摘要
湿润锋随灌施时间延长不断迁移,含水率分布曲线由比较陡直逐渐变为相对平缓;灌施氯化铵对土壤中原有硝态氮具有明显的淋洗作用,灌施时间越长,淋洗深度越大,浓度峰迁移距离越大,浓度峰值越大;不同灌施时间,铵离子主要吸附在表层,表现出土壤对铵离子有截留作用,当灌施时间足够长后,多余的铵离子再向下运移,表现为铵离子在土壤中以"活塞"方式运移,铵离子随水分运移存在显著的滞后作用。
Wetting front moved with time and the curve of water ration gradually changed to be gentle;ammonium chloride infiltration had leaching effect on saltpeter ion,the leaching depth and distance and the value of concentration front increased with time.Ammonium ion was mainly adsorbed by the upper soil and soil had hole back effect on ammonium ion.The surplus ammonium ion moved down on the way of piston and solute transport was significantly delayed compared the water transport.These research had laid a foundation for further study that the crop absorb and assimilate the water and fertile in the film hole surface-fertile infiltration.
出处
《灌溉排水学报》
CSCD
北大核心
2009年第6期112-114,共3页
Journal of Irrigation and Drainage
基金
河北省教育厅科学研究计划项目(2008111)
国家自然科学基金项目(50579064
50179030)
关键词
膜孔灌
灌施
土壤氮素
迁移
分布
film hole infiltration
irrigation with fertilizer
soil nitrogen
transport
distribution
