Abiotic mechanisms for biochar effects on soil N2O emission
Chaohui He 1,2,3
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University of Chinese Academy of Sciences, 19(A) Yuquan Road, Shijingshan District, Beijing 100049, China
Key Laboratory of Agricultural Water Resources, Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, 286 Huaizhong Road, Yuhua district, Shijiazhuang 050022, China
Sino-Danish Center for Education and Research, Estern Yanqihu Campus, 380 Huaibeizhuang, Huairou district, Beijing 101408, China
Aarhus University, Department of Agroecology, Blichers Allé 20, 8830 Tjele, Denmark
Final revision date: 2019-07-02
Acceptance date: 2019-08-07
Publication date: 2019-10-30
Int. Agrophys. 2019, 33(4): 537-546
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 apple-tree biochar surfaces since C = O and C-O bonds both increased and C=C/C-C/C-H declined.
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