将不同Ｃ／Ｎ比的植物秸秆加入灭菌后的土壤中，接种培养细菌、真菌和放线菌的纯菌株，探讨其对土壤腐殖质形成的作用。试验表明，木霉形成的ＨＡ含量最高，Ｈ／Ｆ最大，方差分析和多重比较均达极显著水平；链霉菌中灰褐类群形成的ＦＡ量最高，球孢类群形成ＨＡ的分子量最大，芳构化程度最高。 The plant straws with different C / N ratio were added to the sterilized soil, inoculated with pure strains of bacteria, fungi and actinomycetes to study their effects on soil humus formation. The results showed that the content of HA formed by Trichoderma was the highest, the H / F was the largest, and the ANOVA and multiple comparisons reached the extremely significant levels. The FA content of Streptomyces was the highest, the molecular weight of HA was the largest among Streptomyces, Degree of the highest.