丛枝菌根真菌（简称，AM真菌）对维持陆地生态系统植物多样性和生产力、降低全球变化对生态系统的负效应具有重要意义。全球变化可以显著影响AM真菌群落组成和发育。尽管如此，全球变化背景下AM真菌对植物群落结构和组成的调节机制尚不清楚。本项目以松嫩草地为研究对象，采用野外模拟温度升高和氮沉降控制试验结合室内模拟试验，研究温度升高和氮沉降条件下AM真菌对松嫩草地植物群落结构和组成的调节机制，包括：AM真菌对植物功能性状、物候特征、繁殖特性、植物物种多样性和丰富度等影响情况，探明温度升高和氮沉降条件下AM真菌对植物群落结构的调节机制、以及AM真菌在维持植物群落物种丰富度和多样性方面的作用潜力。研究成果将为揭示草地生态系统地上（植物）-地下（AM真菌）相互作用适应全球变化的适应机理，评价未来全球变化背景下AM真菌在维持草地生态系统植物群落结构和组成方面的作用潜力提供理论依据。

Arbuscular mycorrhizal (AM) fungi is one of the most important soil microbiotas which play key roles in maintaining plant diversity and productivity in terrestrial ecosystem and alleviating the negative effects of global change on ecosystem stability. Meanwhile, the composition and development of AM fungi is often influenced by current global change. However, the feedback regulation of AM fungi on plant community structure and composition under global change condition are still not clear. This project will study the regulation of AM fungi on plant community structure and composition under warming and N addition conditions in Songnen meadow ecosystem, including functional traits, plant phenology, reproductive characteristics, species diversity, richness, etc. The results will elucidate the mechanism that AM fungi determine plant community structure and composition under global change. The results will help us to understand response of interaction between aboveground (plant community) and belowground (AM fungi) to global change in grassland ecosystem, evaluate the potential role of AM fungi on maintaining plant community structure and composition under global change condition in the future.