Response of rice production to elevated [CO 2 ] and its interaction with rising temperature or nitrogen supply: a meta-analysis

Jinyang Wang, Cong Wang, Nannan Chen, Zhengqin Xiong, David Wolfe and Jianwen Zou ()

Climatic Change, 2015, vol. 130, issue 4, 529-543

Abstract: We used meta-analysis to synthesize 125 studies assessing the responses of rice production to elevated atmospheric carbon dioxide concentration ([CO 2 ]), and the interaction of elevated [CO 2 ] with rising temperature or N supply. Elevated [CO 2 ] significantly enhanced rice yield by 20 %, despite no significant increase in grain size and harvest index at elevated [CO 2 ]. Belowground biomass increased at elevated [CO 2 ] to a larger extent than aboveground biomass. Among the Japonica, Indica and Hybrid rice cultivars, Hybrid cultivars generally showed the greatest growth response to elevated [CO 2 ]. The maximum enhancement of rice yield was observed at 600–699 ppm [CO 2 ] with less benefit in studies with lower or higher elevated [CO 2 ] levels. Rice yield responses to elevated [CO 2 ] were smaller in FACE compared with the other fumigation methods, largely associated with lower photosynthesis. Increases in rice yield at elevated [CO 2 ] were constrained by limited N supply. The detrimental effect of rising temperature on spikelet fertility and harvest index were not be fully counteracted by elevated [CO 2 ] effects. Together, the results of this meta-analysis suggest that rising [CO 2 ] and warming accompanied by low N supply are unlikely to stimulate rice production, especially with the current trajectory of emissions scenarios. Copyright Springer Science+Business Media Dordrecht 2015

Date: 2015
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DOI: 10.1007/s10584-015-1374-6

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