Global crop yield response to extreme heat stress under multiple climate change futures

Deryng, Delphine, Conway, Declan ORCID: 0000-0002-4590-6733, Ramankutty, Navin, Price, Jeff and Warren, Rachel (2014) Global crop yield response to extreme heat stress under multiple climate change futures. Environmental Research Letters, 9 (3). 034011. ISSN 1748-9326

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Abstract

Extreme heat stress during the crop reproductive period can be critical for crop productivity. Projected changes in the frequency and severity of extreme climatic events are expected to negatively impact crop yields and global food production. This study applies the global crop model PEGASUS to quantify, for the first time at the global scale, impacts of extreme heat stress on maize, spring wheat and soybean yields resulting from 72 climate change scenarios for the 21st century. Our results project maize to face progressively worse impacts under a range of RCPs but spring wheat and soybean to improve globally through to the 2080s due to CO2 fertilization effects, even though parts of the tropic and sub-tropic regions could face substantial yield declines. We find extreme heat stress at anthesis (HSA) by the 2080s (relative to the 1980s) under RCP 8.5, taking into account CO2 fertilization effects, could double global losses of maize yield (ΔY = −12.8 ± 6.7% versus − 7.0 ± 5.3% without HSA), reduce projected gains in spring wheat yield by half (ΔY = 34.3 ± 13.5% versus 72.0 ± 10.9% without HSA) and in soybean yield by a quarter (ΔY = 15.3 ± 26.5% versus 20.4 ± 22.1% without HSA). The range reflects uncertainty due to differences between climate model scenarios; soybean exhibits both positive and negative impacts, maize is generally negative and spring wheat generally positive. Furthermore, when assuming CO2 fertilization effects to be negligible, we observe drastic climate mitigation policy as in RCP 2.6 could avoid more than 80% of the global average yield losses otherwise expected by the 2080s under RCP 8.5. We show large disparities in climate impacts across regions and find extreme heat stress adversely affects major producing regions and lower income countries.

Item Type:	Article
Official URL:	http://iopscience.iop.org/1748-9326/
Additional Information:	© 2014 IOP Publishing Ltd
Divisions:	Grantham Research Institute
Subjects:	G Geography. Anthropology. Recreation > GE Environmental Sciences S Agriculture > SB Plant culture
Date Deposited:	25 Apr 2014 09:54
Last Modified:	14 Apr 2024 06:36
Projects:	FP7-ENV-2010.4.2.1-1
Funders:	European Commission, Tyndall Centre for Climate Change Research, Natural Sciences and Engineering Research Council (NSERC) of Canada, Natural Environment Research Council of the United Kingdom, ERMITAGE project
URI:	http://eprints.lse.ac.uk/id/eprint/56568

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