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To unveil the carbon release capacity of humic soil and its potential applications in wastewater treatment, this study explored the impact of various aeration gradients on the release of dissolved organic matter（DOM）from humic soil. By establishing gradients of no aeration, low aeration, medium aeration, and high aeration, the carbon release experiment lasting 600 hours was conducted. The carbon release capacity at various time points and DOM changes in components were monitored with the aid of total organic carbon（TOC）analysis, three-dimensional fluorescence spectroscopy-parallel factor analysis（EEM-PARAFAC）, and UV-visible absorption spectroscopy. Results showed that aeration intensity significantly affected the amount and cycle of carbon release from humic soil. Before reaching medium aeration, the carbon release capacity increased with the intensity of aeration, followed by a decrease afterwards. Aeration was found to enhance the release of aromatic protein-like substance I（C1）and humic-like substances（C3）. However, the intensity and effectiveness of the enhancement varied between these two components. Conversely, aeration suppressed the release of aromatic protein-like substance II（C2）and soluble microbial metabolic substances（C4）, where differences were also observed. UV-visible absorption analysis indicated that the aromaticity and humification degree of DOM increased over time during the carbon release process from humic soil. The carbon release cycle was about 248h during the 600-h test, higher aeration intensities were found to improve the microbial utilization of DOM.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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