中国桫椤科植物叶、孢子和孢子囊环带元素的X-射线微区成分分析  

X-ray microanalysis of the element of the leaf, spore and sporangium annulus Cyatheaceae plant in China

作　　者：周云龙[1] 李永良[2] 陈晓端[2] 常崇艳[2] 

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

出　　处：《广西植物》2003年第2期188-192,共5页Guihaia

基　　金：国家科委公关项目(97 B 14)

摘　　要：用扫描电镜和X ray微区分析方法测定和分析了中国产的13种及变种的桫椤科植物的叶、孢子和孢子囊环带中元素组成和平均质量分数。结果表明这13种及变种植物在叶、孢子和孢子囊环带的元素组成上彼此均有一定的差异;在元素的平均质量分数上,差异更加明显;同一植物的叶、孢子和孢子囊环带元素组成大多不完全相同,在叶中的元素种类均多于孢子和孢子囊环带的元素;并且同一植物的叶、孢子和孢子囊环带中元素的平均质量分数差异也较大;13种及变种植物叶、孢子和孢子囊环带元素的的平均质量分数最高的大多为K元素,而孢子中质量分数最高的为Si元素。13种及变种的桫椤科植物在元素组成和平均质量分数上的差异可能与其结构、生理和生态环境有关。The element composition and mass fraction of the leaf, spore and sporangium annulus of 13 species and their variant of Cyatheaceae were analyzed by SEM and Xray microanalysis. The results show that the element composition of the leaf, spore and sporangium annulus of these plants is different each other; the mass fraction is more evidently different. The element composition of the leaf, spore and sporangium annulus of same plants is unlike, and the sort of element in the leaf is more than in the spore and sporangium annulus. The mass fraction of the leaf, spore and sporangium annulus in the same plant is also different. K is the most in the leaf and sporangium annulus, and in the spore Si is the majority. The difference of element composition and mass fraction is connected with their structure, physiology and ecological environment. But the significance of element composition and mass fraction in Cyatheaceae classification haven't been discovered.

关 键 词：桫椤科植物 元素组成 X-ray微区分析 质量分数 

分 类 号：Q944[生物学—植物学]