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| Effects of Biochar Amendments Synthesized at Varying Temperatures on Soil Organic Carbon Mineralization and Humus Composition |
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| KeyWord:biochar（BC）; pyrolysis temperature; soil organic carbon（SOC）; mineralization; humus（HS） |
| Author Name | Affiliation | | WANG Ying-hui | College of Resouses and Environmental Science, Nanjing Agricultural University | | YANG Min | College of Resouses and Environmental Science, Nanjing Agricultural University | | HU Lin-chao | College of Resouses and Environmental Science, Nanjing Agricultural University
Changzhou Research Academy of Environmental Sciences | | LIU Wei-jing | College of Resouses and Environmental Science, Nanjing Agricultural University | | GUO Yue | College of Resouses and Environmental Science, Nanjing Agricultural University | | TANG Wei | College of Resouses and Environmental Science, Nanjing Agricultural University | | DAI Jing-yu | College of Resouses and Environmental Science, Nanjing Agricultural University |
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| Abstract: |
| Biochar（BC） was produced at 150~600 ℃. A laboratory experiment was conducted to study the influences of biochar synthesized at different temperatures on soil organic carbon（SOC） mineralization and the composition of humus（HS） contents. The results showed that the specific surface area and aromaticity of BC increased with elevated pyrolysis temperature. Soil amended with BC thus produced resulted in increased soil organic carbon（SOC） content after 400 days incubation. Cumulative CO2 release of the soil also changed after BC amendments. The value deceased with increased pyrolysis temperature. For the soils with BC synthesized at temperatures above 400 ℃ the value was lower than that of black soil. In addition, increased HS and humic acid（HA） contents were founded in the samples amended BC produced at temperatures below 400 ℃. However, similar trend was absent in samples with BC produced at temperatures above 400 ℃. Little change of H/F was observed. E4/E6 values of HA in samples with BC synthesized at 200 ℃ and 250 ℃ were significantly higher than those in other treatments, and the values with BC at 500 ℃ and 600 ℃ were significantly lower than other treatments. |
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