| 麦秆皮层矿质元素的微区分布 |
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| 引用本文： | 邱玉桂,云娜,蒋李萍.麦秆皮层矿质元素的微区分布[J].中国造纸学报,2003,18(2):6-10. |
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| 作者姓名： | 邱玉桂 云娜 蒋李萍 |
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| 作者单位： | 华南理工大学制浆造纸工程国家重点实验室,广州,510640 |
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| 基金项目： | 国家自然科学基金 ( 2 0 2 770 1 2 2 9876 0 1 2 )资助项目 |
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| 摘 要： | 用扫描电子显微镜-能谱仪(SEM—EDAX)研究麦秆节间皮层矿质元素的微区分布及Si等元素的电子地图。结果表明，节间外表面有2种形态，Si含量高达30％～60％。多数外表面呈高低相间的纵向平行条纹；这种皮层的外表面及皮层中Si的分布也呈高低相间的纵向平行条纹。少量外表面较粗糙，具粒状物且气孔器分布较多；粒状物是Si高度密集的部位；气孔器周围的Si密度明显提高，Si高度密集的气孔器壁深入到皮下纤维层中。麦秆皮层主要由C、O、Si、K等元素组成，并含有少量Cl、Ca、Al等元素。节间皮层中Si的含量呈规律性分布。与皮层相邻的纤维细胞壁中含Si量较高。Si是皮层生物结构中起决定作用的元素。麦秆不同部位的皮层中，C、O、Si等元素的含量及分布特点不同，预示着这些元素存在的化学状态的差异。
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| 关 键 词： | 麦秆 节间 矿质元素 分布 外表面 种皮 密集 粒状 皮层 EDAX |
| 文章编号： | 1000-6842(2003)02-0006-05 |
Distribution of Mineral Elements in Cuticle of Wheat Straw Stem |
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| Abstract: | The distribution and electron mapping of mineral elements in d if ferent parts of the internodes of wheat straw were studied by means of SEM-EDAX The results showed that there are two sorts of outer-surfaces of internodes, t h e major one is with longitudinally parallel stripes consisting mainly of the sil icon element, the other one is with many granules and stomas The density of si l icon element in granules and in the circle (i e the stomatic wall) of the sto ma is very high The cuticle consists of four major elements, i e C, O, Si and K, a few other elements, such as Cl, Ca, Al and so on The thickness of cuticle a n d the profile of mineral elements in cuticle in different parts of the internode s change regularly The content of silicon in fiber wall neighbored on the cut i cle is higher than that in fiber wall which is far apart the cuticle The silic o n plays a key role in the bio-structure of cuticle of wheat straw stem The ob vi ous difference between the contents and distribution of mineral elements in the cuticle of different parts of the internodes indicates the distinct differences between the chemical states of elements concerned |
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| Keywords: | wheat straw mineral element SEM-EDAX micro-area distribution chemical state of silicon |
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