氮素添加对老龄中华羊茅人工草地草产量的影响  

The effects of nitrogen addition on biomass of aged Festuca sinensis Keng grassland in alpine region

作　　者：马兴贇 刘勇[2] 刘文辉[2] 魏小星[2] MA Xing - yun et al(Grassland Workstation of Haibei Prefecture, Haibei, 730070)

机构地区：[1]青海省海北州草原工作站,海北810299 [2]青藏高原优良牧草种质资源研究省级重点实验室,青海大学畜牧兽医科学院,西宁810016

出　　处：《青海畜牧兽医杂志》2017年第5期14-17,共4页Chinese Qinghai Journal of Animal and Veterinary Sciences

基　　金：青海省青藏高原优良牧草种质资源利用重点实验室(2017-ZJ-Y12);青海省科技厅科技合作专项“青海湖流域沙化土地综合治理技术集成与示范”(2016-HZ-822);“现代农业产业技术体系建设专项资金”(CARS-35-41)

摘　　要：采用中华羊茅3~5龄人工草地,设五个施肥水平处理,在高寒区开展氮素添加对老龄中华羊茅人工草地生物量分配影响的研究。结果表明,在4龄、5龄中华羊茅草地中,N素添加对草产量的影响均呈先增加后降低的趋势;在4龄中华羊茅草地中,N2处理干草产量为最高,达到3319.5kg/hm^2,在5a中华羊茅草地中,N3处理干草产量为最高达到2769.5kg/hm^2;在5龄中华羊茅草地,N素添加能够显著降低茎叶比。This study aims to understand how biomass allocation pattern of Festuca sinensis Keng grassland in alpine region response to the different nitrogen application level and to provide theoretical basis for rejuvenation of Festuca sinensis Keng grassland.in the third year,the fourth year and the fifth year of Festuca sinensis Keng grassland in alpine region was chosen and treated with different nitrogen application level including CK （no nitrogen application）,N1（contents urea 30 kg/hm^2）,N2（contents urea 45 kg/hm^2）,N1（contents urea 60 kg/hm^2）,N1（contents urea 75 kg/hm^2）.the results showed that for the fourth and fifth year Festuca sinensis Keng grassland,the biomass increased first and then decreased with the increasing nitrogen application level.For the fourth year grassland,the biomass was highest in N2 treatment,reached to 3319.5 kg/hm^2.For the fifth year grassland,the biomass was highest in N3 treatment,reached to 2769.5 kg/hm^2.For the fifth year grassland,dry matter content of Festuca sinensis Keng leaf was positively correlated to the nitrogen addition and nitrogen addition decreased the ratio of stem to leaf.

关 键 词：中华羊茅 氮素添加 生物量分配 茎叶比 

分 类 号：S506.1[农业科学—作物学]