土壤容重对红壤水分垂直入渗特性的影响
发布时间：2018-09-08 08:03
【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(P0.05),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.
[Abstract]:In order to analyze the effect of soil bulk density on water infiltration in red soil area and apply it to guide irrigation production, the vertical one-dimensional infiltration method was used to simulate the effect of soil bulk density on the vertical movement of water in red soil. The results showed that the cumulative infiltration and infiltration rate decreased with the increase of soil bulk density at the same time, and the influence of time on the migration and cumulative infiltration was higher than that on soil bulk density. The effect of soil bulk density on infiltration rate was higher at the beginning of infiltration, and gradually decreased with infiltration. There is a negative power function relationship between saturated water conductivity and soil bulk density. In Green-Ampt model and Philip model, the relative error of saturated water conductivity is less than 9.62 when the soil bulk density is greater than 1.30 g/cm3, and the accuracy of calculation is higher. The smaller the soil moisture content in the same soil layer height is, the smaller the soil moisture content in the soil layer of 50 cm decreases with the increase of the redistribution time. The effect of soil bulk density on water content was statistically significant (P0.05) soil bulk density in 50 ~ 70 cm soil layer had no statistical significance. The research results can provide theoretical support for crop irrigation in red soil area.
【作者单位】： 西安理工大学水资源研究所;南昌工程学院江西省水工程安全与资源高效利用工程研究中心;
【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)
【分类号】：S152
[Abstract]:In order to analyze the effect of soil bulk density on water infiltration in red soil area and apply it to guide irrigation production, the vertical one-dimensional infiltration method was used to simulate the effect of soil bulk density on the vertical movement of water in red soil. The results showed that the cumulative infiltration and infiltration rate decreased with the increase of soil bulk density at the same time, and the influence of time on the migration and cumulative infiltration was higher than that on soil bulk density. The effect of soil bulk density on infiltration rate was higher at the beginning of infiltration, and gradually decreased with infiltration. There is a negative power function relationship between saturated water conductivity and soil bulk density. In Green-Ampt model and Philip model, the relative error of saturated water conductivity is less than 9.62 when the soil bulk density is greater than 1.30 g/cm3, and the accuracy of calculation is higher. The smaller the soil moisture content in the same soil layer height is, the smaller the soil moisture content in the soil layer of 50 cm decreases with the increase of the redistribution time. The effect of soil bulk density on water content was statistically significant (P0.05) soil bulk density in 50 ~ 70 cm soil layer had no statistical significance. The research results can provide theoretical support for crop irrigation in red soil area.
【作者单位】： 西安理工大学水资源研究所;南昌工程学院江西省水工程安全与资源高效利用工程研究中心;
【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)
【分类号】：S152
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