热解条件对生物炭性质的影响以及生物炭对土壤碳矿化和固定的作用研究（英文）

【作者】 刘锐佳； 刘桂建； 胡若愚；

【机构】 中国科学技术大学地球和空间科学学院；

【摘要】 The influences of pyrolysis conditions on the products yield and characteristics of biochar derived from peanut shell were investigated in this study.The pyrolysis conditions included the pyrolysis temperature（300-700℃）,retention time（15-90 min）,heating rate(1-10℃ min^-1),gas flow rate(20-200 mL min^-1) and feedstock particle size（<0.075,0.075-0.150,0.150-0.300 and0.300-2.00 mm）.The results demonstrated that the temperature predominantly regulated the product yields distribution and characteristics of produced biochar.Furthermore,the heating rate considerably influenced the biochar proximate composition,micropore surface area and pore size.Particle size had significant influences on biochar surface porosity and bio-oil yield.Furthermore,biochar is considered to be an effective tool to mitigate global warming by long-term C-sequestration in soil and to influence C-mineralization via priming effects.The results show that immediately after application,BC suppresses and then increases C-mineralization,causing a loss of carbon over 1-120 days.According to the residual carbon and δ¹³C signature of postexperimental soil carbon,biochar-C significantly increased（P <0.05） the soil carbon stock by carbon sequestration in soil.更多还原

【Abstract】 The influences of pyrolysis conditions on the products yield and characteristics of biochar derived from peanut shell were investigated in this study.The pyrolysis conditions included the pyrolysis temperature（300-700℃）,retention time（15-90 min）,heating rate(1-10℃ min^-1),gas flow rate(20-200 mL min^-1) and feedstock particle size（<0.075,0.075-0.150,0.150-0.300 and0.300-2.00 mm）.The results demonstrated that the temperature predominantly regulated the product yields distribution and characteristics of produced biochar.Furthermore,the heating rate considerably influenced the biochar proximate composition,micropore surface area and pore size.Particle size had significant influences on biochar surface porosity and bio-oil yield.Furthermore,biochar is considered to be an effective tool to mitigate global warming by long-term C-sequestration in soil and to influence C-mineralization via priming effects.The results show that immediately after application,BC suppresses and then increases C-mineralization,causing a loss of carbon over 1-120 days.According to the residual carbon and δ¹³C signature of postexperimental soil carbon,biochar-C significantly increased（P <0.05） the soil carbon stock by carbon sequestration in soil.更多还原