摘要
以4龄青牧1号老芒麦为试验材料,在返青期进行一次性开沟施肥处理,设置6个氮素(纯氮)梯度,梯度氮素施量分别为0、45、60、75、90、105 kg/hm^2。通过测定其在拔节期,开花期和成熟期根、茎、叶和穗部全碳、全氮含量,旨在明确不同氮素处理对老芒麦植株碳氮分配的影响。结果表明:青牧1号老芒麦茎,叶及穗部全碳含量在75 kg/hm^2处理下开花期最高,较同期对照分别提高了11.0%,12.1%和4.9%。根、穗部全氮含量在75 kg/hm^2处理下分别于拔节期和开花期达到最高,较同期对照提高了32.0%、16.3%,茎、叶部在105 kg/hm^2处理下分别于开花期和拔节期达到最高,较同期对照均提高了57.5%。
4-year-old Elymus sibiricus cv.Qingmu No.1 was used as materials.Six gradients of nitrogen(pure nitrogen)were set up in one-time ditching and fertilizing treatment during the green returning period.The gradients of nitrogen application were 0,45,60,75,90 and 105 kg/hm^2,respectively.By measuring the total carbon and nitrogen contents of roots,stems,leaves and spikes at jointing,flowering and mature stages,In order to define the effects of different nitrogen treatments on the carbon and nitrogen distribution of the Elymus sibiricus cv.The results showed that the total carbon content of stem,leaf and spike of Qingmu No.1 was the highest at 75 kg/hm^2,which was 11.0%,12.1%and 4.9%higher than that of the control.Under 75 kg/hm^2 treatment,the total nitrogen content of root and spike reached the highest level at jointing stage and flowering stage respectively,which was 32.0%and 16.3%higher than that of the control at the same period.Under 105 kg/hm^2 treatment,the total nitrogen content of stem and leaf reached the highest level at flowering stage and jointing stage respectively,which was 57.5%higher than that of the control at the same period.
作者
武蓓
何丽娟
罗瑞
林伟山
张万通
王勇
吴召林
金鑫
祁娟(甘肃农业大学草业学院
草业生态系统教育部重点实验室
甘肃省草业工程实验室
中-美草地
WU Bei;HE Li-juan;LUO Rui;LIN Wei-shan;ZHANG Wan-tong;WANG Yong;WU Zhao-lin;JIN Xin;QI Juan(College of Grassland Science,Gansu Agricultural University,Key Laboratory of Grassland Ecosystem,Ministry of Education,Grassland Engineering Laboratory,China-US Center for Grazing Land Ecosystem Sustainability,Lanzhou 730070,China)
出处
《草原与草坪》
CAS
CSCD
2019年第6期19-25,共7页
Grassland and Turf
基金
甘肃农业大学科研训练计划项目(20180233)
青海省科技厅重点实验室发展专项(2017-ZJ-Y12)
国家自然科学基金(31660684)资助
关键词
氮肥
老芒麦
碳氮比
营养分配
nitrogen fertilizer
Elymus sibiricus
carbon-nitrogen ratio
nutrient partitioning
