Arbuscular Mycorrhizal Fungi in Cultivated Soil in Sichuan

Arbuscular mycorrhizal fungi(AMF) were investigated in main arable fields throughout Sichuan.Sampling of soil was carried out to a depth of 30 cm in the rootsphere.Arbuscular mycorrhizal fungi were found at all 50 sampling sites,at average 305 spores per 100 g dry weight of soil(for 95% probability).18 identified species of arbuscular mycorrhizal fungi from these soil samples belong to 3 genera: Acaulospora,Scutellospora and Glomus.The species richness of Gl.mosseae,Gl.caledonium and Gl.constrictum was more than 10 percent,so they were the dominant species in these samples.The species richness of every sample was arranged from 1 to 7,the average value was 3.3.It was greatly influenced by the amount of QRP.AMF in purple soil was very fine in comparison with others.There was a significant correlation between the quantity and species and the type of soil on the analysis of linear regression(p0.01).The species composition of AMF was also greatly influenced by the elevation.