Food for thought: Lower-than-expected crop yield stimulation with rising CO2 concentrations

Research output: Contribution to journalArticle

Abstract

Model projections suggest that although increased temperature and decreased soil moisture will act to reduce global crop yields by 2050, the direct fertilization effect of rising carbon dioxide concentration ([CO2]) will offset these losses. The CO2 fertilization factors used in models to project future yields were derived from enclosure studies conducted approximately 20 years ago. Free-air concentration enrichment (FACE) technology has now facilitated large-scale trials of the major grain crops at elevated [CO2] under fully open-air field conditions. In those trials, elevated [CO2] enhanced yield by ∼50% less than in enclosure studies. This casts serious doubt on projections that rising [CO2] will fully offset losses due to climate change.

Original languageEnglish (US)
Pages (from-to)1918-1921
Number of pages4
JournalScience
Volume312
Issue number5782
DOIs
StatePublished - Jun 30 2006

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Fertilization
Climate Change
Carbon Dioxide
Soil
Air
Technology
Temperature

ASJC Scopus subject areas

  • General

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Food for thought : Lower-than-expected crop yield stimulation with rising CO2 concentrations. / Long, Stephen P.; Ainsworth, Elizabeth A.; Leakey, Andrew D.B.; Nösbsrger, Josef; Ort, Donald R.

In: Science, Vol. 312, No. 5782, 30.06.2006, p. 1918-1921.

Research output: Contribution to journalArticle

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