外来植物是指在一个特定地域的生态系统中，不是本地自然发生和进化而来，而是后来通过不同的途径从其他地区传播过来的植物。外来植物如果能够在自然状态下获得生长和繁殖，就构成了外来植物的入侵。
运用野外调查和文献研究方法，对内蒙古自治区境内分布的外来入侵植物进行了初步研究。
Invasive plants in Inner Mongolia were recorded in this paper based on field survey and related materials.
外来入侵物种中热带来源与温带来源比例相当，人为引入导致的外来入侵植物高达39%。
The proportion of alien invasive species originating from the tropic zone was close to that from temperate regions. The proportion of alien invasive plants caused by intentional introduction was 39%.
各省外来入侵植物物种密度由东南海岸向内陆递减，造成这一趋势的主要影响因素为交通密度；
The density of invasive plant species declined from the southeast coast inland to the northwest, which was best explained by transport density.
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