Abstract: Because of the smaller body size of soil meso- and microfauna, no meth ods are preferable for the direct determination of their biomass; while model es timation, as an indirect method, is not widely used due to its time-consuming. Therefore, there is a lack of the index soil meso- and microfauna biomass in mos t published literatures. In this paper, potassium dichromate volumetry and chlor oform fumigation extraction were adopted to determine the organic carbon content of soil meso- and microfauna, and the obtained data were compared with those of model estimation. The results showed that potassium dichromate volumetry had the advantages of rapid and easily handling, being available for the batch dete rminations of soil meso- and microfauna biomass.

Key words: Chlorella vulgaris, Active substance, Extraction, Saccharomycete, Physiological effects