Humus composition and humic acid-like structural characteristics of corn straw culture products treated by three fungi
2021
Zhang, Yifeng | Dou, Sen | Yeh, Diana | Zhang, Dandan | Ndzelu, Batande Sinovuyo | Zhang, Xiaowei | Shao, Manjiao
In the view of studying humus formation in corn straw under the action of microorganism, three fungi (Trichoderma reesei, Trichoderma harzianum, Phanerochaete chrysosporium) were selected to compare the humification effects and structural changes of humic acid-like (HAL). The structural characteristics of HAL formed by fungi from corn straw were assessed by elemental, thermogravimetric analyzer, Fourier transform infrared (FTIR) and ¹³C CPMAS NMR spectroscopies. The results showed that Phanerochaete chrysosporium had a strong ability to increase aliphatic C (increasing to 60.02%) within 30 days, and utilised aromatic C in HAL during the humification process. The Trichoderma harzianum selectively preserved relatively large quantities of aromatic C in HAL and reduced aliphatic C to 56.49%. Trichoderma reesei enhanced aromaticity and I ₂₉₂₀/I ₁₆₂₀ ratio of HAL to 38.48% and 0.80, respectively, and intensified the humification effect (PQ=63.75%) within 30 days. Moreover, the elemental composition of HAL in Trichoderma reesei was closest to that of soil humic acid. We concluded that treating corn straw with Trichoderma reesei could reduce aliphatic C and enhance aromatisation, thermal stability, and accumulation of alkyl C, phenolic and aromatic C, which can promote the humification process of corn straw and contribute to the accumulation and storage of soil organic matter.
显示更多 [+] 显示较少 [-]