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| Effects of biochar addition on N2O and CO2 emissions in Hainan dry red soil |
| Received:February 17, 2021 |
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| KeyWord:dry red soil;biochar;soil N2O emission;soil CO2 emission |
| Author Name | Affiliation | E-mail | | LIU Lijun | College of Tropical Crops, Hainan University, Haikou 570228, China | | | ZHU Qilin | College of Tropical Crops, Hainan University, Haikou 570228, China | | | LI Kaikai | College of Tropical Crops, Hainan University, Haikou 570228, China | | | LI Miao | College of Tropical Crops, Hainan University, Haikou 570228, China | | | MENG Lei | College of Tropical Crops, Hainan University, Haikou 570228, China | | | WU Yanzheng | College of Tropical Crops, Hainan University, Haikou 570228, China | | | TANG Shuirong | College of Tropical Crops, Hainan University, Haikou 570228, China | | | HE Qiuxiang | College of Tropical Crops, Hainan University, Haikou 570228, China | 46060398@qq.com |
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| Abstract: |
| To investigate the response of N2O and CO2 emissions to biochar addition in dry red soil in Hainan, the effects of biochar addition on soil chemical properties, ammonium nitrogen and nitrate content, N2O and CO2 emission fluxes, and cumulative emissions were analyzed through laboratory incubation experiments. Four treatments were set up:CK(no biochar), B1(2% biochar), B2(4% biochar), and B3(6% biochar). The results showed that the content of soil organic matter, total nitrogen, and available potassium increased significantly by 67.4%~246.6%, 38.6%~90.9%, and 696.0%~1 764.7%, respectively, compared with CK,and the content of NH4+-N and NO3--N decreased after the addition of biochar. In general, the concentration of NH4+-N in the different treatments was CK>B3>B2>B1, and the content of NO3--N was CK>B1>B2>B3. With the extension of incubation time, the concentration of NH4+-N in each treatment decreased, while the concentration of NO3--N increased. Biochar application delayed the peak N2O emission flux. Variations in N2O and CO2 emission fluxes among different treatments showed a consistent trend; that was, with the extension of incubation time, N2O and CO2 emission fluxes first increased and then decreased, and then increased again with the extension of incubation time. Compared with CK, the addition of biochar promoted N2O and CO2 emissions to some degree, the cumulative N2O emissions increased by 399.2%, 494.2%, and 194.5% under treatments B1, B2, and B3, respectively, and the total CO2 emissions increased by 87.6%, 153.3%, and 147.6%, respectively. The results show that biochar application increase N2O and CO2 emissions in the short term. |
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