Details

Autor(en) / Beteiligte

• Long, Stephen P
• Ainsworth, Elizabeth A
• Leakey, Andrew D.B
• Nösberger, Josef
• Ort, Donald R

Titel

Food for Thought: Lower-Than-Expected Crop Yield Stimulation with Rising CO₂ Concentrations

Ist Teil von

• Science (American Association for the Advancement of Science), 2006-06, Vol.312 (5782), p.1918-1921

Ort / Verlag

Washington, DC: American Association for the Advancement of Science

Erscheinungsjahr

2006

Quelle

American Association for the Advancement of Science

Beschreibungen/Notizen

• 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.