广东省地质时期植物区系的形成与演变

广东现代植物区系的形成可以追溯到本区晚古生代华夏植物群的发展。早、中泥盆世,本区首先在一些海滨地带发育了裸蕨纲植物;晚泥盆世,广东植物区系大致反映了全球一致的拟鳞木植物群的性质;早石炭世具有前华夏植物群的色彩;二叠纪时已发展为典型的华夏植物区系的性质,是晚古生代华夏植物区系的重要组成部分。中生代,广东植物区系成分发生了很大的变化,裸子植物大量繁盛,但总体上是在本区晚古生代华夏植物区系的基础上演化而来的。晚古生代和中生代植物区系的发展为广东现代植物区系的形成奠定了基础。从第三纪开始,广东植物区系成分变得更加复杂多样,被子植物大量发展,取代了裸子植物占据统治地位。到了晚第三纪广东植物区系逐渐接近于现代。

The Origin and evolution of Guangdong flora in geological period

The formation of Guangdong modern flora can be traced back to the development of native late Paleozoic cathaysian flora.In Lower and Middle Devonian,the Psilophytopsida developed in some coastal area firstly;in Upper Devonian,Guangdong flora almost reflected the global characteristic of Lepidodendropsis flora;in Early Carboniferous it had some traits of Procathaysian Flora;in Permian,it had developed and formed a typical Cathaysian flora and was an important part of late Paleozoic Cathaysian flora.In Mesozoic,Guangdong flora had a big change,the gymnosperm was prosperous,but it was evolved from the late Paleozoic Cathay-sian flora as a whole.The development of late Paleozoic and Mesozoic flora laid a foundation for Guangdong modern flora.Guang-dong flora became more complex and multiplex from the beginning of Tertiary.The angiosperm developed in mass and dominated instead of gymnosperm.When it came to Late Tertiary,Guangdong flora was similar to the modern.