摘要：

The differences of humus fractions largely affect the composition of soil humus,which can be used directly to measure the degree of soil fertility and soil aging.The interaction between a stable humus with structural complexity and soil microorganisms can achieve full or partial decomposition of humus,which can generate new humus,making the soil organic matter updated at the same time.Apparently,the microorganisms and the formation of humus can have a close correlation.Most of the theories of humus formation have affirmed the special role of microorganisms,but not yet formed a unified opinion now.This article mainly discussed the effect of different organic carbon sources(glucose,cellulose and lignin)that were degraded by the soil microorganisms on the formation of HS,the decomposition ability of different microorganisms(bacteria,fungi and actinomycetes) to HS and the impact of inoculating different microorganisms to the formation of humus components and the compost quality to uncover the differences of different microorganisms on the formation of different humus fractions and proposed the prospect of relevant studies.

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