Impacts of biochar addition on greenhouse gas fluxes from soils subjected to freeze-thaw process
LIU Xiang1,2, HAN Jiangang3, LI Lanhai1*, ZHU Yongli3*
Author information+
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
【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.
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
中图分类号:
S154.2
X171.1
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参考文献
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