Regional disparities in the beneficial effects of rising CO2 concentrations on crop water productivity

Deryng D, Elliott J, Folberth C, Müller C, Pugh TAM, Boote KJ, Conway D, Ruane AC, et al. (2016). Regional disparities in the beneficial effects of rising CO2 concentrations on crop water productivity. Nature Climate Change 6 (4): 1-8. DOI:10.1038/NCLIMATE2995.

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Project: Earth system Model Bias Reduction and assessing Abrupt Climate change (EMBRACE, FP7 282672)

Abstract

Rising atmospheric CO2 concentrations ([CO2]) are expected to enhance photosynthesis and reduce crop water use1. However, there is high uncertainty about the global implications of these effects for future crop production and agricultural water requirements under climate change. Here we combine results from networks of field experiments1, 2 and global crop models3 to present a spatially explicit global perspective on crop water productivity (CWP, the ratio of crop yield to evapotranspiration) for wheat, maize, rice and soybean under elevated [CO2] and associated climate change projected for a high-end greenhouse gas emissions scenario. We find CO2 effects increase global CWP by 10[0;47]%–27[7;37]% (median[interquartile range] across the model ensemble) by the 2080s depending on crop types, with particularly large increases in arid regions (by up to 48[25;56]% for rainfed wheat). If realized in the fields, the effects of elevated [CO2] could considerably mitigate global yield losses whilst reducing agricultural consumptive water use (4–17%). We identify regional disparities driven by differences in growing conditions across agro-ecosystems that could have implications for increasing food production without compromising water security. Finally, our results demonstrate the need to expand field experiments and encourage greater consistency in modelling the effects of rising [CO2] across crop and hydrological modelling communities.

Item Type: Article
Uncontrolled Keywords: Agriculture; Climate Change Impacts; Water Resources
Research Programs: Ecosystems Services and Management (ESM)
Depositing User: Luke Kirwan
Date Deposited: 22 Apr 2016 06:54
Last Modified: 27 Mar 2017 14:00
URI: http://pure.iiasa.ac.at/12884

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