RESEARCH PAPER
Abiotic mechanisms for biochar effects on soil N2O emission
Jiazhen Li
1,2
1
University of Chinese Academy of Sciences, 19(A) Yuquan Road, Shijingshan District, Beijing 100049, China
2
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
3
Sino-Danish Center for Education and Research, Estern Yanqihu Campus, 380 Huaibeizhuang, Huairou district, Beijing 101408, China
4
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
KEYWORDS
TOPICS
ABSTRACT
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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