Abstract:

There are 507 kinds of vascular plants which belong to 363 generals in 118 families in Lingyuan Mountains.The result shows that there are 43 species alien invasive plants among these plants(accounting for 8.48%),the 43 species come from 39 generals(10.47%) and the 39 generals are from16 families(13.56%).Among them,the highest proportion is the Asteraceae family.There are 16 species in the Asteraceae family,accounting for 37.19% of the total invasive species.The terrestrial herb which belongs to the life was the most abundant and there are 34 species(79.07%).The number of species from America was 32,which was the most,and accounted for 74.42% of the total species number.28 species(65.12%) were introduced unintentionally.According to the analysis of the survey of 41 forest communities in Lingyuan Mountains,Eupatorium catarium is the biggest invader and has caused great damage to the species of Lingyuan Mountains.In all kinds of the forest vegetation,there are the most alien invasive species in the Eucalyptus grandis × E.urophylla community.This article shows the damage of invasive species to the ecosystem of Lingyuan Mountains.And suggestions and preventions are raised to protect the ecosystem.

Key words: Lingyuan Mountains, alien invasive plant, control strategy, biological invasion