、累积入渗量、入渗率均随土壤容重的增大而减小,时间对湿润锋运移及累积入渗量影响程度相比于土壤容重较高,湿润锋与累积入渗量呈线性关系;入渗初期土壤容重对入渗率影响程度较高,随着入渗的进行其影响程度逐渐减小;饱和导水率与土壤容重呈负幂函数关系,Green-Ampt模型与Philip模型中饱和导水率模拟值在土壤容重大于1.30 g/cm3时相对误差小于9.62%,计算精度较高;再分布过程中,土壤容重越大,同一土层高度上土壤含水量越小,0~50 cm土层中土壤含水量随再分布时间增大而明显减小,土壤容重对含水量影响具有统计学意义(P<0.05),50~70 cm土层中土壤容重对其变化影响不具有统计学意义.该研究成果可为红壤地区农作物的灌溉提供理论支撑.
In order to analyze the effect of soil bulk density on soil water infiltration in red loam areas and to apply it to irrigation production,Jiangxi red loam was taken as the study object.The experiment utilized the one-dimensional water vertical infiltration to simulate how soil bulk density influences the water in red loam.The results show that the wetting front and cumulative infiltration volume and infiltration rate at the same time decreased with soil bulk density increasing.Time had more significant effects on the wetting front migration and accumulative infiltration capacity than the bulk density,and the linear relationship between wetting frag and cumulative infiltration was established.Bulk density had great effect on infiltration in the initial time of infiltration,then the effect gradually weakened inthe process of infiltration.Saturated hydraulic conductivity and soil bulk density showed a negative power function relationship.In Green-Ampt model and Philip model,the relative error of saturated hydraulic conductivity is less than 9.62% and the calculation accuracy of the two models is higher when the soil bulk density is more than 1.30 g/cm^3.During the redistribution period,the water content at the same soil depth decreases with soil bulk density increasing.The soil water content decreases with the increase of redistribution at the soil depth of 0-50 cm,and the soil bulk density has a significant effect on water content（P〈0.05）,the soil bulk density has a non-significant effect on water content at the soil depth of 50-70 cm.The results provide a theoretical support for crops irrigation in red loam areas.
出处
《排灌机械工程学报》
EI
CSCD
北大核心
2017年第12期1081-1087,共7页
Journal of Drainage and Irrigation Machinery Engineering
基金
国家重点研发计划项目(2016YFC0400204)
国家自然科学基金资助项目(51279157
51479161)
国家农业公益项目(201203003-1)
关键词
红壤
土壤容重
垂直入渗
再分布
含水量
red loam
soil bulk density
vertical infiltration
redistribution
water content
