The screening, identification of arbuscular mycorrhizal fungi in Northwestern vineyards

The distributions of arbuscular mycorrhizal（AM）Fungi at 060 cm soil layers of 5 vineyards in Northwestern area were studied in this paper. The results showed that grape has colonization with AM fungi, and the highest colonization is about 79%. 22 species of 4 genera of AM fungi are isolated from the soil samples in the 5 vineyards, and 15 species of them belong to Glomus, 4 belong to Acaulospora, 2 belong to Scutellospora and 1 belongs to Gigaspora. The diversities of AM fungi in the different sampling sites are different. The spore density in the Jingyang, Shaanxi (JY) sampling site is the highest, the second is Yongji, Shanxi (YJ), and followed by Yangling, Shaanxi(YL) and Yinchuan, Ningxia(YC) sampling sites. The sampling site with the lowest spore density is Mogao, Gansu (MG), which is less than 110 spore in per 100 grams sample. The AM fungi species richness is also varied in different sampling sites, Jingyang(JY) sampling site is the highest. The relative abundance of AMF genus is GlomusAcaulospora ScutellosporaGigaspora. Glomus is the dominant genus at all times. The dominant stains are G. intraradices，G. mosseae，G. versiforme in different sample sites, while the G. coronatum，G. fasciculatum， A. scrobiculata are rare stains in most sample sites.