摘要
采用三种类型土壤,通过静水释放试验和模拟降雨试验方法,研究了树脂包膜控释尿素对土壤氮素流失的控制效应。研究结果表明,树脂包膜控释尿素具有良好的控制释放性能;在历次模拟降雨过程中,褐土、棕壤和红壤的平均产流强度均呈现出先上升后稳定平缓的趋势;树脂包膜控释尿素的控释性能有效推迟了土壤径流硝态氮和铵态氮流失高峰的出现;与普通尿素相比,施用树脂包膜控释尿素降低了土壤径流硝态氮和铵态氮以及总氮流失量的23.9%～30.4%,20.6%～30.8%,3.7%～7.9%,进一步证实了树脂包膜控释尿素的推广施用能够控制土壤氮素流失,是防治农业面源污染的有效措施之一。
Controlling effects of controlled release urea coated by polymer on N losses in three soil types were researched by the hydrostatic release and simulated rainfall experiments.The results show that controlled release urea coated by polymer has great controlled release ability;the trend of average soil runoff intensity in the cinnamon soil,brown soil and red soil is on the rise at initial stage,subsequently is steady and smooth.The controlled release urea coated by polymer can postpone the peak of loss of NH＋4-N,NO-3-N in soil runoff.The controlled release urea coated by Polymer has the ability to control the loss of N in soil.Compared to common urea,the loss of NH＋4-N,NO-3-N and total N of soil can be decreased by 23.9%～30.4%,20.6%～30.8%,3.7%～7.9% respectively,which further confirms that the extend and utilization of the controlled release urea coated by polymer is one of effective measures to prevent agricultural non-point source pollution.
出处
《水土保持学报》
CSCD
北大核心
2010年第3期9-12,55,共5页
Journal of Soil and Water Conservation
基金
中央级公益性科研院所基本科研业务专项(国57002)
山东省优秀中青年科学家科研奖励基金(2007BS08016)
山东农业大学青年科技创新基金(23455)
关键词
模拟降雨
树脂包膜控释尿素
土壤氮素流失
控制效应
simulating rainfall
controlled release urea coated by polymer
nitrogen loss of soil
effects of control
