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| Annual CH4 Emission and Greenhouse Effects in Double Cropping Rice Fields with Different Rice Straw Returning Methods |
| Received:October 23, 2014 |
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| KeyWord:double cropping rice field;paddy soil;rice straw returning to soil;CH4 |
| Author Name | Affiliation | E-mail | | PENG Hua | Longping Branch of Graduate School of Central South University, Changsha 410125, China
Institute of Soil and Fertilizer, Hunan Academy of Agricultural Sciences, Changsha 410125, China
Ministry of Agriculture Key Laboratory of Agriculture Environment in Middle Reach Plain of Yangtze River, Changsha 410125, China | | | JI Xiong-hui | Institute of Soil and Fertilizer, Hunan Academy of Agricultural Sciences, Changsha 410125, China
Ministry of Agriculture Key Laboratory of Agriculture Environment in Middle Reach Plain of Yangtze River, Changsha 410125, China | jixionghui@sohu.com | | WU Jia-mei | Longping Branch of Graduate School of Central South University, Changsha 410125, China
Institute of Soil and Fertilizer, Hunan Academy of Agricultural Sciences, Changsha 410125, China
Ministry of Agriculture Key Laboratory of Agriculture Environment in Middle Reach Plain of Yangtze River, Changsha 410125, China | | | ZHU Jian | Longping Branch of Graduate School of Central South University, Changsha 410125, China
Institute of Soil and Fertilizer, Hunan Academy of Agricultural Sciences, Changsha 410125, China
Ministry of Agriculture Key Laboratory of Agriculture Environment in Middle Reach Plain of Yangtze River, Changsha 410125, China | | | HUANG Juan | Longping Branch of Graduate School of Central South University, Changsha 410125, China
Ministry of Agriculture Key Laboratory of Agriculture Environment in Middle Reach Plain of Yangtze River, Changsha 410125, China | |
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| Abstract: |
| Returning rice straw directly to soil may increase CH4 emissions from rice fields. However, it is unclear how different straw returning methods influence CH4 emissions. In this work, a static chamber-gas chromatography technique was used to investigate CH4 emissions from double cropping rice(Oryza sativa L.) fields with different rice straw returning methods with or without soil tillage, namely tillage without straw returning(CK), tillage with incinerated rice straw returning(BST), no-tillage with rice straw covering in the growing season and high stakes in winter fallow(SNTH), no-tillage with rice straw covering in growing season and buried rice straw in winter fallow(SNTB),and tillage with straw returning and buried straw in winter fallow(STB). Results showed that CH4 emissions from early rice and late rice seasons accounted for 43.9% and 52.1% of the annual total emissions, respectively, while only 4.0% of CH4 emissions was from winter fallow season. Straw soil returning increased the total annual CH4 emissions by 25.9%~92.8%(P<0.05), compared with the CK. The STB treatment produced less CH4 emissions than SNTH and SNTB did. The greenhouse effects of different treatments were STB>BST> SNTB>SNTH>CK. In conclusion, the greenhouse effects would be mitigated to some extent by straw covering and no-tillage in rice growth season or stubble or straw burying in winter fallow season compared to straw direct returning to soil. Therefore, SNTH and SNTB could effectively reduce the annual CH4 emission in double cropping rice system. |
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