稻田土壤中氮素运移转化规律的试验研究  

Experiment Study of the Nitrogen Transportation and Transformation Regularity in the Rice Field of Yinnan Irrigation District

作　　者：尹娟[1] 王南江[2] 勉韶平 

机构地区：[1]宁夏大学土木与水利工程学院,宁夏银川750021 [2]西安理工大学,陕西西安710048 [3]银川第一市镇有限责任公司,宁夏银川750012

出　　处：《灌溉排水学报》2005年第3期5-7,26,共4页Journal of Irrigation and Drainage

基　　金：宁夏回族自治区教育厅基金资助项目(宁教02003)

摘　　要：通过大田试验,对宁夏银南灌区稻田土壤中氮素运移进行了研究,以探讨在不同排水条件下,稻田中氮素的迁移、转化规律。研究结果表明:水稻田中氮素淋失的基本形态为NO3--N和NH4+-N,在下渗水流的驱动下,NO3--N的下移深度明显大于NH4+-N;不同排水处理中,土壤剖面NH4+-N浓度呈现随深度增加逐渐降低的趋势,NO3--N浓度在地面以下100cm内随深度增加逐渐升高,超过100cm之后逐渐降低;每次施肥后,不同处理的排水中NO3--N和NH4+-N浓度均表现为短期内迅速上升,后期逐渐下降的趋势;氮素的淋失主要发生在6月9日(拔节期)以前,在此期间,应加强水肥管理,以减少氮素淋失。A nitrogen transportation experiment was done in Yinnan irrigation district .Based on this experiment,this paper tried to find out the nitrogen transportation and transformation regularity in rice field under different drainage treatment .The results show that the basic form of nitrogen leaching was NO_3~——N and NH_4^+-Nin rice field. Driven by the leached water flow,NO_3~——N and NH_4^+-N can be transferred into the ground at a certain depth,but NO_3~——N transferring depth is bigger than NH_4^+-N.The concentration of NH_4^+-N in different treatment soil profile has a tendency to decrease with the depth. The concentration of NO_3~——N has a tendency to increase with the depth at range of 100 cm,then decreased gradually. Nitrogen leaching occurs mainly before June 9 in same year,during this time,we should enforce water fertilize management in order to reduce nitrogen loss.

关 键 词：稻田 氮素淋失 控制排水 氮肥运移转化 

分 类 号：S158[农业科学—土壤学]