The Effect of Sod-Culture on the Diversity of Arbuscular Mycorrhizal Fungi in the Rhizospheric Soil of Olive

Sod-culture can increase the arbuscular mycorrhizal fungi(AMF) infection of fruit trees, and AMF infection can promote the nutrient absorption of fruit trees. In order to provide theoretical support for the selection of herbage species with higher mycorrhizal infection rate in olive orchard, and to explore the influence of sod-culture on the AMF species diversity in the rhizosphere soil, the olive root system and rhizosphere soil was used as the research object in this study, with the olive seedlings cultivated in pots, and different grasses(including Paspalum notatum, Trifolium repens and Trifolium pratense) intercropped around the seedlings. The results showed that total of 19 species of AMF belonging to 4 genera in the rhizosphere in the four treatments being identified, Among them G. salsum and G. glomus were the dominant genera; Glomus claroideum, Glomus constrictum, Acaulospora foveata, Glomus clarum, Acaulospora delicate, Entrophospora infrequens were the dominant species. There were significant differences in the types and dominant species of AMF in different sod-culture treatments. The intercropped species of grasses had an important impact on the diversity of AMF, and the species diversity of AMF in the rhizosphere of the olive treated by intercropping bahia grass was higher than that of other treatments. Sod-culture promoted AMF infection of root system of olives and increased the spore density. The content of T-GRSP in the soil that intercropping bahia grass and white clover was significantly higher than that intercropping red clover and no grass; the content of EE-GRSP in the soil that intercropping bahia grass, white clover and red clover was significantly higher than that of no grass. Sod-culture increased soil microbial biomass in the rhizosphere soil of olive, among them intercropping bahia grass promoted the microbial biomass phosphorus and intercropping leguminous grasses promoted microbial biomass nitrogen significantly. Overall, sod-culture improved the diversity of arbuscular mycorrhizal fungi in the rhizospheric soil of olive, and the improving effect on AMF diversity of intercropping bahia grass was better than that of the other treatments.