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| Short-term greenhouse gas emissions from organic and conventional rice-wheat rotation cropping systems in Taihu Lake region, China |
| Received:June 05, 2019 |
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| KeyWord:rice-wheat rotation;organic cropping;greenhouse gas;global warming potential;emission intensity |
| Author Name | Affiliation | E-mail | | CHEN Qiu-hui | Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China
Organic Food Development Center, Ministry of Ecology and Environment, Nanjing 210042, China | | | WANG Lei | Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China
Organic Food Development Center, Ministry of Ecology and Environment, Nanjing 210042, China | | | XI Yun-guan | Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China
Organic Food Development Center, Ministry of Ecology and Environment, Nanjing 210042, China | xygofrcc@126.com | | TIAN Wei | Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China
Organic Food Development Center, Ministry of Ecology and Environment, Nanjing 210042, China | | | JIN Shu | Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China
Organic Food Development Center, Ministry of Ecology and Environment, Nanjing 210042, China | | | ZHANG Chi | Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China
Organic Food Development Center, Ministry of Ecology and Environment, Nanjing 210042, China | | | LI Yan | Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China
Organic Food Development Center, Ministry of Ecology and Environment, Nanjing 210042, China | | | XIAO Xing-ji | Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China
Organic Food Development Center, Ministry of Ecology and Environment, Nanjing 210042, China | |
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| Abstract: |
| To evaluate the impact of organic cropping system on global warming, a field experiment on greenhouse gas(GHG) emissions from organic and conventional rice-wheat rotation cropping systems was conducted in Taihu Lake region. Greenhouse gases CO2, CH4, and N2O emission fluxes were measured using the static chamber-gas chromatograph method. Greenhouse warming potential(GWP) and greenhouse gas intensity(GHGI) were also used to analyze their warming effects. The results showed that the character of CO2, CH4, and N2O emissions flux dynamics were almost the same for organic and conventional rice-wheat rotation systems. The amount of CH4 emission from organic rice paddy field was 195.56 kg·hm-2, significantly greater than conventional field(119.77 kg·hm-2), whereas no significant differences were observed for CO2 and N2O emissions. Further, CO2, N2O, and CH4 emissions were 8 096.61, 2.67, and 6.74 kg·hm-2, respectively, from conventional wheat field and 12 554.92, 1.44, and 7.02 kg·hm-2 respectively from organic field. GWP and GHGI of organic field in rice season were significantly higher than those of conventional field, but contrarily in wheat season. GWP and GHGI of organic rice-wheat rotation field were 6 501.69 kg CO2-eq·hm-2 and 0.44 kg·kg-1 respectively, significantly higher than those from convention field(4 745.38 kg CO2-eq·hm-2 and 0.37 kg·kg-1 respectively). The results suggest that organic cropping system may not be an effective way to reduce greenhouse gas emissions in rice paddy ecosystem, but is effective in mitigating greenhouse gas emissions in wheat fields. |
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