摘要
本文应用光镜及扫描电镜对生长在三种不同生境下的沙棘(Hippophac rhamnoides L.)次生木质部结构进行了解剖学研究,详细描述了其次生木质部结构的一般特征。以沙棘木质部的10个主要数量特征:早、晚材导管频率、单孔率、导管切向直径、导管分子长度,纤维长度,射线频率及高度等为指标,对生长在相同生境下和不同生境下的雌、雄株之间进行了比较。观察结果表明不同生境对沙棘木质部结构无显著影响,只在某些数量特征上有些影响。本文还初步探讨了降雨量与性别对沙棘木质部结构的影响。
This paper deals with an anatomical study of the secondary xylem of H.rhamoides from different habitats using light microscope(LM)and SEM.It gives a detail description of the general characteristics of the constitutions of the secondary xylem of the plant.By taking the ten major quantitative characteristics of the secondary xylem of H.rhamnoides—vessel frequ- encies of early wood and late wood,percentage of solitary vessels,tangential vessel diameter, vessel member length,fibre-tracheid length,ray frequency and ray height—as indicators. Male and female plants have been made a comparison under the same or different habitats. The results of observation showed that the change in habitat showed no effects on the structu- re of the secondary xylem of H.rhamnoides except that there were some effects on some quan- titative characteristics.This paper also makes a survey of the effects of rainfall and sex on thte structure of the secondary xylem of H.rhamnoides.
基金
中国科学院基金资助的课题
关键词
沙棘
生物环境
木质部解剖
Hippophae rhamnoides L.
Different habitats
Xylem anatomy
