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| Effects of nano-carbon sol and urea on soil N2O emissions |
| Received:October 13, 2022 Revised:January 11, 2023 |
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| KeyWord:nano-carbon;N2O;nitrification;denitrification;soil |
| Author Name | Affiliation | E-mail | | JI Cheng | Institute of Agricultural Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
School of Environment & Safety Engineering, Jiangsu University, Zhenjiang 212013, China | | | SUN Yuxiang | Institute of Agricultural Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Nanjing Agricultural University, Nanjing 210095, China | | | MENG Yuan | Institute of Agricultural Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Nanjing Agricultural University, Nanjing 210095, China | | | XU Cong | Institute of Agricultural Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
School of Environment & Safety Engineering, Jiangsu University, Zhenjiang 212013, China | | | WANG Jidong | Institute of Agricultural Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
School of Environment & Safety Engineering, Jiangsu University, Zhenjiang 212013, China
Nanjing Agricultural University, Nanjing 210095, China | jdwang66@163.com | | ZHANG Yongchun | Institute of Agricultural Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
School of Environment & Safety Engineering, Jiangsu University, Zhenjiang 212013, China
Nanjing Agricultural University, Nanjing 210095, China | |
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| Abstract: |
| Nano-carbon improves fertilizer utilization and reduces nitrogen residue in soils; however, its effects on soil N2O emissions still remain unclear. In this study, nano-carbon sol（a kind of nano-carbon material prepared via electrolytic graphite）and soils without and with straw returning were selected for comparison. We conducted an incubation experiment to study the effects of nano-carbon on soil N2O emissions, with soil microcosm exhibiting a temperature of 25 ℃ and water-holding capacity of 80%. Results showed that the nano-carbon amendment significantly increased N2O emissions from the straw-removed soil, but significantly decreased N2O emissions from the strawreturned soil, with the mitigation efficiency of 63%. The nano-carbon also significantly increased potential nitrification rates（PNR）from the straw-removed and -returned soils and decreased potential denitrification rate（PDR）from the straw-returned soil. The PDR value of the straw-removed soil showed no significant response to the nano-carbon amendment. Nano-carbon increased N2O emissions due to the enhanced nitrification in the straw-removed soil. The mechanism of decreased N2O emissions from the straw-returned soil amended with nano-carbon sol might be that the amendment increased the contents of dissolved organic carbon, thus inducing the immobilization of inorganic nitrogen by soil heterotrophic microorganisms and promoting the complete denitrification process. |
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