Abstract
Effects of 4 low molecular weight organic acids with low(4 mmol·kg-1 dry soil), medium(20 mmol·kg-1 dry soil) and high concentration(100 mmol·kg-1 dry soil) on soil microbe number, respiration intensity and enzyme activities were investigated by indoor culture experiments. The results showed that with increasing concentration, soil bacteria number and respiration intensity of formic acid, oxalic acid and citric acid treatments were continuously elevated, and soil fungi number was continuously decreased, while actinomycete number was increased at low concentrations and reduced at medium and high concentrations. Soil microbe number and respiration intensity of benzoic acid treatment showed a pattern different from that of the above three organic acid treatments.Soil fungi number was increased with increasing concentration, and soil bacteria number, actinomycete number and respiration intensity was increased at low concentrations and decreased at medium and high concentrations. Soil amylase, urease, phosphatase activities of formic acid treatment as well as catalase, dehydrogenase activities and biological fertility of soil(BIF) of benzoic acid treatment were enhanced at low concentrations and reduced at medium and high concentrations. Catalase, dehydrogenase, BIF of formic acid treatment, protease, dehydrogenase, enzyme activity number(EAN), BIF of both oxalic acid and citric acid treatment, protease, urease of benzoic acid treatment showed a continuously increasing trend with increasing concentration. Soil ecological quality of benzoic acid treatment at low concentrations, citric acid treatment at medium concentrations and oxalic acid at high concentrations were the highest.
Published Version
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