氮素形态对烟苗根系生长及碳、氮积累的影响  

Effect of Nitrogen form on Root Growth and C and N Accumulation of Flue-cured Tobacco Seedlings

作　　者：邢瑶[1] 孙泽东[1] 陈乐[2] 马兴华[1] 张本强[3] 郑成鹏 

机构地区：[1]中国农业科学院烟草研究所农业部烟草生物学与加工重点实验室,青岛266101 [2]云南省烟草公司红河州公司,云南红河652399 [3]山东中烟工业有限责任公司,济南250014 [4]山东临沂烟草有限公司,山东临沂276000

出　　处：《中国烟草科学》2015年第5期13-18,共6页Chinese Tobacco Science

基　　金：公益性行业(农业)科研专项经费"烟草增香减害关键技术研究与示范"(201203091);中国烟草总公司特色优质烟叶开发重大专项"低危害烟叶研究开发"(110201101006 ts-06)

摘　　要：为探讨烤烟幼苗生长、根系发育及碳氮积累对不同氮素形态的响应,选用烤烟品种NC55,在水培条件下设置相同氮浓度的全铵(NH4+:NO3-=100:0)、铵硝各半(NH4+:NO3-=50:50)和全硝(NH4+:NO3-=0:100)3个处理,测定不同处理的干物质积累、根系形态、烟株碳氮含量及碳氮积累量。结果表明,地上部分生物量和总生物量在不同处理时间均表现为全硝处理>铵硝各半处理>全铵处理。处理后7 d和14 d,根系生物量、总长度、总体积、总表面积以及各器官的碳、氮积累量和总氮积累量表现为全硝处理>铵硝各半处理>全铵处理;处理后21 d,上述指标表现为铵硝各半处理>全硝处理>全铵处理。铵态氮肥作为单一氮源抑制了烤烟生长,硝态氮肥有利于地上部生长和碳积累,但长时间作为单一氮源根系生长缓慢,铵硝混合态氮素更有利于根系的生长发育和碳氮积累。In order to investigate the response of root growth, C and N accumulation of flue-cured tobacco seedlings to different nitrogen forms, hydroponic experiments were conducted by supplying equal amount of N in three different ratios of NH4+:NO3-(100:0, as 100-0AN; 50:50, as 50-50AN; 0:100, as 0-100AN) to seedlings of flue-cured tobacco cultivar NC55. Plant dry biomass, root morphology, C and N content, C and N accumulation were assayed during the cultivation. The results showed that shoot and total biomass showed 0-100AN>50-50AN>100-0AN at all treating times. On 7 and 14 d, root biomass, root total length, root total volume, root total surface area, C and N accumulation of root, stem, leaf and total nitrogen accumulation showed 0-100AN>50-50AN>100-0AN. On 21 d, the same parameters showed 50-50AN>0-100AN>100-0AN. Ammonium as sole nitrogen source inhibited flue-cured tobacco growth. Nitrate is beneficial to shoot growth and carbon accumulation, it however inhibits root growth as sole nitrogen source for prolonged time. Optimum nitrogen form for root development, C and N accumulation is the mixture of ammonium and nitrate.

关 键 词：烤烟 氮素形态 根系形态 碳积累量 氮积累量 

分 类 号：S572[农业科学—烟草工业]