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| Short-term degradation of vermiculite modified rice straw biochar in soils |
| Received:April 22, 2021 |
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| KeyWord:biochar;modification;stability;soil;carbon sequestration |
| Author Name | Affiliation | E-mail | | WANG Rui | College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou 310018, China
Institute of Environment, Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China | | | LIU Yuxue | Institute of Environment, Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
Engineering Research Center of Biochar of Zhejiang Province, Hangzhou 310021, China | | | GAO Chengxiang | Institute of Environment, Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China | | | HE Lili | Institute of Environment, Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
Engineering Research Center of Biochar of Zhejiang Province, Hangzhou 310021, China | | | WANG Yuying | Institute of Environment, Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
Engineering Research Center of Biochar of Zhejiang Province, Hangzhou 310021, China | | | Lü Haohao | Institute of Environment, Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
Engineering Research Center of Biochar of Zhejiang Province, Hangzhou 310021, China | | | YANG Shengmao | Institute of Environment, Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
Engineering Research Center of Biochar of Zhejiang Province, Hangzhou 310021, China | yangshengmao@263.net | | LIANG Zongsuo | College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou 310018, China | liangzs@zstu.edu.cn |
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| Abstract: |
| Stability is the basic premise for biochar use as a mode of carbon sequestration. It is of great practical significance to explore the degradation characteristics of biochar in soils. In this study, rice straw and vermiculite were chosen as the biomass and mineral modification material to produce biochar, and the stability of the produced biochar was analyzed. Lab incubation experiments were carried out to study the short-term degradation behavior of biochar and its influencing factors. Results showed that the C content of biochar increases with an increase in carbonization temperature. After vermiculite modification, the C content of biochar reduced by 20.3%~32.6%. When the carbonization temperature increased from 300℃ to 700℃, the dissolved organic carbon(DOC) of biochar first increased and then decreased, with the maximum value at 400℃ and the minimum value at 700℃. Vermiculite modification reduced the DOC content of all biochar. With an increase in carbonization temperature, the H/C of biochar decreased. The H/C of modified biochar was lower than that of unmodified biochar. Compared with 300℃ biochar, the thermal mass loss of 700℃ unmodified and modified biochar decreased by 56.1% and 56.8%, respectively. Vermiculite modification reduced the thermal mass loss by 14.8%~45.6%. All biochar was mainly composed of aromatic C, O-alkyl C, and alkyl C, among which the content of aromatic C was the highest. With an increase in carbonization temperature, the aromatic C content in biochar increased, while the O-alkyl C and alkyl C contents decreased. Vermiculite modification increased the content of aromatic C. Compared with red soil, the C content of biochar in paddy soil was lower. Compared with flooding conditions, the C content of biochar under drought conditions was lower. These results indicate that vermiculite modification reduces the content of C in biochar and increases the stability of biochar. Compared with red soil, the C degradation of biochar in paddy soil is faster. Compared with flooded conditions, the C degradation of biochar under dry conditions is faster. Vermiculite modification is the primary factor affecting the degradation of biochar in the soil, followed by soil type and water condition. |
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