欢迎来到天天文库
浏览记录
ID:9074737
大小:640.49 KB
页数:8页
时间:2018-04-16
《铵硝配比对大豆生长及结瘤固氮的影响》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、中国油料作物学报2014,36(3):349-356ChineseJournalofOilCropSciencesdoi:10.7505/j.issn.1007-9084.2014.03.009铵硝配比对大豆生长及结瘤固氮的影响*李凯,郭宇琦,刘楚楠,陆星,廖红(华南农业大学资源环境学院,根系生物学研究中心,广东广州,510642)摘要:通过水培方法在5种不同铵硝配比下,研究不同氮形态及接种根瘤菌对大豆生长、结瘤固氮的影响及其生理机制。结果表明,不同铵硝配比对大豆植株生长、产量、生物固氮及氮效率等影
2、响显著,随硝氮比例增加,植株生物量、籽粒产量、结瘤固氮及氮效率等指标均呈现先增加后降低的趋势,以铵硝比25∶75处理效果最佳,总体表现为铵硝比25∶75≥0∶100>50∶50>75∶25>100∶0。较高铵硝比(≥50∶50)严重抑制了大豆根系的伸长生长、根瘤的形成及其固氮酶的活性,从而降低了生物固氮的贡献率,最终导致大豆产量及氮素效率的降低。接种根瘤菌显著增加大豆产量和籽粒含氮量,并与铵硝比之间存在协同效应。铵硝比为25∶75时接种根瘤菌,氮效率最高,最有利于大豆生长及籽粒产量的形成。研究结果对
3、优化大豆水培营养液配方以及指导农田生产中氮素合理施用均有较强的借鉴作用。关键词:大豆;铵硝配比;根瘤;生物固氮;氮效率中图分类号:S565.1文献标识码:A文章编号:1007-9084(2014)03-0349-08+-EffectsofdifferentNH4/NO3ratiosonsoybeangrowth,nodulationandbiologicalNfixation*LIKai,GUOYu-qi,LIUChu-nan,LUXing,LIAOHong(RootBiologyCenter,Co
4、llegeofResourceandEnvironmentScience,SouthChinaAgriculturalUniversity,Guangzhou510642,China)+Abstract:Soybean[Glycinemax(L.)Merr]weregrowninhydroponicsat5ammoniumtonitrate(NH4/-NO3)ratiostoinvestigatetheeffectsofdifferentnitrogen(N)formsandinoculationw
5、ithrhizobiaonsoybeangrowth,nodulationandbiologicalNfixation(BNF),aswellasitsunderlyingphysiologicalmechanisms.There-+-sultsshowedthatdifferentNH4/NO3ratiossignificantlyaffectedplantbiomass,yield,BNFandNefficiency.Plantbiomass,grainyield,indexofnodulati
6、onandNefficiencyincreasedtothemaximumvalueandthende--+-creasedwithincreasingNO3ratio.Amongalltreatments,NH4/NO325∶75performedthebestandtheeffects+-+-wereinthefollowingorder:NH4/NO325∶75≥0∶100>50∶50>75∶25>100∶0.HighNH4/NO3ratios(≥50∶50)notonlysuppressed
7、soybeangrowthbyinhibitingrootelongation,butalsosuppressednoduleformationandnitrogenaseactivity,andthusdecreasedthecontributionofBNF;therebyresultinginthereducedsoybeanyieldandNefficiency.InoculatedwithrhizobiasignificantlyincreasedsoybeanyieldandgrainN
8、content,showinga+-synergeticeffectamongNH4/NO3ratiosandinoculationwithrhizobia.SoybeanperformedbestonyieldandN+-efficiencywhengrowninaNH4/NO3ratiosof25∶75combinedwithrhizobiainoculation.OurstudyshedlightonoptimizationofNmanagementforsoy
此文档下载收益归作者所有