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21 June 2021 Slow pyrolysis pine wood-derived biochar reduces nitrous oxide production from surface but not subsurface soil
Hongyuan Deng, Leanne Ejack, Shamim Gul, Shiv O. Prasher, Joann K. Whalen
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Abstract

Soil amended with biochar is expected to produce less nitrous oxide (N2O), although this may depend on nitrate (NO3-N) availability. Our objective was to determine how pine wood biochar, slow pyrolyzed at 500 °C, affects N2O production in soil having different denitrification potentials with variable NO3-N concentrations under controlled laboratory conditions. Sandy loam surface soils (0–30 cm, pH 5.7) and sandy clay loam subsurface soils (40–60 cm, pH 5.6) were amended with four biochar rates (0, 10, 20, and 30 g·kg−1), two nitrogen fertilizer rates (0 and 100 mg·kg−1 NO3-N) and two acetylene levels (0% and 10% headspace), arranged as a full factorial. Soil moisture content was adjusted to 80% water-filled pore space, and flasks were incubated at 20 °C for 30 h. Headspace gas was collected from each flask at 25, 26, 28, and 30 h. There was a significant reduction in N2O production with an increasing rate of biochar in the surface soil but not in the subsurface soil. On average, less N2O was produced in the subsurface soil than in the surface soil. As the NO3-N concentration was not a limiting factor for denitrification, the most likely explanation was that denitrifier activity was influenced by the availability of soluble organic carbon in the soil–biochar mixtures. We recommend further study of the coupled carbon–nitrogen transformations during denitrification to understand how biochar influences soil N2O production in sandy loam soils.

Hongyuan Deng, Leanne Ejack, Shamim Gul, Shiv O. Prasher, and Joann K. Whalen "Slow pyrolysis pine wood-derived biochar reduces nitrous oxide production from surface but not subsurface soil," Canadian Journal of Soil Science 102(1), 147-154, (21 June 2021). https://doi.org/10.1139/CJSS-2021-0017
Received: 22 February 2021; Accepted: 16 May 2021; Published: 21 June 2021
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KEYWORDS
anoxic incubation
denitrification
Dénitrification
incubation anoxique
profil du sol
pyrolyse lente
slow pyrolysis
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