Studies on spacial distribution of arbuscular mycorrhizal fungi in the rhizospheres of Artemisia ordosica in Mu Us sandland

Artemisia ordosica is a kind of important sand-fixing plants and desert-steppe predominant plants in Mu Us of south of Ordos plateau.Studies on ecological distribution of arbuscular mycorrhizal fungi in the rhizospheres of Artemisia ordosica is important to accelerate growth of Artemisia ordosica,rebuild ecological environment and resume vegetation by using enough arbuscular mycorrhizal fungi resource.This paper researched species and distribution of arbuscular mycorrhizal fungi in the rhizospheres of Artemisia ordosica.Soil samples were collected in 4 replicates and divided a depth of 50 cm into 5 sections,i.e.0-10,10-20,20-30,30-40 and 40-50 cm in the rhizosphere of each plant in two representative sites from north to south in Mu Us sandland.The results showed that species and distribution of arbuscular mycorrhizal fungi took on obvious spacial character and correlated with soil factors.Glomus melanosporum was in Yanjiuzhan,Glomus aggregatum and Acaulospora rehmii were in Yulin.Mycorrhizal type was intermediate type and morphology various vesicles,colonization rate and spore density of 0-10 cm depth were maximal and they descended with soil deepth.Soil alkali solution N and organic matter had significantly positive effect on spore density.Artemisia ordosica could form symbiosis with arbuscular mycorrhizal fungi under extreme drought condition.Spore density and arbuscular mycorrhizal structures are useful indictors for microcosmic monitoring and evaluating soil environment.