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| Effects of different microorganisms on humification of corn stover incorporated in dark brown soil |
| Received:October 25, 2015 |
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| KeyWord:humification;soil microorganisms;humic acids;element composition;FTIR |
| Author Name | Affiliation | E-mail | | LI Yan | College of Resources and Environmental Sciences, Jilin Agricultural University, Changchun 130118, China | | | DOU Sen | College of Resources and Environmental Sciences, Jilin Agricultural University, Changchun 130118, China | dousen1959@126.com | | LIU Yan-li | College of Resources and Environmental Sciences, Jilin Agricultural University, Changchun 130118, China
Academy of Agriculture and Forestry Sciences of Cangzhou City, Cangzhou 061000, China | | | WANG Shuai | College of Resources and Environmental Sciences, Jilin Agricultural University, Changchun 130118, China
Institute of Plant Science, Jilin Agriculture Science and Technology College, Jilin 132101, China | | | LI Li-bo | College of Resources and Environmental Sciences, Jilin Agricultural University, Changchun 130118, China | |
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| Abstract: |
| Humification of organic materials in soil is greatly controlled by soil microbes. Different soil microbial communities may have different roles in this process. Here the effects of different microbial communities on the humification of corn stover incorporated in dark brown soil were studied by quantitative analysis, element composition analysis, differential thermal analysis, and Fourier transform infrared spectroscopy. Results showed that microorganisms could obviously promote the humification of the amended organic material. Fungi and actinomycetes had remarkable effects on relative content of humic acids, and were main drivers of the humification process. However, bacteria played small role in the humification process. The structure analysis of humic acids and the change of PQ values(an indicator of humification degree) further revealed the promotion of HA synthesis by microbial treatments and the possibility of FA conversion to HA. Actinomycetes affected the structure of humic acids mainly via C=O bond, while bacteria and fungi respectively impacted the N and H contents of humic acids. The influence of actinomycetes on humification process was more significant at the late stage of incubation than that of other microbes for actinomycetes could make full use of fiber materials. In the actinomycete treatment, the aliphatic characteristic of FA was the most obvious and the aromaticity of HA was the highest. Fungi played a pioneering role at the early stage, mainly in the degradation of lignin. Our results affirm that the influences of different groups of microorganisms on the humification process reflect in the differences in their uses of different materials and the functional groups at different incubation stages. These findings would advance the understanding of the relationship between microorganisms and soil humus. |
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