连续施氮对半干旱地区春小麦水分利用效率的影响  

Effects of Continuous Nitrogen Application on Water Use Efficiency of Spring Wheat in Semi-arid Areas

作　　者：许爱霞 李玲玲 XU Aixia;LI Lingling(Gansu Provincial Key Laboratory of Arid Land Crop Science,Lanzhou Gansu 730070,China;Dingxi Supervision and Management Station for Agricultural Products Quality and Safety,Dingxi Gansu 743000,China)

机构地区：[1]甘肃省干旱生境作物学重点实验室,甘肃兰州730070 [2]定西市农产品质量安全监督管理站,甘肃定西743000

出　　处：《甘肃农业科技》2019年第4期56-59,共4页Gansu Agricultural Science and Technology

基　　金：国家自然科学基金(31460337;31660373;31761143004);甘肃省教育厅项目(2017C-12);"十二五"国家科技支撑计划(2012BAD14B03;2015BAD22B04-3)

摘　　要：通过田间试验,连续4 a研究了不同施氮量对春小麦水分利用效率的影响。结果表明,在黄土高原黄绵土土壤中,随施氮量的增加,春小麦水分利用效率呈先增后降的趋势,连续4 a施氮105 kg/hm^2时,春小麦的水分利用效率最高。春小麦产量与生育期降水量呈极显著线性相关水平,说明生育期降水极显著影响春小麦产量水平,并与降水年型有很大关系。Field trials were conducted to study the effects of different nitrogen application rates on water use efficiency of spring wheat for 4 consecutive years. The results showed that the water use efficiency of spring wheat increased first and then decreased with the increase of nitrogen application rate in loess soil of the Loess Plateau. The water use efficiency of crops was the highest when the nitrogen application rate was 105 kg/hm^2 for 4 consecutive years. The linear correlation between spring wheat yield and precipitation during growth period was very significant,which indicated that precipitation during growth period had a significant effect on yield of spring wheat and had a great relationship with precipitation pattern.

关 键 词：半干旱 春小麦 水分 利用效率 

分 类 号：S512.1[农业科学—作物学]