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《Chinese Journal of Ecology》 2013-09
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Effects of pyrolysis temperature and duration time on pH,carbon and nitrogen contents of biochars produced from three crop residues

ZHANG Qian-feng;MENG Jun;LIU Ju-dong;WANG Guang-hua;Key Laboratory of Mollisols Agroecology,Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences;University of Chinese Academy of Sciences;Liaoning Biochar Engineering & Technology Research Center,Shenyang Agricultural University;  
The physical and chemical properties of biochar are mainly determined by matrix materials and pyrolysis conditions.Taking the corn cob,soybean stalk,and rice husk as test materials,and by using muffle furnace,this paper studied the effects of pyrolysis temperature(300,400,450,500,and 550 ℃) and pyrolysis duration(3,6,and 9 hours) on the biochar yield,its pH,and carbon and nitrogen contents.With the increase of pyrolysis temperature and duration,the biochar yield decreased,while the biochar pH increased.The carbon content of the biochar produced from corn cob and soybean stalk increased with the increase of pyrolysis temperature and duration,while that of the biochar produced from rice husk had less change.The nitrogen content of the biochar produced from soybean stalk decreased with the increase of pyrolysis temperature and duration,while that of the biochar produced from corn cob and rice husk had no regular change.
【Fund】: 黑龙江省杰出青年科学基金项目(JC201116);; 黑龙江省科技攻关项目(GC12B104);; 公益性行业(农业)科研专项经费项目(201303095)资助
【CateGory Index】: X705
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