Dynamic Emission of CH4 from a Rice-Duck Farming Ecosystem
Jia-En Zhang, Ying Ouyang, Zhao-Xiang Huang, Guo-Ming Quan
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DOI: 10.4236/jep.2011.25062   PDF    HTML     5,105 Downloads   9,099 Views   Citations

Abstract

Global climatic change induced by emissions of greenhouse gases from human activities is an issue of increasing in-ternational environmental concerns, and agricultural practices and managements are the important contributors for such emissions. This study investigated dynamic emission of methane (CH4) from a paddy field in a rice-duck farming ecosystem. Three different cultivation treatments, namely the organic fertilizer + duck (OF+D), chemical fertilizer + duck (CF + D), and chemical fertilizer (Control) treatments, were employed in this study. Experimental data showed that hourly variations of CH4 emission from the paddy field during the day were somewhat positively correlated (R2 = 0.7 for the OF + D treatment and R2 = 0.6 for the CF+D treatment) to the hourly changes in air temperatures in addi-tion to the influences of the duck activities. The rate of CH4 emission for the CF+D treatment was higher than that of the Control treatment at the tillering stage, whereas the opposite was true at the heading stage. In contrary, the rate of CH4 emission for the OF + D treatment was always higher than that of the Control treatment regardless the tillering or heading stage. Our study revealed that the rate of CH4 emission depended not only on air temperature but also on the rice growth stage. A 6.7% increase in CH4 emission and in global warming potential (GWP) was observed for the CF + D treatment as compared to the Control treatment. This study suggested that although the impacts of duckling on the emission of CH4 depended on the rice growth stage and air temperature regime, the introduction of ducks into the rice farming system in general mitigated the overall CH4 emission and thereby the GWP.

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J. Zhang, Y. Ouyang, Z. Huang and G. Quan, "Dynamic Emission of CH4 from a Rice-Duck Farming Ecosystem," Journal of Environmental Protection, Vol. 2 No. 5, 2011, pp. 537-544. doi: 10.4236/jep.2011.25062.

Conflicts of Interest

The authors declare no conflicts of interest.

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