Abstract: The soil of Foshan yam under rotation and continuous cropping for 3 years was collected, and the high-throughput sequencing technique was used to study the community diversity and composition characteristics of soil bacteria, fungi and nematodes, as well as the changes of soil physical and chemical properties and yam yield. The results showed that continuous cropping enriched soil available nutrients, decreased the yield of bergamot yam and the diversity of soil bacteria, fungi and nematodes. The community structure of soil bacteria, fungi and nematodes changed greatly. Continuous cropping significantly increased the abundance of Campylobacter, making it the main dominant group, while reducing the abundance of Proteobacteri a, Firmicutes, Gemmatimonadetes and Bacteroidetes. Under the two models, the dominant populations of fungi were Ascomycota and Basidiomycota. Continuous cropping reduced Ascomycota and increased Basidiomycota and Mucor. Continuous cropping significantly increased the abundance of soil nematodes. Therefore, compared with continuous cropping of yam, rotation could improve the structure of soil microbial community and stabilize the yield of yam, which was a better planting pattern in Wuxue yam planting area.

Key words: Foshou yam, planting pattern, soil nutrient, microbial diversity