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| Emissions of Carbon Dioxide and Methane in Different Pig Biobeds |
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| KeyWord:biobed; material flow analysis; carbon transformation; carbon dioxide emission; methane emission |
| Author Name | Affiliation | | ZHANG Li-ping | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | SUN Guo-feng | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | SHENG Jing | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | CHEN Liu-gen | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | ZHENG Jian-chu | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China |
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| Abstract: |
| Biobed for pig raising is an eco-pig raising system with less wastes discharged into the environment. However, there is little information available about its impacts on greenhouse gas emission. In this study, we hypothesized that biobed materials with different compositions may have different effects on carbon dioxide and methane emissions. An experiment of multivariable completed block design with repeated measure and three replicates was conducted. Treatments consisted of three different bedding materials：rice husk+sawdust（FD）, rice husk+mushroom bran（FJ）, and rice husk+vinasse（FW）. Gases were sampled by static box method at different stages during one production cycle（150 days）. The total emissions of CO2 and CH4 accounted for 41.21%, 54.21% FD, and 48.27% of total carbon losses in FJ, FD, and FW, respectively. The pattern of CO2 emissions showed similarity among three bedding materials, which appeared emission peaks both at earlier and later stages of pig growth, with greater emissions at later than at earlier stage. The total amount of CO2 emitted was highest in FD, followed by FJ. The pattern of CH4 emission in FJ and FW was similar to that of CO2, but the amounts of CH4 emitted were similar at two peaks. However, the emission of CH4 in FD mainly concentrated at the earlier stage. The total amount of CH4 emission was largest in FW, followed by FJ. Correlation analysis showed that there was a negative correlation between CO2 and CH4 in the three biobeds, implying biological oxidation of CH4 into CO2. |
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