洪水对紫茎泽兰入侵繁殖的影响

Impact of Flood on Invasion of Eupatorium adenophorum

紫茎泽兰是我国危害最严重的外来入侵植物之一。对四川省宜宾市境内金沙江岸边一个极特殊的人工建筑内的紫茎泽兰进行了调查,发现调查区域内紫茎泽兰同时以有性和无性两种方式繁殖。紫茎泽兰植株的空间分布特征表明,风、人类活动、交通运输等在其他区域对紫茎泽兰入侵影响较大的因素,对该区域内的紫茎泽兰入侵无明显影响;种种迹象表明,洪水是该区域紫茎泽兰繁殖体最重要的来源,即洪水是紫茎泽兰入侵的重要促进因素。最后,根据金沙江流域水土流失严重和紫茎泽兰在该流域大面积分布的特点,探讨了洪水对紫茎泽兰扩散入侵的影响。

Eupatorium adenophorum is one of the most dangerous exotic invasion plants in China. But researches on the mechanisms underlying its invasion and spread are insufficient. The authors surveyed Eupatorium adenophorum in a special artificial construction at the side of Jinsha River in Yibin, Sichuan Province, China. Eupatorium adenophorum can propagate by weeds and asexual propagations. While the spatial distribution pattern suggests that wind, human activities, traffic, which impact the invasion of Eupatoriumadenophorum in other regions, have no distinct effect on the invasion of Eupatorium adenophorum in this construction. However the survey results show that it is floods that transport Eupatorium adenophorum here. And the effects of floods on the spread and invasion of Eupatorium adenophorum are discussed based on the characteristics of serious soil and water loss and widely spread of this plant in jinsha River.