Relationship between soil properties and the colonization of arbuscular mycorrhizae inSongnen Saline-alkaline Grassland

To determine the relationship between the rhizosphere soil and AM (Arbuscular Mycorrhizal) fungi in Songnen saline-alkaline grassland, twenty six species in eleven families from Songnen saline-alkaline grassland were gathered and the colonization of AM fungi together with the physicochemical properties of rhizosphere were analyzed in July, 2013. The results showed that all the plant species were colonized by AM fungi, among which Taraxacum mongolicum got the highest colonization rate of 79.25%, while Polygonum aviculare got the lowest colonization rate of only 3.37%. Meanwhile, significant positive correlations were found between organic matter content and total nitrogen content of rhizosphere soil and the mycorrhizal colonization rate, colonization intensity, vesicle abundance and arbuscule abundance of AM fungi (P0.01); whereas significant negative correlations were shown between pH value and total salt content of the soil and the vesicle abundance of AM fungi (P0.05), with the correlation coefficient were －0.729 and －0.449, respectively. These experimental results indicated that the organic matter contents and total nitrogen contents of soil had a significant influence on the forming of AM fungi, whereas pH value and total salt content only had a certain influence on vesicle abundance.