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Consistent negative response of US crops to high temperatures in observations and crop models

By Bernhard Schauberger, Sotirios Archontoulis, Almut Arneth, Juraj Balkovic, Philippe Ciais, Delphine Deryng, Joshua Elliott, Christian Folberth, Nikolay Khabarov, Christoph Müller, Thomas A.M. Pugh, Susanne Rolinski, Sibyll Schaphoff, Erwin Schmid, Xuhui Wang, Wolfram Schlenker and Katja Frieler

Abstract

High temperatures are detrimental to crop yields and could lead to global warming-driven reductions in agricultural productivity. To assess future threats, the majority of studies used process-based crop models, but their ability to represent effects of high temperature has been questioned. Here we show that an ensemble of nine crop models reproduces the observed average temperature responses of US maize, soybean and wheat yields. Each day 430 C diminishes maize and soybean yields by up to 6% under rainfed conditions. Declines observed in irrigated areas, or simulated assuming full irrigation, are weak. This supports the hypothesis that water stress induced by high temperatures causes the decline. For wheat a negative response to high temperature is neither observed nor simulated under historical conditions, since critical temperatures are rarely exceeded during the growing season. In the future, yields are modelled to decline for all three crops at temperatures 430 C. Elevated CO2 can only weakly reduce these yield losses, in contrast to irrigation.Peer Reviewe

Topics: 630 Landwirtschaft und verwandte Bereiche, ddc:630
Publisher: Humboldt-Universität zu Berlin
Year: 2017
DOI identifier: 10.1038/ncomms13931
OAI identifier: oai:edoc.hu-berlin.de:18452/19585
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