中文摘要：

外来植物与入侵地土壤丛枝菌根真菌（AMF）的互作和反馈已被认为是许多入侵植物的重要入侵机制之一。为进一步探究入侵植物紫茎泽兰（Ageratina adenophora）竞争替代本地植物过程中AMF的作用,本研究首先测定了林下和林地边缘两类生境中紫茎泽兰和本地植物的AMF侵染率和AMF含量,结果表明,2种生境中紫茎泽兰的菌根侵染率和AMF含量均显著高于本地植物,且菌根侵染率与AMF含量呈显著正相关。温室盆栽试验结果进一步表明,接种AMF显著促进了紫茎泽兰的生长,且对硝态氮和有效磷的吸收能力优于本地植物香茶菜（Rabdosia amethystoides）,同时降低了竞争中本地植物香茶菜的菌根依赖性,提高了紫茎泽兰对香茶菜的竞争优势度。本研究进一步证实AMF有利于促进紫茎泽兰的竞争性扩张。

英文摘要：

The interaction and feedback of exotic plants and arbuscular mycorrhizal fungi （AMF） have been considered as one of the important invasive mechanisms of many invasive plants. In or- der to explore the role of AMF in the competition of invasive plant, Ageratina adenophora over n- ative plants, this study investigated the root AMF colonization rate and AMF content in A. adeno- phora and native plants beneath forest and its edge area. The results showed that A. adenophora had significantly higher root AMF colonization rate and AMF content than the native plants, and the root AMF colonization rate showed a significant positive correlation with the AMF content. In a greenhouse experiment through adding AMF of A. adenophora to soil, AMF significantly promo- ted the growth of A. adenophora, whose abilities of absorption of nitrate nitrogen and available phosphorus were stronger than those of the native plant Rabdosia amethystoides. AMF also de- creased the mycorrhizal dependency of R. amethystoides, and enhanced the competitive advantage of A. adenophora over the native plant. Our results further indicate that AMF is conducive to the promotion of competitive expansion of A. adenophora.