秸秆还田对复合菌剂定殖能力及小麦促生效应的影响OA

[Objective]The insufficient colonization ability of microbial inoculants in farmland soil led to a short duration of functionality,which significantly impacted their application efficacy.This study aimed to ex-plore the effect of straw return on the plant growth-promoting function of a certain composite microbial inoculant from the perspective of colonization ability.[Method]Using a composite inoculant(cellulose-degrading bacte-rium Bacillus sp.CGMCC19895+plant growth-promoting bacterium Alcaligenes sp.CGMCC21555)as the research subject,the interaction between the two strains,as well as the plant growth-promoting and colonization abilities of different strain combinations,were tested to clarify the effects of different inoculation treatments on the soil colonization ability of the strains under straw return and non-return conditions,and to assess its correla-tion with wheat growth promotion.[Result]Neither antagonistic nor mutually promotive relationships were ob-served between the two strains when they were cultured on the plates.Regardless of straw return,the biomass of wheat in single-inoculation(CGMCC19895 or CGMCC21555)and co-inoculation treatments was higher than that in the control treatment.Without straw return,the below-and above-ground biomass of wheat in the co-in-oculation treatment significantly increased by 54.22%and 46.90%,respectively,compared with the control.But the above-ground biomass was significantly lower than that in the single inoculation CGMCC21555 treat-ment(P<0.05).With straw return,the below-ground biomass in the co-inoculation treatment increased by 237.52%and the above-ground biomass increased by 58.48%compared with the control.Moreover,the below-ground biomass was significantly higher than that in any single strain inoculation treatment.Without straw re-turn,the soil colonization quantity of CGMCC19895 in the co-inoculation treatment was significantly decreased by 59.07%(P<0.05)compared with that in single inoculation treatment,while the colonization quantity of CGMCC21555 was significantly increased by 55.83%(P<0.05).With straw return,the colonization quantity of CGMCC19895 on the surface of straw in the co-inoculation treatment showed no significant difference from that in the single inoculation treatment,but the colonization quantity of CGMCC21555 on the surface of straw significantly increased by 109.63%(P<0.05)compared with that in single inoculation treatment.[Conclusion]The addition of straw altered the colonization abilities of the two strains in the soil and on the surface of straw,significantly enhanced the colonization efficiency of CGMCC21555 on the surface of straw,and strengthened the synergistic colonization effect and plant growth-promoting function of the composite microbial inoculant.