| 程东娟,费良军,雷雁斌,尹娟.膜孔灌灌施条件下硝态氮迁移分布规律研究[J].干旱地区农业研究,2008,(1):237~240 |
| 膜孔灌灌施条件下硝态氮迁移分布规律研究 |
| Study on the rule of nitric nitrogen movement and distribution under film hole irrigation with fertilizer |
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| DOI：10.7606/j.issn.1000-7601.2008.01.44 |
| 中文关键词: 膜孔灌 灌施 硝态氮 迁移 分布 |
| 英文关键词:film hole irrigation irrigation with fertilizer nitric nitrogen movement nitric nitrogen distribution |
| 基金项目: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) |
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| 中文摘要: |
| 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17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。 |
| 英文摘要: |
| 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. |
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