Maize yields crash past a hidden dryness tipping point
Wei D, Zhang Y, Zhao Y, Sun Q
Climate Adaptation
The corn in your summer garden bed doesn't fail gradually as the air dries out; it holds on fine until a specific dryness threshold, then yields drop off a cliff, which is exactly the kind of tipping point that makes drought planning so tricky.
Scientists tracked forty years of corn harvests across China and found something surprising: yields don't shrink gradually as the air gets drier. They stay pretty stable until the air's thirstiness crosses a specific tipping point, and after that, losses accelerate fast. Corn in northeast China is far more sensitive to this tipping point than corn in the North China Plain, and as the climate warms, farmers there will cross that line far more often, putting a much bigger dent in future harvests.
Key Findings
Maize yield response to Vapor Pressure Deficit (VPD) is nonlinear, with distinct thresholds: 0.82 kPa in Northeast China and 0.91 kPa in the North China Plain.
Beyond the threshold, Northeast China loses yield 2.4 times faster than the North China Plain (4.52 vs 1.88 Mg/ha per kPa), driven by tighter land-atmosphere coupling.
Under high-emissions climate scenarios (SSP5-8.5), the probability of crossing these thresholds rises to 54-86% in the NE and 48-85% in the NCP by late century, projecting yield losses up to 12.0% in the NE versus 6.18% in the NCP.
chevron_right Technical Summary
Chinese maize yields hold steady until the air gets thirsty enough to cross a hard threshold, then losses accelerate sharply, and climate change means that threshold will be crossed far more often, cutting future harvests by up to 12% in the hardest-hit northeast region.
Abstract Preview
Original paper
Nonlinear maize yield responses to drought drive escalating regional vulnerabilities under climate change in China.
Drought poses a growing threat to global maize production, with risks projected to intensify under climate change. However, comprehensive, long-term quantification of crop yield responses to drough...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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Maize, also known as corn in North American English, is a tall stout grass that produces cereal grain. The leafy stalk of the plant gives rise to male inflorescences or tassels which produce pollen, and female inflorescences called ears. The ears yield grain, known as kernels or seeds. In modern ...