寡营养细菌对古尔班通古特沙漠土壤环境的影响

利用从古尔班通古特沙漠生物结皮中分离的1株寡营养细菌制成的菌剂,喷洒在流沙表面,分析寡营养细菌对沙漠土壤微生物、酶活性、土壤养分及生物结皮形成的影响。结果表明：①喷洒寡营养细菌菌剂,提高各层土壤主要微生物数量,其中显著（P〈0.05）提高了0～2 cm土层的细菌和放线菌数量及2～5 cm层的寡营养细菌数量;②对不同土壤...

Effect of Oligotrophic Bacteria on Soil Environment in the Gurbantunggut Desert,Xinjiang,China

The oligotrophic bacteria isolated from the biotic crust in the Gurbantunggut Desert were made into solvent,and two spraying levels were set to compare the effects of oligotrophic bacteria on soil microorganisms,enzyme activities,soil nutrients and formation and regeneration of biotic soil crust.The results are as follows:(1) It could improve the numbers of bacteria,actinomycetes and oligotrophic bacteria at two soil layers(0-2 cm and 2-5 cm in depth) to spray the oligotrophic bacteria,and the numbers of bacteria and actinomycetes at 0-2 cm layer and of oligotrophic bacteria at 2-5 cm layer were more than that without spraying oligotrophic bacteria;(2) The effects of spraying the oligotrophic bacteria on soil nutrients were different,the contents of total P,total K,available N and available P were effectively improved,but the contents of soil organic matter and total N were decreased;(3) There were also the difference in the effects on soil enzyme activities,the catalase and polyphenol oxidase activities were increased,but the sucrase and alkaline phosphatase activities were reduced.The correlation analysis revealed that there was a significant positive correlation between oligotrophic bacteria and actinobacteria,and the correlations between oligotrophic bacteria and other factors were not so significant.Holistically,the original patterns of microorganisms and soil nutrients were changed by spraying the oligotrophic bacteria,and the oligotrophic bacteria were helpful to promote the existence and development of microorganisms and algae crust.Thus,the study results could open a new way for regenerating biotic soil crust and improving the conditions over sand land.