Arbuscular mycorrhizal (AM) fungal diversity was measured in three different natural mid-temperate steppe types: the meadow steppe, typical steppe, and desert steppe. In these steppe soils, 24 AM fungal species from eight genera were identified, in which Glomus had the highest relative abundance. Funneliformis geosporus, Glomus microaggregatum, and Septoglomus constrictum had high relative abundance and were found widely across varying soil depth and steppe type. Meadow steppes had significantly higher AM fungal species richness compared to typical steppes and desert steppes, but there was no significant difference between typical steppes and desert steppes. AM fungal spore density, two Bradford-reactive soil protein (BRSP) fractions, and extraradical hyphal length densities (HLDs) were significantly different among the three steppe types. Alkaline phosphatase and acid phosphatase activity, urease activity, and soil bacterial and actinomycotic quantity were significantly related to the AM fungal spore density and species richness in these arid and semi-arid steppes. Therefore, steppe types could influence the distribution pattern of AM fungal diversity and the content of glomalin-related soil protein (GRSP).

中文翻译：

---

内蒙古三种中温草原的AM真菌多样性及其影响

在三种不同的自然温带草原类型中测量了丛枝菌根（AM）真菌的多样性：草地草原，典型草原和沙漠草原。在这些草原土壤中，鉴定出了来自8个属的24 AM真菌物种，其中Glomus的相对丰度最高。Funneliformis geosporus，球囊microaggregatum和Septoglomus constrictum具有较高的相对丰度，并且在不同的土壤深度和草原类型中广泛发现。与典型草原和荒漠草原相比，草甸草原具有更高的AM真菌物种丰富度，但典型草原和沙漠草原之间没有显着差异。在三种草原类型之间，AM真菌的孢子密度，两个Bradford反应性土壤蛋白（BRSP）组分和自由基外菌丝长度密度（HLDs）显着不同。在这些干旱和半干旱草原中，碱性磷酸酶和酸性磷酸酶活性，脲酶活性以及土壤细菌和放线菌数量与AM真菌的孢子密度和物种丰富度显着相关。因此，草原类型可能会影响AM真菌多样性的分布模式和与gloomalin相关的土壤蛋白（GRSP）的含量。