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The Effect of Biochar on the Farmland Soil CO2 Emission: A Review (Vol. 49, No.6, Tot No.344 2021) TEXT SIZE: A A A

JIANG Minghua1,2, CHENG Jianzhong1, LEE Xinqing1, GAO Weichang3, CAI Kai3, ZENG Yuntao4, JIANG Chaoying4

(1. State key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. Upland Flue-cured Tobacco Quality & Ecology Key Laboratory of China Tobacco, Guizhou Academy of Tobacco Science, Guiyang 550081, China;
4. Guizhou Provincial Tobacco Company of China National Tobacco Corporation, Guiyang 550004, China)

Abstract:Biochar is the product of biomass pyrolysis at high temperature in the absence or limitation of oxygen. At present, biochar is widely used in the agricultural field, which can improve soil quality and enhance soil carbon sink. The application of biochar will change physical, chemical and biological properties in soil and affect soil CO2 emission. In this paper, we reviewed the effects of biochar on soil CO2 emission from the perspectives of biochar properties, soil properties, and biochar stabilities. The main objectives were to investigate a) the biochar characteristics (pH, specific surface area, pore size, volatiles, and ash, etc.) derived from different carbonization temperatures and biomass sources on and their effects on soil CO2 emission, b) the changes of soil physicochemical properties in biochar-amended filed and their effects on soil CO2 emission, c) the stabilities of biochar and their effects on soil CO2 emission. Based on the above three aspects, this paper summarized the effects of biochar on soil CO2 emissions and prospected the carbon sequestration and mitigation of biochar. It is expected to provide guidance for biochar application and farmland carbon sequestration in the future.

Key words: Biochar; Stability, CO2 emission, Priming effect; Influencing factors

EARTH AND ENVIRONMENT Vol.49, No.1, Tot No.344, 2021, Page 726-736

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