Diversity characteristics of arbuscular mycorrhizal fungi in the rhizosphere of twenty six species of plants in Songnen saline-alkaline grassland

In order to explore the diversity of arbuscular mycorrhizal(AM) fungi in the rhizosphere of salt-tolerant plants in Songnen saline-alkaline grassland, 26 species of plants of 11 families from Songnen saline-alkaline grassland were gathered and 40 AM fungal species of five genus were isolated in July 2013. Glomus and Acaulospora were the dominant genus and Glomus intraradices was the dominant species. Density of the spore in the rhizosphere of Potentilla flagellaris were 986.0 cfu·kg-1 soil, which was the highest one among the 26 plant species, while that of the lowest one was Polygonum aviculare, with 452.3 cfu·kg-1 soil. The diversity of AM fungal species in the rhizosphere of Taraxacum mongolicum was the richest, with the Shannon diversity index of 1.43. pH value had a significantly negative correlations with spore density and species richness (P<0.05), while soil organic and total nitrogen content correlated significantly positively with Shannon-Weiner (P<0.05), and had a highly significantly positive correlation with spore density and species richness (P<0.05). Total phosphorus content had a significant positive correlation with spore density, species richness and Shannon-Weiner (P<0.05).