Abstract: UsingHordeum bogdaniiseeds with endophytic fungi (E+) and without endophytic fungi (E－) as materials, seedlings were planted in greenhouses at first and then transplanted in fields with different salinity and alkalinity. The surface soils sampled in spring, summer and autumn, and spring samples as control groups, were used to determine the activities of catalase, urease, sucrase and alkaline phosphatase, as well as the contents of organic carbon, total nitrogen, total phosphorus, total potassium, available phosphorus and available potassium. The results showed that the contents of urease, sucrase, alkaline phosphatase, organic carbon, nitrogen, and potassium were the highest under moderate salt stress. With the increase of planting time ofH. bogdanii, the contents of catalase, carbon, nitrogen, phosphorus, potassium, and available potassium had no significant change. The contents of urease, sucrase, and available phosphorus increased, and the activity of alkaline phosphatase increased under medium salt. Moreover, the soil enzyme activity and the contents of carbon, nitrogen, phosphorus, potassium, available phosphorus, and available potassium in E+H. bogdaniiwere mostly higher than those in E－ under different salt levels. This indicated that endophytic fungi infection could improve the enzyme activity and soil nutrients of near plants by regulating them, laying a certain foundation for further research on the impact of endophytic fungi expansion on soil microbial diversity inH. bogdanii.

Key words: endophytic fungi;Hordeum bogdanii, soil salinization, enzyme activity, soil nutrient