Food for Thought: Lower-Than-Expected Crop Yield Stimulation with Rising CO 2 Concentrations
| Autor: | Donald R. Ort, Elizabeth A. Ainsworth, Stephen P. Long, Andrew D. B. Leakey, Josef Nösberger |
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| Rok vydání: | 2006 |
| Předmět: |
Crops
Agricultural Nitrogen Enclosure Climate change Poaceae Zea mays chemistry.chemical_compound Ozone Human fertilization Meta-Analysis as Topic Biomass Photosynthesis Fertilizers Water content Sorghum Triticum Multidisciplinary Atmosphere Crop yield Temperature Water Stimulating environment Carbon Dioxide chemistry Agronomy Carbon dioxide Environmental science Soybeans Forecasting Field conditions |
| Zdroj: | Science. 312:1918-1921 |
| ISSN: | 1095-9203 0036-8075 |
| DOI: | 10.1126/science.1114722 |
| Popis: | 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 ([CO 2 ]) will offset these losses. The CO 2 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 [CO 2 ] under fully open-air field conditions. In those trials, elevated [CO 2 ] enhanced yield by ∼50% less than in enclosure studies. This casts serious doubt on projections that rising [CO 2 ] will fully offset losses due to climate change. |
| Databáze: | OpenAIRE |
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