南京林业大学学报(自然科学版) ›› 2000, Vol. 24 ›› Issue (01): 45-50.doi: 10.3969/j.jssn.1000-2006.2000.01.012

• 研究论文 • 上一篇    下一篇

光皮桦和青冈栎茎的比较解剖

易咏梅   

  1. 湖北民族学院林学系;恩施445000
  • 出版日期:2000-02-18 发布日期:2000-02-18

Anatomical Observations on Stems of Seedlings of Shining leaf Birch and Blue Japanese Oak

YiYongmei   

  1. ForestryDepartmentofHubeiInstituteofNationalities Enshi 44 50 0 0
  • Online:2000-02-18 Published:2000-02-18

摘要: <正>光皮桦和青冈栎一年生苗茎的解剖比较表明 ,前者茎的构造更具有适应速生生长的特征 :茎上部的初生生长持续时间长 ;茎的输导组织较青冈栎发达 ;形成层细胞分裂次数多 ,分裂速度快 ,因而形成的次生木质部径向厚度大 ,而青冈栎茎中机械组织较发达 ,材质更坚硬。

Abstract: ThispaperdealswithMorphologicalanatomyofstemsofyearlingseedlingsofBetulaluminiferaHWin kl.andCyclobalanopsisglauca(Thunb.)Oerst.Thepreliminaryresultshowsthattheanatomicalfeaturesofstemof Betulaluminiferaadapttofastgrowing.ThreeimportantdifferencesofanatomybetweenBetulaluminiferaandCy clobalanopsisglaucaare:1)primarystructureoftheupperstemofNovember,resultinginthelongperiodandrapid speedofshootheightgrowth;2 )conductingtissueofBetulaluminiferaisadvancedanddispersesrandomly ,with greatnumberandlargediameter,leadingtohigherratetowaterandinogranicsaltconduction .Incontrastconducting tissueofCyclobalanopsisglauca ,accompaniedbyxylemraybundles,representsradioactiveshapewithsmallnumber anditsmechanicaltissueisadvancedwithgreatnumberandhighlymaturedpholemfiberandxylemfiber,which limitsthegrowthofitsshootheightandcollardiameter;3)radialthicknessofsecondaryxylemofBetulaluminifera is3 .2timesthatofCyclobalanopsisglauca,duetoitsactivecambiumfission .Thattherearemuchmorenon ligni factedcelllayersofBetulaluminiferaistheresultthatxylemcellsdonotlignificatasquicklyasactivesofcambium fissiondo .

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