【摘要】 内蒙古是我国生物多样性的关键地区之一。亚洲中部干旱区生态系统和生物类别最丰富、古老，地带性分异最复杂的地区。尤其西鄂多斯-东阿拉善，对欧亚干旱区植物区系的形成、保存以至繁衍都具有十分重要的意义。辽阔的草原生态系统是蒙古族等游牧民族及世界放牧畜牧业发源地之一。我区生物种类不算十分丰富，但区系来源复杂具有联系广泛，主体明显，特点突出，特有集中，效益巨大等特点。更多还原

【Abstract】 Inner Mongolia is one of the most important areas of our nation, it has the richest and oldest ecosystem and biological types, and the most complicated zone varieties of the arid region in central Asia. Specially, the west Ordus-east A LaShan region is very significant to form、preserve and breed the plant districts of the arid region in EuroAsia. The vast grassland ecosystem is one of the originial place of nomadic Mongolia nationality and developing animal husbandry in the world. The biological types in Inner Mongolia Autonomous Region is not quite richer than other province,but the sources of plant districts is complex,the main features are as below: extensive connection、obvious main part、prominent characteristic、centralized species、great benifities.更多还原