Abstract
Rice is the staple food in China, and the country’s enlarging population puts increasing pressure on its rice production as well as on that of the world. In this study, we estimate the impact of climate change, CO2 fertilization, crop adaptation and the interactions of these three factors on the rice yields of China using model simulation with four hypothetical scenarios. According to the results of the model simulation, the rice yields without CO2 fertilization are predicted to decrease by 3.3 % in the 2040s. Considering a constant rice-growing season (GS), the rice yields are predicted to increase by 3.2 %. When the effect of CO2 fertilization is integrated into the Agro-C model, the expected rice yields increase by 20.9 %. When constant GS and CO2 fertilization are both integrated into the model, the predicted rice yield increases by 28.6 %. In summary, the rice yields in China are predicted to decrease in the 2040s by 0.22 t/ha due to climate change, to increase by 0.44 t/ha due to a constant GS and to increase by 1.65 t/ha due to CO2 fertilization. The benefits of crop adaptation would completely offset the negative impact of climate change. In the future, the most of the positive effects of climate change are expected to occur in northeastern and northwestern China, and the expansion of rice cultivation in northeastern China should further enhance the stability of rice production in China.


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Acknowledgments
This work was jointly supported by the Ministry of Science and Technology of China (Grant No. 2012CB417106 & 2010CB950604), the CAS Strategic Priority Research Program (Grant No. XDA05050507) and the National Natural Science Foundation of China (Grant No. 41321064).
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Table S1
Description of Agro-Ecological Zones in China (DOCX 26 kb)
Fig S2
The dynamics of climatic factors in different climatic scenarios from 2011 to 2050 (DOCX 145 kb)
Fig. S3
Temporal changes in the projected rice yields in various management and climate change scenarios in the next four decades. The baseline value is the average rice yield in S0 in the 2000s. The expected yields of (a) early rice in A2; (b) late rice in A2; (c) single rice in A2; (d) area-weighted rice in A2; (e) early rice in B2; (f) late rice in B2; (g) single rice in B2; and (h) area-weighted rice in B2 are based on the cultivated areas of each type of rice in 2010 (DOCX 515 kb)
Fig. S4
Temporal changes in the projected rice yields in various management scenarios in the next four decades. The baseline value is the average rice yield in S0 in the 2000s. The expected yields of (a) early rice; (b) late rice; (c) single rice; and (d) area-weighted rice are based on the cultivated areas of each type of rice in 2010 (DOCX 134 kb)
Fig. S5
Predicted rice yield changes and variations in the next four decades in different scenarios. The error bars represent the standard deviation of the yield in a given scenario for a given decade. The expected yields of (a) early rice; (b) late rice; (c) single rice; and (d) area-weighted rice are based on the cultivated areas of each type of rice in 2010 (DOCX 92 kb)
Fig. S6
Reduced growth duration in constant thermal time scenarios (S1 and S3) compared with that of the baseline scenario (S0). VG is the vegetative growth phase (from transplanting to heading), and RG is the reproductive growth phase (from heading to harvesting) (DOCX 579 kb)
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Yu, Y., Zhang, W. & Huang, Y. Impact assessment of climate change, carbon dioxide fertilization and constant growing season on rice yields in China. Climatic Change 124, 763–775 (2014). https://doi.org/10.1007/s10584-014-1129-9
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DOI: https://doi.org/10.1007/s10584-014-1129-9