Differences in CH4 and N2O emissions between rice nurseries in Chinese major rice cropping areas

文献类型： 外文期刊

第一作者： Zhang, Yi

作者： Zhang, Yi;Jiang, Yu;Zhang, Mingqian;Zhang, Weijian;Li, Zhijie;Zhang, Xin;Deng, Aixing;Zhang, Weijian;Feng, Jinfei;Chen, Jin

作者机构：

关键词： Climate change;Greenhouse gas emissions;Global warming potential;Rice seedling nursery;Irrigation regime;Cropping systems

期刊名称：ATMOSPHERIC ENVIRONMENT （ 影响因子：4.798； 五年影响因子：5.295 ）

ISSN： 1352-2310

年卷期： 2014 年 96 卷

页码：

收录情况： SCI

摘要： Studies on greenhouse gas (GHG) emissions from paddy field have primarily focused on the post-transplanting period, however, recent researches raise new concerns about GHGs emission from rice nursery. In this study, CH4 and N2O fluxes were determined from different nurseries under major rice cropping systems in China. The tested nurseries included flooded nursery (FN), moist nursery (MN) and dry nursery (DN). Methane emissions from FN were significantly higher than those from MN and DN under all the rice cropping systems. When comparing with FN, MN decreased total CH4 emissions by 74.2%, 72.1% and 49.6% under the rice-upland rotation cropping system (RUR), and the double rice cropping system for the early rice (EDR) and the late rice (LDR), respectively. DN decreased CH4 emissions by 99.2%, 92.0%, 99.0% and 78.6% compared to FN under the single rice cropping system (SR), RUR, EDR and LDR, respectively. When comparing with FN, MN and DN increased N2O emissions by 58.1-134.1% and 28.2-332.7%, respectively. Ultimately, compared with FN across the cropping systems, MN and DN decreased net global warming potentials (GWPs) of CH4 and N2O by 33-68% and 43-86%, respectively. The mitigating effect of MN and ON on total GWPs varied greatly across the systems, ranging from 30.8% in the LDR to 86.5% in the SR. Chinese actual emission from rice nurseries was reduced to 956.66 x 10(3) t CO2 eq from the theoretical estimate of 2242.59 x 10(3) t CO2 eq if under the flooded nursery scenario in 2012. Taking into account the large rice nursery area (2032.52 x 10(3) ha) in China, the results of this study clearly indicate the importance to estimate and mitigate GHGs emission from flooded rice nursery. Being effective to reduce GHG emissions and increase rice yield, dry nursery technique is a promising candidate for climate smart rice cropping. (C) 2014 Elsevier Ltd. All rights reserved.

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