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| Effects of Different Elution Pretreatments on Mineralization of Biochars in Presence of Active Organic Matters |
| Received:March 27, 2015 |
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| KeyWord:biochar;active organic matter;mineralization |
| Author Name | Affiliation | E-mail | | WANG Lei | College of Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China | | | DAI Jing-yu | College of Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China | | | WANG Ying-hui | College of Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China | daijy@njau.edu.cn |
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| Abstract: |
| Biochar added to soil could reduce the mineralization of soil organic carbon. However, relatively degradable pyrolysis by-products remained on the biochar surface during manufacturing might interfere the effects of biochar itself. Here we investigated the mineralization of biochar pretreated with different solvents in the presence of active organic matters(AOM). Biochar produced at 400 ℃ was pretreated with four solvents(ultrapure water, dilute acid, dilute alkali solution and ethanol) and then incubated with AOM(glucose, glutamic acid) at 30 ℃ in dark. The biochar mineralization was assessed by CO2 emissions. Different pretreatments had significant influence on the mineralization of biochar during 110 day incubation. Generally, cumulative CO2 emissions from biochar and AOM mixture were lower than that from AOM alone, demonstrating mitigating effect of biochar on AOM mineralization. The interactions between biochar and AOM were affected by biochar surface properties and the nature and concentration of AOM. Biochars and AOM synergistically promoted the mineralization at the beginning of incubation but showed a co-stabilizing effect at later stage. |
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