摘要
以吉林省德惠市中层黑土上耕作定位试验小区为研究对象,探讨了免耕和秋翻两种耕作方式对土壤NO3--N在土体中分布的影响。6a的田间定位试验表明,免耕玉米小区NO3--N含量呈自上而下递减的趋势,表层和亚表层NO3--N含量均高于底层。秋翻玉米小区除2004年外,其他年份也表现出这种趋势。在试验的后两年,由于玉米根系和土壤动物的作用,免耕处理开始形成连贯的大孔隙,大豆小区免耕处理NO3--N有向土壤底土层富集的现象,免耕对土壤NO3--N淋失的影响已经开始显现。
The effects of no-tillage （NT） and fall plough （FP） on nitrate leaching in Black soil in Northeast China were studied in Dehni County,Jilin Province. The six-year＇ s research indicates that in the maize field, nitrate presented a decline from top to bottom, and nitrate in the surface and sub-surface soil layer is ~igher than that in the bottom soil layer. Similar results were obtained in the maize field under MP management except in 2004. In the＂ last two year＇ s study, NT formed coherent big pores due to maize roots and soil ani- mals, which resulted in nitrate accumulating in the bottom soil layer in soybean field under NT practice. The effect of NT management on nitrate leaching was going to appear.
出处
《农业系统科学与综合研究》
CSCD
2010年第3期344-348,共5页
System Sciemces and Comprehensive Studies In Agriculture
基金
国家自然科学基金项目(40801071)
吉林省科技发展计划项目(20050206-4)
国家科技支撑计划项目(2006BAD15B01)
关键词
黑土
免耕
秋翻
硝态氮淋失
black soil
no-tillage
fall plough
nitrate leaching
作者简介
时秀焕（1984-），女，在读博士，主要研究方向为土壤管理和土壤有机碳．
张晓平（1957-），男，研究员，主要从事土壤化学研究工作．
