摘要
该文通过室内入渗试验,研究了不同浓度的单膜孔肥液入渗NO3--N的分布特性。研究表明:不同浓度的膜孔肥液入渗土壤NO3--N浓度的湿润锋运移距离与土壤水分运动的湿润锋一致;肥液浓度越大,相同入渗时间的NO3--N浓度锋运移距离越大,土壤剖面NO3--N浓度最大值越大,相同深度处土壤NO3--N浓度也越大。肥液入渗土壤NO3--N浓度分布特征与湿润体深度符合分段函数模型。供水入渗过程中,NO3--N浓度锋运移距离和浓度最大值均随时间的延长而增大;再分布过程中,NO3--N浓度锋运移距离继续增大,而NO3--N浓度最大值逐渐减小。
Based on indoor experiment, NO3^--N concentration distribution characteristics under single point source infiltration with different fertilizer solution concentrations were studied. The wetting front distance of NO3^--N concentration under film hole infiltration has the same pattern as the movement of soil wetting front. The concentration front distance of NO3^--N and the maximum value of NO3^--N concentration in soil profile increase with the increase of the solution concentration at the same time. The NO3^--N concentration increases with the increase of the solution concentration at the same depth. The NO3^--N concentration distribution characteristics and wetting frong depth under fertilizer solution infiltration satisfy the subsection function model. The concentration front distance of NO3^--N and the maximum value of NO3^--N concentration increase with the increase of the time in the process of water supply. The concentration front distance of NO3^--N increases with the increase of the time in the process of redistribution and the maximum value of NO3^--N concentration decreases.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2006年第5期204-206,共3页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家自然科学基金项目(50579064
50179030)
陕西省高校省级重点实验室重点科研项目(03JS041)
西北农林科技大学旱区农业水土工程教育部重点实验室基金项目
关键词
膜孔灌
点源入渗
肥液浓度
NO3^--N浓度分布
film hole irrigation
point source infiltration
fertilizer solution concentration
NO3^--N concentration distribution