白皮松针叶元素的X射线微区分析  

X RAY MICROANALYSIS OF THE ELEMENTAL COMPOSITION IN THE NEEDLE LEAVES OF P.BUNGEANA ZUCC. EX ENDL.

作　　者：杨蓉西[1] 王娟[1] 李永良[2] 周云龙[1] 

机构地区：[1]北京师范大学生命科学学院 [2]北京师范大学分析测试中心,北京100875

出　　处：《北京师范大学学报（自然科学版）》2003年第2期246-249,共4页Journal of Beijing Normal University(Natural Science)

基　　金：北京师范大学本科生科学研究基金资助项目

摘　　要：将白皮松 (P .bungeanaZucc .ExEndl.)一至四年生针叶分别从尖端、中部和基部截取小段 ,用扫描电镜X射线微区分析测定各段的表皮、下皮层、叶肉组织和维管组织的元素组成和平均质量分数 ( w) ,结果发现 ,针叶中不同年份 ,不同部位、不同微区的元素组成及其 w是有差异的 :一至四年生的白皮松针叶中可测得的元素种类分别为 10 ,8,9,11种 ;尖端、中部、基部的元素组成相同 ,但 w有差异 ,各段K ,Ca的 w都较高 ;分析各个微区 ,在表皮 ,Ca ,Si,P ,S的 w较高 ,下皮层中K的 w大幅度提高 ,Mg的 w在叶肉组织中有明显增加 ;在维管组织中 ,除K ,Ca外其他元素的 w均低于 10 % ,但Fe ,Cu的 w明显升高 .这些变化与各元素的生理作用有关 .研究结果对进一步探讨白皮松针叶的结构和生理特点有重要意义 .The elemental composition and average mass fraction in the needle of P.bungeana Zucc. Ex Endl are analysed by SEM X ray microanalysis method. The result showes that the elemental composition and average mass fraction in the needle vary with years,positions and microzones. In the needles of one to four years old, the kinds of element detecteded are 10,8,9,11,respectively. And in the tip,middle and base of the needle,though the element composition is the same, the average mass fracions of different elements are various, in which K and Ca are the highest in all of the three position. According to the microzone,Ca,Si,P and S are high in the surface layer; in the hypoderm,the content of K rises evidently;Mg increases obviously in the mesophycl tissue,and in the vascular tissue all of elemental average mass fractions are below 10% except K and Ca, where the relative content of Fe and Cu increases obviously. The differences above are related to the physiological function of different elements. The result is valuable in studing the structure and physiological characteristics of P.bungeana Zucc. Ex Endl.

关 键 词：白皮松 针叶 矿质元素 元素组成 元素种类 质量分数 X射线微区分析 生理作用 

分 类 号：S791.243[农业科学—林木遗传育种] Q946.91[农业科学—林学]