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| Effects of peanut shell biochar on physico-chemical properties and greenhouse gas emission in fluvo-aquic soil and red soil |
| Received:December 11, 2017 |
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| KeyWord:biochar;soil type;greenhouse gas emission;net integrated greenhouse effect |
| Author Name | Affiliation | E-mail | | FANG Ming | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | REN Tian-zhi | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | LAI Xin | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | WANG Zhi-wen | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China
College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China | | | SONG Ting-ting | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China
College of Plant Protection, Shenyang Agricultural University, Shenyang 110866, China | | | LI Jie | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | lijie@caas.cn | | ZHANG Gui-long | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | zgl-2008@126.com |
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| Abstract: |
| The present study evaluated the effects of different concentrations of biochar(0%, 0.5%, 1%, 2%, and 4%) on the physico-chemical properties of red and fluvo-aquic soils, and the emission of greenhouse gases(GHGs). A pot experiment was set with different treatments, and the GHGs emitted were measured by static chamber-gas chromatographic techniques. The results showed that biochar application had significant effects on the greenhouse gas emission, and the two soils showed different gas emission characteristics. In general, the cumulative emission of N2O from the fluvo-aquic soil was significantly higher than that in the red soil. Compared with the single application of nitrogen fertilizer treatment(MN), biochar application led to a 6.5%~26.6% decrease in cumulative emission of N2O from the fluvo-aquic soil. In contrast, the cumulative emission of N2O from the red soil increased with increase in the concentration of biochar. It increased from 14.7% to 54.3% when compared with the single application of nitrogen fertilizer treatment(RN). The 0.5% biochar treatment significantly increased CO2 emission from the fluvo-aquic soil; it increased the cumulative emission by 25.9%. However, the 0.5% biochar treatment did not significantly affect the cumulative emission of CO2 from the red soil. In addition, the CH4 emission flux of the two soils changed irregularly under different treatments, and the cumulative emission of CH4 was negligible. A comparison of treatments MCK(blank control for fluvo-aquic soil), RCK(blank control for red soil), MN, and RN(without biochar application) revealed that the carbon sequestration of both the soils increased significantly with increase in the concentration of biochar. In the fluvo-aquic soil, the increase was by 57.1%~78.7%, while in the red soil, it was 11.2%~59.9%. The biochar application enhanced greenhouse gas emission intensity(GHGI) of the fluvo-aquic soil by 68.0%~76.8%, while it had no significant effect on the GHGI of the red soil. The results suggested that biochar application could significantly increase the GHGI and inhibit the growth of crops in the fluvo-aquic soil. The increase in GHGI was owing to change in the soil bulk density and content of organic carbon, inorganic nitrogen, and other nutrients. Furthermore, biochar application to red soil had better ecological effects. It could promote the growth of crops(as evidenced by the fact that its GHGI did not increase significantly) and enhance soil carbon sequestration. |
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