大量研究证明土壤微生物在外来植物入侵过程中发挥着重要的调控作用。丛枝菌根真菌作为土壤中一类重要的共生微生物，其侵染率在很多植物入侵过程中显著增加，并由此增强了植物的竞争力。根系分泌物作为植物与土壤生物互作的重要桥梁，对环境变化特别敏感，对丛枝菌根真菌与植物的共生关系具有很强调控作用，但具体机制鲜有报道。本项目将以原产我国，现入侵美国的乌桕为研究对象，通过同质园试验，研究根系分泌物对不同昆虫群落变化的响应，以及这些响应对丛枝菌根真菌与植物共生的影响；并利用代谢组学分析技术，明确根系分泌物中，调控丛枝菌根真菌与植物共生关系的有效活性物质；同时开展验证实验，明确入侵植物的菌根真菌侵染率增加和环境变化增强植物入侵能力的根本原因。研究结果将对明确根系分泌物对丛枝菌根真菌与植物共生能力的调控机制具有重要的推进作用，为更深入的认识植物入侵机制和制定入侵植物防控策略提供理论依据。

Many researches indicated that soil microbe play critical role in regulating the plant invasion. Arbuscular mycorrhizal fungi (AMF), as an important mutualist, their colonization will be increased in plant invasion which will enhance the competitive ability of the invasive plant. Root exudate, as an important link between plant and soil biota, play critical role in the interaction between AMF and plants, but its mechanism is less reported. In this research, Chinese tallow tree, which is native to China but now invasive in the USA, is used as a target plan. We examine the response of root exudate to different insect population and the effect of these responses on interaction between AMF and invasive plant by common garden experiment. And then, make clear that chemical component in root exudate, which control the interaction between AMF and plant. Furthermore, make clear the reason why the AMF colonization in invasive plant become stronger and how does the environmental change enhance the competitive ability of invasive plants by test experiment. These results will help to understand the mechanism of root exudate on enhancing the plant invasive because of the AMF increasing, and it will provide new insight to carry pest control operation.