Abstract:
Objective Correlation between the diversity of AM fungal community and the fertility of rhizosphere soil of avocado orchards in Guangxi, Yunnan, and Guangdong provinces was studied.
Method Spores of AM fungi collected from the field samples were isolated by wet screening and identified morphologically. The fungal diversity and nutrient contents in the soil specimens were determined.
Result Thirty-three species from 3 genera of AM fungi were isolated and identified. They included 22 species of Glomus, 7 of Acaulospora, and 4 of Scutellospora. Among them, G. manihotis, A. rehmii, S. rubra, and S. reticulate were dominate species, and G. claroideum, G. luteum, G. reticulatum, G. coronatum, G. verruculosum, A. scrobiculata, and S. verrucose were commonly found in all samples. The Sorenson similarity coefficients on the AM fungi in the rhizosphere soils varied between 0.29 and 0.92 and were generally extremely high or high. The species richness and Shannon-Wiener index of the fungal community significantly inversely correlated with the available phosphorus in soil.
Conclusion The AM fungi in avocado rhizosphere soil were highly diverse with Glomus being the predominant species, and the population inversely correlated to the phosphorus content in soil.
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