土壤间歇入渗水肥耦合特性试验研究  

Coupling characteristics of soil water and nitrogen under intermittent infiltration

作　　者：吴军虎[1] 费良军[1] 赵茜[1] 朱兴华[1] 

机构地区：[1]西安理工大学水资源研究所,西安710048

出　　处：《农业工程学报》2006年第4期28-31,共4页Transactions of the Chinese Society of Agricultural Engineering

基　　金：陕西省自然科学基金研究项目(2004E212);国家自然科学基金资助项目(50179030)

摘　　要：为研究肥液浓度对施肥条件下土壤间歇入渗特性的影响,通过不同肥液浓度土壤间歇入渗试验,分析了不同肥液浓度波涌灌溉土壤间歇入渗水肥耦合特性。结果表明:在周期入渗时间相同时,土壤间歇入渗量与间歇入渗率均随肥液浓度的增加而增大,在间歇入渗的的第一周期表现明显,以后各周期这种差异变化随周期数的增加而变缓。同时分析了土壤间歇入渗量随肥液浓度增渗的机理,提出了不同肥液浓度土壤间歇入渗量计算模型,建立了不同肥液浓度土壤间歇入渗参数与清水连续入渗参数的关系,实现了根据清水连续入渗资料与肥液浓度确定波涌灌溉肥液间歇入渗量。实例计算表明,该方法可简单而有效地确定土壤间歇入渗量。Coupling characteristics of soil water and nitrogen under intermittent infiltration with different fertilization concentrations were analyzed to study the effect of fertilization concentration on intermittent infiltration characteristics under surge fertigation. The results indicate that intermittent infiltration and infiltration rate increase with the increase of the fertilizer concentration at the same infiltration time, and it is obvious at the first period and is slow with the increase of periods gradually. The mechanism that intermittent infiltration increased with fertilizer concentration was analyzed. The intermittent infiltration model based on simplified Philip infiltration equation was suggested, and the relationships between intermittent infiltration parameters for different fertilizer concentrations and pure water continuous infiltration parameters were established, which could calculate intermittent infiltration under surge fertigation with continuous infiltration data and fertilizer concentrations. The example indicates that the method is simple and in effecte.

关 键 词：肥液浓度 波涌灌溉 间歇入渗 连续入渗 

分 类 号：S275.8[农业科学—农业水土工程] S158[农业科学—农业工程]