Prof. Sen Dou1, Lili Wang2, Lobo Li1, Xuyang Shi3, Xintong Liu3, Xiaodong Ren3
1College of Resource and Environmental Science, Jilin Agricultural University, Changchun, China, 2School of Life Science, Anhui University, Hefei, China, 3School of Life Science, Jilin University, Changchun, China
Cellulase production from straw waste by Trichoderma reesei has been widely applied, yet the conversion of fermentation residues into humic substances is less reported. The objectives of this study are to evaluate the impacts of Trichoderma reesei on the degradation of corn stalk residue under solid-state fermentation from quantitative and structural aspects. The results show that the highest decomposition rate of corn stalk and the highest activity of cellulase, xylanase and β-glucosidase were got at the 4th day. The cumulative degradation rate was 40.78% after 8 days fermentation. Humus like substance including humic acid-like (HAL), fulvic acid-like (FAL) and humin-like material (HML), is a major transformation product of corn stalk residues. FAL and HML significantly decreased during fermentation, whereas HAL and PQ value (the ratio of HAL / [HAL + FAL]) appeared to be increased. Moreover, HAL degrees of condensation, oxidation, aromatization as well as HAL thermal stability were all enhanced. The data in this study suggest that the fermentation of corn stalk amended with Trichoderma reesei is not only beneficial to the degradation of stalks, but also promotes the transformation of corn stalk to humus, which provide available use of Trichoderma reesei in agricultural soil amelioration.
Acknowledgements This work was financially supported by the National Key Research and Development Program of China (grant No. 2016YFD0200304)
Prof of College of Resource and Environmental Science, Jilin Agricultural University.