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| Greenhouse Gas Emissions from Bio-bed Pig Raising Units with Different Bedding Materials |
| Received:May 04, 2015 |
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| KeyWord:bio-bed;greenhouse gases;straw |
| Author Name | Affiliation | E-mail | | WEI Si-yu | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China | | | LI Jian-hui | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China | | | LIU Shu-tong | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China | | | GUO Hai-ning | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China | | | MA Han | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China | | | YIN Wei-qin | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China | | | WANG Xiao-zhi | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China | xzwang@yzu.edu.cn | | FENG Ke | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China | |
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| Abstract: |
| Bio-bed pig-raising is a new pig-raising technique, and is drawing increasing interests. However, the impact of this new system on greenhouse gas emissions is poorly understood. In this study, greenhouse gas(CO2, CH4 and N2O) emissions were monitored in pig units three bedding materials, including sawdust(S), sawdust + rice husk(SR) and sawdust + rice husk + straw(SRS), in Liuhe Bio-bed pig farms, Nanjing. The physical and chemical properties of bedding materials(pH, moisture, ammonium and nitrate) were also measured during the experimental period. Results showed that CO2 and N2O were the main greenhouse gases, both accounting for 99.3%~99.6% of the total greenhouse gas emissions. The emissions of N2O mainly occurred during the last one month of the feeding period, accounting for 61% ~68% of the total N2O emission amount. The total CO2 and N2O emissions during the experimental period were not significantly different(P >0.05), while CH4 emissions were significantly different (P <0.01) among three materials. The largest CH4 emissions occurred in SRS treatment(18.60 g·m-2), followed by S treatment(8.10 g·m-2) and SR treatment(7.57g·m-2). Carbon dioxide equivalent emissions were higher in SRS than in S and SR, while the carbon dioxide equivalent emissions were not significantly different(P <0.05) between S and SR. In addition, the carbon dioxide equivalent emissions per unit area were not significantly different in three beds during the experimental period(P >0.05). The mechanisms of the differences in three greenhouse gas emissions in the three treatments were also discussed. |
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