不同沟灌方式下玉米根区矿物氮迁移动态研究  

Transfer of mineral nitrogen in maize root zone soil under different furrow irrigation modes

作　　者：刘小刚[1,2] 张富仓[2] 杨启良[1,2] 王金凤[2] 李志军[2] 

机构地区：[1]昆明理工大学现代农业工程学院,昆明650024 [2]西北农林科技大学旱区农业水土工程教育部重点实验室,杨凌712100

出　　处：《中国生态农业学报》2011年第3期540-547,共8页Chinese Journal of Eco-Agriculture

基　　金：国家自然科学基金项目(50579066;50879073;51009073);国家科技支撑计划项目(2007BAD88B10);云南省应用基础研究项目(2010ZC043;2010ZC042);昆明理工大学测试基金项目(2010295)资助

摘　　要：为探索交替隔沟灌溉下玉米根区矿物氮分布规律,通过遮雨棚内微区试验,研究了常规沟灌、交替隔沟灌和固定隔沟灌3种沟灌方式对玉米根区硝态氮、铵态氮迁移的影响。结果表明:交替隔沟灌溉根区硝态氮等值线和常规沟灌相似,沟内硝态氮含量基本沿垄的中心对称分布。固定隔沟灌溉的湿润沟内硝态氮含量小于干燥沟,施氮后非灌水沟硝态氮保持较高水平。收获时交替隔沟灌溉的根区硝态氮残留量比常规灌溉略高。与硝态氮分布相比,铵态氮在根区土壤中的含量很小,3种沟灌方式在沟和垄中的铵态氮含量没有明显差异。The objective of this study was to explore the distribution of mineral nitrogen in maize root zone soils under alternative furrow irrigation.To that end,micro-field rain-shield experiments were conducted to determine the effects of three different furrow irrigation modes [conventional furrow irrigation（CFI）,alternative furrow irrigation（AFI） and fixed furrow irrigation（FFI）] on NO3？-N and NH4＋-N transfer in maize root zone soils.Results showed that NO3？-N content in AFI root zone soils was similar to that in CFI.Also NO3？-N in furrow profile occurred along centre line ridge symmetry.Under FFI,NO3？-N content in wet furrow was less than that in dry furrow.The content in dry furrow steadily increased after fertilization.At harvest,NO3？-N residue in AFI was slightly higher than that in CFI.Compared with NO3？-N,NH4＋-N content was very little.There was no significant difference in furrow and ridge in terms of NO3？-N and NH4＋-N content.

关 键 词：遮雨棚微区试验 交替隔沟灌溉 硝态氮 铵态氮 迁移 根区土壤 玉米 

分 类 号：S275.3[农业科学—农业水土工程]