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Mathias Neumann Andersen

Abiotic mechanisms for biochar effects on soil N2O emission

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  • Chaohui He, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Sino-Danish Center for Education and Research, Kina
  • Kiril Manevski
  • Mathias Neumann Andersen
  • Chunsheng Hu, Chinese Academy of Sciences, Kina
  • Wenxu Dong, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Kina
  • Jiazhen Li, University of Chinese Academy of Sciences, Kina
In this research, sterile soil columns with different contents of biochar made from apple-tree residues (0, 1 and 5% w/w) at three levels of water filled pore space (40, 60, and 80%) were set up in the laboratory to study nitrous oxide diffusion and binding processes. The results indicated that nitrous oxide emission can be effectively mitigated at 5% biochar regardless of soil water content. However, 1% biochar stimulated nitrous oxide diffusion compared to the other biochar treatments, which was opposite to expectations due to the stronger aeration than adsorption effect, while 0% had a suppression effect between 1 and 5%. Nitrous oxide emissions increased with increasing water filled pore space due to concomitantly decreasing biochar tortuousity at high water content. The increase of nitrogen from 1.11 to 1.50% on the biochar surface in the 5% treatment, and from 1.11 to 1.46% in the 100% biochar treatment, suggested that the main abiotic mechanisms for mitigation of nitrous oxide emission is adsorption and subsequent reactions with C = C bonds on appletree biochar surfaces since C = O and C-O bonds both increased and C=C/C-C/C-H declined.
OriginalsprogEngelsk
TidsskriftInternational Agrophysics
Vol/bind33
Nummer4
Sider (fra-til)537-546
Antal sider10
ISSN0236-8722
DOI
StatusUdgivet - 2019

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