中文摘要：

分层采集塔里木沙漠公路3种防护林灌木梭梭、沙拐枣、红柳的根际土和非根际土,分析土壤微生物的根际效应及其与土壤环境因子间的关系.结果表明,3种防护林树种的根际土壤微生物均有比较明显的正效应,R/S值大小为梭梭〉沙拐枣〉柽柳;土壤微生物区系组成在不同树种根际土之间变化不大,其中细菌介于78.10%～93.18%,为优势类群,放线菌次之,真菌仅为0.03%～0.12%;与非根际土相比,根际土壤养分含量较高,盐分含量较低,为微生物营造了较好的土体条件.可见,沙漠腹地定植灌木对风沙土发育有较明显的促进作用,尤其是梭梭,建议实际林分配置中可适当提高梭梭的比例.

英文摘要：

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.