Variation in Rhizosphere Microbes of Three Shelter Shrubs in Drift Desert Hinterland in Xinjiang,China

Rhizosphere and nonrhizosphere soils were sampled layer by layer along the Tarim Desert Highway growing with three shelter shrubs(Haloxylon ammodendron,Calligonum mongolicum and Branchy tamarisk) and were used to study rhizosphere microbes' effects and their relationships with various soil environmental factors.The results showed that the effects of the rhizosphere soil microbes of the three shrubs were positive,and ranked in H.ammodendron C.mongolian B.tamarisk in terms of R/S value.The differences in microbial community structures in the rhizosphere soil with different shrubs were insignificant.The rhizosphere bacteria were dominant,accounting for 78.10%～93.18% of the total soil microbes,while actinomyces second dominant,and fungi accounting for only 0.03%～0.12%.Compared with the nonrhizosphere soil,the content of nutrients in rhizosphere soil was higher but salt content was lower,which provided better soil conditions for the growth of soil microbes.However,the key soil environmental factors related to microbial growth and development were different among bacteria,actinomyces and fungi.In conclusion,the plantation of H.ammodendron promoted the development of aeolian soil in desert hinterland,and H.ammodendron should be widely planted for enhancing the ability of controlling wind and sand in desert regions.