塔里木北缘晚二叠世外区植物入侵事件

塔里木北缘二叠纪植物可划分为Autunia-Conferta组合,CalliPteris-Comia—In-iopteris组合,Callipteris-Schizoneura组合。晚二叠世发生了准噶尔区安加拉植物入侵塔里木区事件。在我国北方这是一次普遍的植物事件。早二叠世在塔里木发育的欧美—华夏型植物绝灭。安加拉植物入侵的重要因素,除了陆表海闭合外,还有气候的变化。晚二叠世古特提斯洋暖流对塔里木已无直接影响,温带气候影响增加,同时气候转向干旱。大多数欧美—华夏型植物不能适应这样的气候条件,而温带气候对安加拉区植物是适宜的。因此如有干旱转向潮湿的间隙,就有安加拉植物的繁衍,并占领了欧美—华夏植物原来的生态空间。

INTRUSION OF EXOTIC PLANTS OF LATE PERMIAN INTO THE NORTHERN MARGIN OF TARIM

The permian plants in the northern margim are divided into Autunia ,Conferta assemblage,Callopteris -Comia - Iniopteris assemblage , and Callopteris Schizineura assemblage. The intrusion of Angara plants into Tarim block took place at late permian. It is an univeral event in Tarim basin at early Permian died out. The intrusion is mainlu caused by the closure of epicontinental seas and the changes of climate. The warm current of late Permian from paleo -Tethys has no direct dffect on Tarim flora, but results in a much drier weather. So the Angara plants will develop and occupy the ecologic spaces of Euramerica -Cathysian plants if weather get damp from dry, since most of the Euramerica-Cathysian plants donot adapt such weather while the Angara plants do.