贵州盘县晚二叠世宣威组鳞木茎的研究

发布时间：2018-05-31 15:19

本文选题：贵州盘县 + 晚二叠世　；参考：《云南大学》2015年硕士论文

【摘要】：鳞木类植物是一类乔木状的石松植物,最早可追溯到中泥盆世末,石炭纪时达极盛,二叠纪末绝灭。鳞木类是石炭二叠纪沼泽森林中的主要成员和主要成煤植物之一。本文利用醋酸纤维膜揭膜技术,详细研究了产自贵州盘县火铺煤矿晚二叠世宣威组的一种具有解剖构造的鳞木类植物茎干化石,建立了一个新属：两瓣木属Lobatodendron gen. nov.和一个新种：贵州两瓣木Lobatodendron guizhouense gen. et sp. nov.,同时,对其一些重要特征的分类和系统演化意义进行了探讨。贵州两瓣木是一种高大的乔木状植物,最重要的特征是其初生木质部分裂为相等的两瓣。此外,还具有封印木类和奇木类植物的混合特征：初生木质部外缘形成明显的波谷和脊状突起、叶迹由波谷中伸出、周皮中有分泌细胞与其他细胞交替形成的条带,这些都与封印木类植物特征相符；而髓为混合髓则是奇木类植物独有的特征。贵州两瓣木所具有的这些混合特征可能自时代较早的奇木类或封印木类长期演化而形成。本论文是首次对我国西南地区晚二叠世保存完整的鳞木类植物茎干进行详细的研究,使我们对晚二叠世鳞木类植物的解剖构造和分类多样性有了进一步的认识,对揭示鳞木类植物的系统发育和晚期演化具有重要的意义。
[Abstract]:Scaly wood is a kind of Arbor pine, which dates back to the end of the Middle Devonian. It was very abundant in the Carboniferous and extinct at the end of Permian. Carboniferous is a major member of the Permian marsh forest and one of the main coal-forming plants. In this paper, by using cellulose acetate membrane uncovering technique, a new genus, Lobatodendron gen. nov., has been established by studying the stem fossils of scaly wood plants produced in the late Permian Xuanwei formation of Huopu Coal Mine, Panxian, Guizhou Province. And a new species, Lobatodendron guizhouense gen. et sp. nov., from Guizhou Province. At the same time, the taxonomy and phylogenetic significance of some important characteristics of Lobatodendron guizhouense gen. et sp. Nov. The most important feature of two trees in Guizhou is that their primary xylem splits into two equal ones. In addition, it has the mixed characteristics of herbivore and oddwood: the outer edge of primary xylem forms obvious troughs and ridges, leaf traces protrude from the troughs, and bands of secretory cells and other cells are formed alternately in the pericarp. These are consistent with the characteristics of herbaceous wood plants, while the mixed pulp is unique to oddwood plants. The mixed characteristics of the two trees in Guizhou may be formed from the long-term evolution of the oddwood or seal wood in earlier times. This paper is the first time to study in detail the stem of the scales of the late Permian in Southwest China, which makes us have a further understanding of the anatomical structure and taxonomic diversity of the late Permian. It is of great significance to reveal the phylogeny and late evolution of squamous wood plants.
【学位授予单位】：云南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：Q914

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