Improved Estimates of Regional Rice Yield Responses to Elevated CO2 by Considering Sub-Species Discrepancies
Wang, Songhan (Nanjing Agricultural University)
van Groenigen, Kees Jan (University of Exeter. Department of Geography)
Müller, Christoph (Potsdam Institute for Climate Impact Research)
Wang, Xuhui (Peking University. Sino-French Institute for Earth System Science)
Song, Lian (Chinese Academy of Sciences. Institute of Soil Science)
Liu, Yunlong (Nanjing Agricultural University)
Jiang, Yu (Nanjing Agricultural University)
Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Ding, Yanfeng (Nanjing Agricultural University)

Data:	2025
Resum:	Increased rice yields due to rising atmospheric carbon dioxide (CO2), known as the CO2 fertilization effect (CFE), is one of several important factors sustaining global food security. However, model projections on future rice yields are still largely uncertain, partly owing to the lack of how CFE varies between rice species. Here, through synthesis of hundreds of field observations, we found the experimental evidence of a 12. 8 ± 0. 8% yield increase per 100 ppm CO2 increase for Indica, but only about a half for Japonica (6. 3 ± 0. 5 %). After accounting for differences in sub-species, crop model projections showed substantial regional discrepancies of CFE, which are not captured by original models. More importantly, the spatial and temporal variations of rice yield were projected more accurately after considering this sub-species difference. Together, these results suggest strong influences of genotype on rice yield responses to CO2 and highlight the need for crop models to consider genotypes for improving projections of global crop yield.
Ajuts:	Agencia Estatal de Investigación PID2019-110521GB-I00 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-1005
Nota:	Altres ajuts: the Fundación Ramón Areces grant CIVP20A6621
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Llengua:	Anglès
Document:	Article ; recerca ; Versió sotmesa a revisió
Matèria:	Global crop yield ; Rice yield ; CO2 fertilisation effect ; Rice sub-species ; Crop models
Publicat a:	Journal of geophysical research. Biogeosciences, Vol. 130, Issue 3 (March 2025) , art. e2024JG008438, ISSN 2169-8961

DOI: 10.1029/2024JG008438

Preprint 25 p, 1.0 MB

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