摘要
利用自行研制的膜孔点源入渗装置，测试膜孔灌灌施条件下硝态氮的迁移和分布规律。结果表明：在肥液连续入渗过程中，硝态氮浓度锋运移与水分湿润锋是一致的；随着距离膜孔中心距离的增加，NO3-N含量减小，在湿润锋位置处土壤NO3—N含量急剧减小到本底值；进入再分布过程后，土壤水分运移速度减慢，整个湿润土体内的含水量分布更加均匀；再分布1～7天内，硝态氮含量略有下降，再分布10天后，硝态氮反硝化作用增强，径向处的反硝化作用弱于垂向处，硝态氮含量明显降低。
Through experiment with self-made device for film hole infiltration, the rule of NO3 - N movement and distribution under film hole irrigation with fertilizer is studied. The results show： the NO3 - N concentration front movement consists with the water wet front movement in the course of water infiltration. The NO3 - N content decreases with the increasing of distance from film hole center. The NO3 - N content decreases abruptly to background value at the wet front; water moves slowly in the course of redistribution and water content distributes uniformly in the whole wet soil body. The NO3 - N content decreases in the early 1 -7 days of redistribution. Denitrification is more strongly in vertical indirection than in horizontal indirection and the NO3 - N content decreases distinctly. The research results has laid a foundation for further study of film hole irrigation.
出处
《干旱地区农业研究》
CSCD
北大核心
2008年第1期237-240,245,共5页
Agricultural Research in the Arid Areas
基金
国家自然科学基金项目(50579064,50179030)
陕西省高校重点实验室重点科研项目(30JS041)
关键词
膜孔灌
灌施
硝态氮
迁移
分布
film hole irrigation
irrigation with fertilizer
nitric nitrogen movement
nitric nitrogen distribution
