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Aboveground morphological traits do not predict rice variety effects on CH4 emissions

文献类型： 外文期刊

作者： Zhang, Yi 1 ; Jiang, Yu 1 ; Li, Zhijie 2 ; Zhu, Xiangchen 2 ; Wang, Xiaofei 1 ; Chen, Jin 3 ; Hang, Xiaoning 1 ; Deng, Ai 1 ;

作者机构： 1.Nanjing Agr Univ, Inst Appl Ecol, Nanjing 210095, Jiangsu, Peoples R China

2.Chinese Acad Agr Sci, Key Lab Crop Physiol & Ecol, Minist Agr, Inst Crop Sci, Beijing 100081, Peoples R China

3.Jiangxi Acad Agr Sci, Soil & Fertilizer & Resources & Environm Inst, Nanchang 330200, Peo

关键词： Global warming;Greenhouse gas emission;Rice variety;Paddy field;Above- and belowground;Plant traits

期刊名称：AGRICULTURE ECOSYSTEMS & ENVIRONMENT （ 影响因子：5.567； 五年影响因子：6.064 ）

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收录情况： SCI

摘要： High-yield varieties with low methane emissions will benefit sustainable rice (Oryza sativa L.) production. However, no specific plant characteristics have been identified to be primarily responsible for rice variety impacts on the CH4 emission. We conducted a comprehensive study through comparing effects of 66 varieties on CH4 under both greenhouse and field conditions to identify rice plant characteristics that may significantly affect soil CH4 emission. Although there were significant differences in CH4 emissions among the tested rice varieties, no significant and consistent relationships were observed between aboveground traits and CH4 fluxes or dissolved CH4 concentrations in soil solutions. Yet dissolved CH4 concentrations were significantly correlated with the mean CH4 flux over the growing season. In addition, cutting rice plants 5 cm off above the floodwater did not increase CH4 fluxes, indicating that the CH4 transport through the removed part of rice plant contributed little to the total CH4 emission. Taken together, our results indicate that differences in CH4 emissions among rice varieties primarily stem from the differential effects of rice plants on the belowground CH4 production and oxidation. Aboveground plant traits do not provide reliable predictions of variety effects on CH4 emissions. Future efforts should be focused on understanding belowground processes and the underlying mechanisms that govern rice variety impacts on the CH4 emission. (C) 2015 Elsevier B.V. All rights reserved.

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