控制平原湖区棉田暗管排水水位对氮素流失影响分析

Effects of Controlled Level of Pipe Drainage on Nitrogen Loss

选取控制水位为地下0、30、50、80、100 cm的5块棉花地,测定分析生育期内土壤和排水中氮素含量,探讨不同的地下水控制水位对土壤氮储量和径流中氮素排放量的影响。结果表明,5块棉花地雨后地下水水位与控制水位显著线性相关,单位面积土壤中氨态氮储量随控制水位的降低而减少,暗管径流中氨态氮排放量与暗管排水量有明显的线性正相关关系,硝态氮的排放量有随控制水位降低而增加的趋势。

This experiment,carried in five cotton fields with separately controlled water level of 0,30,50,80,100 cm underground,study the influence of different controlled level of groundwater on content of nitrogen in soil and emission of nitrogen in pipe runoff by measurating and analysing the content of nitrogen in soil and runoff during growth season.According to the correlation analysis of experimental data,the five cotton fields,in which groundwater level after rain and controlled water level showed remarkable positive linear dependence,had the trend that ammonia nitrogen storage of soil in unit area reduced as the controlled level lowered.Emission of ammonia nitrogen in pipe runoff and pipe water discharge showed remarkable positive linear dependence and the trend of emission of ammonium nitrogen rising as controlled level lowered.