Impacts of biochar addition on greenhouse gas fluxes from soils subjected to freeze-thaw process

LIU Xiang, HAN Jiangang, LI Lanhai, ZHU Yongli

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2017, Vol. 41 ›› Issue (03) : 15-21.

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南京林业大学学报（自然科学版）
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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2017, Vol. 41 ›› Issue (03) : 15-21. DOI: 10.3969/j.issn.1000-2006.201702012

Impacts of biochar addition on greenhouse gas fluxes from soils subjected to freeze-thaw process

  • LIU Xiang1,2, HAN Jiangang3, LI Lanhai1*, ZHU Yongli3*
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Abstract

【Objective】 Investigating the impacts of biochar addition on carbon dioxide(CO2), methane(CH4)and nitrous oxide(N2O)fluxes from soils subjected to freeze-thaw process could provide basis for the mitigation of soil greenhouse gas emissions during freeze-thaw period. 【Method】 Intact soil cores were collected from a cropland in the Ili River Valley and then subjected to freeze-thaw processes with different freeze-thaw amplitudes(+5 ℃, -5 ℃ - +5 ℃ and -10 ℃ - +10 ℃)in the laboratory, to explore the responses of soil CO2, CH4 and N2O fluxes to biochar addition(0, 20 and 40 t/hm2)during freeze-thaw process. 【Result】 CO2 fluxes from soils with biochar additions were 1.1-1.4 times higher than those from soils without adding biochar. However, such increases were lower compared to the promoting effects of freeze-thaw on soil CO2 flux(1.5-3.2 times). Although freeze-thaw process did not significantly(P > 0.05)affect the cumulative flux of soil CH4, biochar additions significantly(P < 0.05)increased soil CH4 flux by approximately 45.5%-81.8%. Biochar decreased soil N2O flux by 10.2%-30.9% during freeze-thaw process, but such decreases were not significant(P > 0.05)in most cases. 【Conclusion】 Biochar addition may increase the emission of soil CO2, while promote the uptake of soil CH4 and the mitigation of soil N2O during freeze-thaw process.

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LIU Xiang, HAN Jiangang, LI Lanhai, ZHU Yongli. Impacts of biochar addition on greenhouse gas fluxes from soils subjected to freeze-thaw process[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2017, 41(03): 15-21 https://doi.org/10.3969/j.issn.1000-2006.201702012

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