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| Greenhouse gases emission from paddy fields under different rice straw treatments |
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Abstract A field experiment was conducted in double rice area to figure out the influence of different rice straw treatments (rice straw removing +NPK, rice straw incorporated into the soil(RS)+NPK, rice straw burned in situ(BIS)+NPK) on the greenhouse gases emission from paddy fields. The results showed that RS+NPK treatment increased the CH4 emission and decreased the N2O emission significantly compared with NPK treatment, while BIS+NPK treatment reduced CH4 and N2O emission during the double rice growing season. N2O emission of RS+NPK and BIS+NPK treatments had no significant difference. CH4 emission from burning activity was equivalent to that from rice field, while N2O emission accounted for a great proportion of total N2O emission during the growing period, 90.1% and 53.4%, respectively. The total GHG emission of different treatment is RS+NPK>NPK>BIS+NPK. A similar order was found for emission intensity (CO2 e/t grain yield).
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Received: 30 August 2011
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