Diversity of arbuscular mycorrhizal fungi in Dahurian larch forests in Da Hinggan Ling Mountains

An investigation was made on the colonization and diversity of arbuscular mycorrhizal fungi(AMF)on the root systems of 26 plant species of 17 families in the Dahurian larch forests in Da Hinggan Ling Mountains.It was found that 23 of the 26 plant species could form arbuscular mycorrhizae(AM).The average colonization rate was 21.69%,ranging from 0 to 78.7%.Four plant species formed Paris-type AM,10 plant species formed Arum-type AM and 9 intermediate-type AM,and 3 species could not form AM.The 50 AMF species isolated from root zone soils belonged to five genera,among which,24 AMF species belonged to Acaulospora,19 belonged to Glomus,5 belonged to Entrophospora,1 belonged to Archaeospora,and 1 belonged to Gigaspora.Acaulospora and Glomus were the dominant genera,and A.nocolsonii and G.etunicatum were the dominant species.The average AMF spore density was 68.94 per 100 g air-dried soil,and the average species richness was 7.83 species per soil sample.No correlations were observed between the AM colonization rate and the spore density and species richness.