入侵植物对本地生态系统三级营养关系的调控机制

入侵植物常形成单一优势种群，严重威胁本地的生物多样性和生态系统的结构和功能。入侵植物通过多种方式改变和影响入侵地的生物群落。入侵植物对于本地植物和植食性昆虫的影响也会传递到更高营养级。研究入侵植物对于不同营养级生物的影响以及其入侵对当地三级营养关系的调控机制，对于揭示植物入侵机制和准确评估入侵后效至关重要。项目申请者将从植物-植物关系，植物-昆虫关系，昆虫-天敌关系以及植物-昆虫-天敌三级营养关系等方面系统的研究外来入侵植物介入本地食物链的机制。我们将采用野外调查、生物测定、化学物质分析、昆虫行为学、挥发性信号物质采集分析等技术和方法从食物链的营养物质流动、化学防御物质级联和信号物质传递三个角度来解析外来入侵植物对不同营养级生物的调控机制。从多营养级互作的角度阐明植物入侵机制，评估外来植物的入侵后效。

Invasive plant species often form dense populations and thereby reduce the abundance and diversity of local plant species or alter plant community composition. As a consequence, plant invaders may considerably modify the habitat directly and indirectly. Such changes may in turn translate into alterations at higher trophic levels with consequences that may affect species interactions. Study about the effects of invasive plants on the interactions between tri-trophics in native ecosystem is vital to assess the impact of invasive plants on ecosystem. We will research the mehanism about the effects of invasive plants on native species including the native plants, herbivores, predators and parasites. The interactions between plant and plant, between plant and herbivore, between herbivore and predator will be studied. We will use field surveys, open field tests, bioassay, behaviour experiment, chemical analysis and collections and analysis of volatiles to reveal the effects of invasive plant on nutrient flow, chemical cascade and chemical communication in native food chain.