丛枝菌根真菌(Arbuscular mycorrhizal fungi，AMF)广泛分布于草原生态系统，分类归属球囊霉门（Glomeromycota)；侵入植物根系形成丛枝菌根，影响寄主植物的养分吸收、生长发育及抗逆性，影响植物种间关系、植物群落演替与生态系统生产力。AM真菌的分布受寄主、土壤类型、气候环境各因素的影响，其多样性和功能被广泛关注，但分类、区系与生物地理分布的研究尚未深入。本项目拟以内蒙古地带性草原植被中最具典型性的针茅草原为对象，研究①群落AM真菌的物种多样性和遗传多样性；②不同针茅草原AM真菌种群、科属分布和生物地理分布特征；③AM真菌与土壤微生物的多样性以及土壤因子的相关性；④探索AM真菌区系、生物地理学研究的方法和理论。为阐述针茅草原植被发育与AM真菌的协同进化关系、以及AM真菌和寄主植物的资源保护和利用提供理论依据。

Arbuscular mycorrhizal fungi (Glomeromycota) colonize the roots of about majority of vascular plant species, and can increase uptake of some mineral nutrients, improve drought resistance, and provide pathogen protection of host plants. Different AMF communities induce different growth response in plants playing a potential role to determine ecosystem variability and productivity. The distribution of AMF were affected by the plant species, soil type, climate and other environmental factors. Much more studies are focus on the AMF diversity and its function, but the classification, mycobiota and biogeogrophy have not been research in the Mongolia steppe. In this study, the population, species and genetics diversity of AMF will be investigated in different Stipa steppes in Inner Mongolia area. The classification, conponent of community, genus and family, and biogeogrophic characteristic of AMF will be studied and analysised. The correlationship between the species and genetic diversity of AMF, with the soil microorganisms and soil factors will be calculated and analysized. The biogeographical distribution law of AM fungi will be investigated , and provide theoretical basis for understanding the principle of the co-evolutionary relationship between the AMF mycobiota with the host plant. This has important role for the protection and utilization of AM fungi and it host plants resource.