蒙古高原鸦葱属植物区系地理分析

蒙古高原地处亚洲温带地区，共有鸦葱属植物11种，分属于6个区系分布类型，欧亚温带成分（1种）的存在与其蒙古高原所处地理位置在亚洲温带地区相一致，在蒙古高原的北部渗入西伯利亚成分（1种），在其东部和南部渗入东亚成分（2种），反映了该区植物区系与西伯利亚和东亚森林区植物区系的联系。黄土高原成分（1种）的出现同原植物区系与黄土高原植物区系的紧密联系。亚洲中部成分（5种）构成主体，特别是S.capito和S.grubovii为蒙古高原所特有，是该区植物在蒙古高原长期适应进化的结果，蒙古高原的雅葱属植物以旱生为主，多生于山区及沙地，其区系联系与华北最为紧密，其次是东北和东西伯利亚。

Analysis of floral ecological and geographical distribution of Scorzonera genus in the Mongolian plateau

The Mongolian plateau lies in the Asia temperate zone and 11 species of Scorzonera genus which appeared at Mongolian plateau belong to 6 floral component. Existing of Europ Asia temperate Zone element (1 sp.) consist with its geographical position of the Mongolian plateau which is situated in the temperate zone. The invasion of the Siberia element (1 sp.) at the northern part of Mongolian plateau and infiltration of East Asia element (2 sp.)at the east south of Mongolian plateau have reflected the connection of the floral of Scorzonera genus in the Mongolian plateau and the floral of Siberia and forest floral of East Asia. Appearance of Loess plateau element(1 sp.) shows the close relationship between the floral of Mongolian plateau and the floral of Loess plateau. The central Asia element (5 sp.) plays main part in the Mongolian plateau, of which, S.grubvoii and S.capito are the unique. Appearance of these species results from evolution and suitability for long term in the Mongolian plateau. Many species of Scorzonera genus belong to xerophyte, which mostly distributed in mountain and sand area. It has close relationship of floral northern China, north east China and East Siberia, respectively.