Distribution pattern of Eupatorium adenophorum varies with light level along roads in the middle area of Yunnan

To study the differences of distribution pattern of Eupatorium adenophorum varies with three light level along roads,13 sites in different light level were selected along 4 roads(Among them there were two high-grade roads and two low-grade roads respectively)in the middle area of Yunnan,which was the invaded area of Eupatorium adenophorum.The following results were obtained:light level had a very significant effect on distribution pattern of Eupatorium adenophorum along roads(p 0.001);Eupatorium adenophorum might invade more seriously and farther in areas that had high light levels than those had medium or low light level.Plant communities adjacent to high-grade roads might be more invaded by Eupatorium adenophorum than those adjacent to low-grade roads.