| 摘要: |
| 为探讨不同排水条件下稻田中氮素的迁移、转化规律。通过大田试验，对宁夏银南灌区稻田土壤中氯素的淋失情况进行了研究。结果表明。排水量越大，NH+4-N下移深度越大；在下渗水流的驱动下，NO-3-N的下移深度明显大于NH+4-N；不同排水处理中，土壤剖面NH+4-N浓度呈现随深度增加逐渐降低的趋势，NO-3-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NO-3-N和NH+4-N浓度均表现出短期内迅速上升，以后又逐渐下降的趋势；氯素的淋失主要发生在拔节期以前，在此期间，应加强水肥管理，以减少氯素淋失。 |
| 关键词: 宁夏银南灌区 稻田 氮素淋失 控制排水 氮肥运移转化 |
| DOI： |
| 分类号:S143.12 S143.13 |
| 基金项目:宁夏回族自治区教育厅基金项目(02003)；国家自然科学基金项目（50579064，50179030） |
|
| Experiment on the nitrogen leaching in the drainage condition of rice field in Ningxia Yinnan irrigation region |
|
YIN Juan FEI Liang-jun MIAN Shao-ping
|
| Abstract: |
| A nitrogen transportation experiment was conducted in Yinnan irrigation district.Based on this experiment,this paper tried to find out the nitrogen transportation and tansformation law in rice field under different dranige treatment.The results show that the depth of NH+4-N transferring increases with the increase of drainage volume;Driven by the leached water flow,NO-3-N and NH+4-N can be tranfered into the ground at a certain depth,but NO-3-N is deeper than NH+4-N;The concentration of NH+4-N in different treatment soil profile tends to decrease with the depth;The concentration of NO-3-N tends to increase with the depth at rangea of 100 cm,then decreased gradually.Nitrogen leaching occurs maily before June 9 in the same year,during which,the management of water and fertilizing should be enforced in order to reduce nitrogen loss. |
| Key words: Ningxia Yinnan irrigation region rice field nitrogen leaching controlled drainage transportation and transformation of nitrogen |
