A Comparison of Greenhouse Gas Emissions from a Paddy Field Following Incorporation of Rice Straw and Straw-Based Biochar
To evaluate the effects of straw-based biochar on greenhouse gas emissions from paddy fields,a field study was conducted on a typical paddy field in subtropical China to compare the greenhouse gas emissions induced by rice straw and straw-based biochar incorporation.The cumulative CH4 emissions were 281 to 515 kg CH4 ha-1 for the straw incorporation treatments,which were 2.6 to 6.4 times higher than with the biochar treatments.The cumulative N2(emissions were 75.7 to 135 g N2(ha-1,and there were no significant different between treatments.The calculated global warming potentials (GWPs) were 7,055 to 12,906 kg CO2-eq ha-1 for straw incorporation treatments,while those for the biochar incorporation treatments were only 1,776 to 2,004 kg CO2-eq ha-1.When divided by yield,the yield-scaled GWPs were 1,127 to 2,081 kg CO2-eq Mg-1,which were 2.0 to 7.0 times higher than those of the biochar treatments.The GWPs and yield-scaled GWPs of the greenhouse gases from the paddy field with straw-based biochar incorporation were much lower than with straw incorporation,indicating that the conversion of straw to straw based biochar can be an effective means of carbon sequestration in rice production and can even increase grain yields to some degree.However,the long-term effects of biochar incorporation in paddy fields need further study.
Methane (CH4) Nitrous oxide (N2O) Greenhouse gas emission Global warming potential
Jianlin Shen Hong Tang JieyunLiu Yong Li TidaGe Jinshui Wu
Key Laboratory of Agro-ecological Processes in Subtropical Region,Institute of Subtropical Agricultu Key Laboratory of Agro-ecological Processes in Subtropical Region,Institute of Subtropical Agricultu
国际会议
the 16th Meeting of the International Humic Substances Society (第十六届国际腐殖物质学会大会(IHSS 16))
杭州
英文
577-579
2012-09-09（万方平台首次上网日期，不代表论文的发表时间）