四种藤茎维管组织的分布  

DISTRIBUTION OF VASCULAR TISSUE IN FOUR RATTAN CANES

作　　者：蔡则谟[1] 

机构地区：[1]中国林业科学研究院热带林业研究所,广州510520

出　　处：《Acta Botanica Sinica》1989年第8期569-575,共7页Acta Botanica Sinica（植物学报：英文版）

基　　金：加拿大国际发展研究中心资助课题

摘　　要：本文分析了四种藤茎的节间维管组织分布。维管束密度在茎外层较内层的大;在茎的不同高度及内部诸层次均差异小直至相等。纤维比量自外层向内及自基部向上均表现减少的趋势。维管束大小及后生木质部导管直径自外层向内呈增大的趋势;在高度上有明显差异,但仅黄藤(Daemonorops margaritae(Hance)Becc.)和越南白藤(Calamus tetradactylus Hance)的后生木质部导管直径表现自基部向上增大,其余的变化不规则。文章讨论了纤维比量分布的实用意义。Vascular bundle density,fibre proportion,size of vascular bundle and diameter of meta- xylem vessel in canes of four rattans,i.e.Daemonorops margaritae,Calamus simplicifolius, C.tetradactylus and C.dioicus,were measured in relation to their radial positions of cross section and different cane heights.The radial and vertical distributions were expressed by 1×1 mm of unit,denominated 'a layer',from the bark to centre and by the number of nodes from the base to top respectively.All the measurements were done with a micro-projector. Distribution of radial direction.At all cane heights,a distinct or even abrupt change in the measured characteristics occurs between the peripheral two layers.From this zone towards the centre,the vascular bundle density shows approximately the same in all inner layers;the fibre proportion demonstrates a decreasing tendency;the size of vascular bundle and the dia- meter of metaxylem vessel reveal an increasing trend at different degree,Distribution of ver- tical direction.The vascular bundle density in the various layers shows a little or even no dif- ference between different heights.The fibre proportion in the outermost layer exhibits a de- creasing tendency from the base to top,and in inner layers some of them still have more or less the similar tendency.There are obvious differences,but no any pattern of variation, between the different heights in relation to both size of vascular bundle and diameter of metaxylem vessel in all the layers,except that the later in C.dioicus and D.margartae shows an increasing trend from the base to top.In addition,the practical significance of the dis- tribution of fibre proportion was discussed.

关 键 词：藤茎 维管组织 

分 类 号：Q944.55[生物学—植物学]