兰州盆地早第三纪植物及古气候意义.pdf

植 物 分 类 学 报 　39 (2) :105～115 (2001) Acta Phytotaxonomica Sinica 兰州盆地早第三纪植物及古气候意义 1 1 2 耿 宝 印　　 陶 君 容 　　 颉 光 普 1 ( ) 2 ( ) 中国科学院植物研究所 　北京 100093 　　 甘肃省博物馆 　兰州 730050 Early Tertiary fossil plants and paleoclimate of Lanzhou Basin 1 1 2 GEN G BaoYin 　　 TA0 JunRong 　　 XIE GuangPu 1 ( Institute of B otany , the Chinese Academy of Sciences , Beij ing 100093) 2 ( Museum of Gansu Province , Lanzhou 730050) Abstract 　Fossil plants from the lower part of Xianshuihe Formation in the Lanzhou Basin , Gansu Province were studied . The flora contains 29 species , representing 20 genera and 12 families , which include Lauraceae ( Dap hnogene) , Lardizabalaceae (A kebia) , Berberidaceae ( B erberis) , Ulmaceae ( Planera , Ulmus , Zelkova) , Betulaceae ( A lnus , Carp inus ) , Myricaceae ( My rica) , Salicaceae ( Pop ulus , S alix ) , Myrsinaceae ( A rdisia ) , Rosaceae ( Prunus , Sorbus , Sorbaria , Sp iraea ) , Leguminosae ( Gleditsia , Sop hora) , Anacardiaceae ( Rhus) , Caprifoliaceae ( Viburnum) . An anal ysis of the floristic elements and their foliar physiognomy shows that most members of the flora are deciduous broadleaved trees or shrubs with a few evergreen shrubs. The most noteworthy species is Rhus turcomanica which was present in the Middle Eocene to Late Eocene of Central Asia ( Kaza khstan , Turkme