The Diversity Analysis Of AM Fungi In The Rhizosperic Soil Of Allium Species In Leymus Chinensis And Stipa Grandis Communities In Inner Mongolia

In this paper, Allium plant species from the typical steppe were collected and examined to research the relationship of AM fungi and a restoration of a degraded typical steppe. The main conclusion is as follows:1. Fifteen spcies of AMF were isolated from the rhizosperic soil of Allium plant species of Leymus chinensis and Stipa grandis communities in Inner Mongolia. Four species belong to Acaulospora.Ten belong to Glomus.One belong to Scutellospora. Fore species were uncertain.They were Acau. sp1, Acau. sp2, Acau. sp3 and G. sp1.2. All of Allium plant species were infected with arbuscular mycorrhizal fungi (AMF), and their mycorrhizae belong to Arum-type based on their morphological features. There are differences in colonization rates among them, ranged from 32.5% to 84.0%. Colonization rates were higher in a restoration area of a degraded typical steppe, and higher in A.ramosum. 3. The changes of the diversity of AMF accompanied with the changes of sample sites, season and plant species. The species richness, spore density, relative abundance was higher in a restoration area of a degraded typical steppe, and higher in A.bidentatum.4. The test of soil factors and phosphatase activity show:the content of total Phosphorus,Avialable Phosphorus,Total Nitrogen,Alkali-decomposed Nitrogen and Organic Matter were higher in the site of Leymus chinensis;the colonization rates have distinct difference among total Phosphorus,Avialable Phosphorus, Organic Matter and Neutral phosphatase activity(P>0.05), and have on distinct difference among Total Nitrogen,Alkali-decomposed Nitrogen and Alkaline phosphatase activity.