摘要
为研究暗管控制排水与非控制排水条件下,不同排水出口控制高度对土壤中氮素分布和迁移的影响,在湖北省荆州市四湖工程管理局丫角排灌试验站进行了野外试验。试验结果表明,无论采取控制排水与否,土壤垂直剖面上硝态氮浓度均有一致的变化规律：20 cm处浓度最高,在40-60 cm浓度急剧减小,60-80 cm浓度值很小（1 mg/kg左右）;控制排水对土壤硝态氮的减小率有显著影响,表现在控制水位越高,土层间硝态氮减小率最大;控制排水能降低表层土壤硝态氮的迁移;铵态氮与硝态氮迥然不同,无论采取控制排水与否,铵态氮在土壤垂直剖面上的含量变化不大;控制排水对铵态氮的含量也有一定的影响,表现在控制排水位越低,土壤中铵态氮的含量越小。
A field experimental project was carried out in Jingzhou City, Hubei Province to assess the effects of controlled drainage on the distribution and the content of nitrogen in the soil. The study has draw conclusions as following： 1 ）The controlled drainage system had a remarkable effect on the diminishing ratios of nitrate nitrogen between neighboring layers. It was presented that the diminishing ratio increased with the raising height of drain outlet. Controlled drainage system also reduced the transference of nitrate nitrogen in topsoil. 2）Different from nitrate nitrogen,the content of ammonium nitrogen was stable, the effect of controlled drainage system on it was not obvious,it was indicated that the content of ammonium nitrogen decreased according to the lowering of controlling height of drain outlet.
出处
《长江流域资源与环境》
CAS
CSSCI
CSCD
北大核心
2009年第11期1063-1066,共4页
Resources and Environment in the Yangtze Basin
基金
国家"十一五"科技支撑计划课题"灌区农田排水与再利用关键技术研究"(2006BAD11B06)
关键词
控制排水
硝态氮
铵态氮
排水出口控制高度
controlled drainage
nitrate nitrogen
ammonium nitrogen
controlling height of drain outlet
