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| Effect of biochar on N2O emissions from agricultural soil |
| Received:May 28, 2018 |
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| KeyWord:biochar;N2O;nitrate nitrogen;ammonium nitrogen |
| Author Name | Affiliation | E-mail | | ZHAO Guang-xin | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
College of Agronomy and Resources Environment, Tianjin Agricultural University, Tianjin 300384, China | | | LIU Xing-ren | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China | liuxr1976@126.com | | ZHANG Qing-wen | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | TIAN Xiu-ping | College of Agronomy and Resources Environment, Tianjin Agricultural University, Tianjin 300384, China | |
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| Abstract: |
| As a soil amendment, biochar plays an important role in soil N transformation and reducing greenhouse gas emissions. The purpose of the experiment is to study the N2O emission reduction potential under different N rates with biochar addition, and to provide a theoretical basis for the reduction potential of biochar. A pot experiment was conducted from June 18 to September 25 in year 2015, and the effects of biochar on N2O emissions under different N levels in farmland soil were studied. The experiment consisted of four treatments with three replicates. The treatments were CK (non-N application), N1 (200 kg·hm-2), N2 (400 kg·hm-2), and N3 (600 kg·hm-2). A biochar amount of 15% (W/W) of the pot soil was applied to each treatment. The results showed that the cumulative N2O emissions increased with N rates. There was no significant difference between N2 and N3. The emission factors (EFs) of N1, N2, and N3 were 1.33%, 1.27%, and 0.90%, respectively, and the EFs decreased with increasing N rate. The correlation analysis showed that N2O fluxes were significantly positively correlated with soil water-filled porosity (WFPS), soil NO3--N content, and soil microbial biomass nitrogen (MBN) (P<0.01), and that N2O fluxes were significantly negatively correlated with soil pH (P<0.01). The addition of biochar has great potential to reduce N gas loss. The combined application of biochar and N fertilizer has a good retention effect on soil N. |
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