甘肃窑街侏罗纪真蕨植物化石微细构造

甘肃窑街是西北地区侏罗系窑街组的标准剖面地点，该含煤盆地植物化石丰富，且保存完好。本项目拟以古生物学和植物解剖学、化石植物生态学实验的学术思想为指导，采用光学显微、扫描和透射电镜及超薄切片等方法和手段，对窑街盆地侏罗纪典型真蕨植物的繁殖器官解剖构造进行深入细致的研究，分析其孢子囊群、囊群盖、孢子囊微细构造以及原位孢子的微观形态和超微结构特征，并与现代类型的真蕨植物进行比较；在此基础上探讨主要真蕨植物类群的系统分类和发育演化，进而揭示窑街盆地侏罗纪真蕨植物在属、种、科等级别上的多样性演变规律；尝试提取窑街中侏罗世蚌壳蕨科植物化石的角质层，探索其角质层特征与古气候、古环境演化之间的耦合关系，为今后利用蕨类植物化石角质层恢复古气候和古环境提供一个新的研究思路。最后，论证窑街盆地侏罗纪成煤环境，为甘肃以及西北地区含煤盆地的聚煤模式提供古植物学方面的证据。

The Yaojie coal-bearing Basin in Gansu Province has a standard geological section of Jurassic Yaojie Formation in Northwest China, in which plenty of plant fossils are well preserved. For this project, based on the palaeontology, phytotomy, and palaeoecology, we would like to make intensive research on reproductive organs' anatomical structure of classic Filicophyta fossil plants in the Jurassic Yaojie Basin with the experimental analysis of light microscope, scanning electron microscope (SEM), transmission electron microscope (TEM) and ultrathinsectioning.Our study will focus on the reproductive organs' micro-structure of sporangia, sporangium, indusium and ultrastructure of spore in situ; and compare with the extant Filicophyta in order to discuss the phyletic classification and development evolution of main Filicophyta plant groups. And then we can conclude the Jurassic Filicophyta diversity evolution rule on different levels such as species, genus and family in Yaojie Basin. We will try to get the Dicksoniaceae cuticle of the Middle Jurassic in Yaojie, Gansu Province, and find the relationship between cuticle structure characteristics and palaeoclimate and palaeoenvironment, which could provide a new way of research thinking about using the Filicophyta fossil cuticle to reconstruct the palaeoclimate and palaeoenvironment. Finally, we could infer the coal-forming environment in the Jurassic of Yaojie Basin, and provide the palaeotology evidence for the Coal-accumulating model of coal-bearing basin in Gansu Province even Northwest of China.