Abstract
Peroxidase activity can be an important soil property for predicting soil organic matter dynamics, but peroxidase control on organic matter degradation has not yet been fully understood. We hypothesized that peroxidase could enhance soil C and N mineralization via improving the bioavailability of reducing sugars and amino acids. First, an arable soil (~13 g dry weight equivalent) was amended with horseradish peroxidase at 0, 0.1, and 0.2 activity units g−1 soil, and then examined for peroxidase and hydrolase activities, water-extractable phenolic content, and soil C and N mineralization over a 21-day incubation. Soil C mineralization was enhanced by peroxidase addition, but it was not correlated with the concentration of water extractable phenolics or hydrolase activity. Exoglucanase and β-glucosidase activities were significantly lower in soil amended with peroxidase at 0.2 units than at 0.1 units. Second, peroxidase, cellulase, protease or their combinations were added into sterile soils to examine enzyme-catalyzed productions of soluble reducing sugars and amino acids. Reducing sugar concentration was increased after peroxidase addition and this effect was more pronounced when both peroxidase and hydrolases were added. Thus-produced reducing sugars and amino acids were significantly correlated with soil C and N mineralization (Pearson’s correlation coefficient, r = 0.65 and r = 0.63, P < 0.01), respectively. Our results indicated that the effects of peroxidase on organic matter degradation were not through the production of soluble phenolics or the enhancement of hydrolase activity. Instead, by oxidizing phenolics soil peroxidase liberated carbohydrates and proteins that were otherwise encapsulated in soil humus and thus inaccessible to soil hydrolases and microbes.
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Acknowledgements
We thank Ms. Emily Dell, Ms. Melissa Bell and Dr. Jianjun Dai for helping in soil collection and preparation, and the NCSU Environmental and Agricultural Testing Service laboratory for total soil C and N analyses. This study was financially supported by the USDA-SSARE grant and the North Carolina Agricultural Research Services.
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Tian, L., Shi, W. Soil peroxidase regulates organic matter decomposition through improving the accessibility of reducing sugars and amino acids. Biol Fertil Soils 50, 785–794 (2014). https://doi.org/10.1007/s00374-014-0903-1
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DOI: https://doi.org/10.1007/s00374-014-0903-1