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

doi:10.3969/j.issn.1000-2006.201702012

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2017, Vol. 41 ›› Issue (03): 15-21.doi: 10.3969/j.issn.1000-2006.201702012

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

LIU Xiang^1,2, HAN Jiangang³, LI Lanhai^1*, ZHU Yongli^3*

1. State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. Co-Innovation Center for the Sustainable Forestry in Southern China, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China

Online:2017-06-18 Published:2017-06-18

Abstract

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.

CLC Number:

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.

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

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