Evapotranspiration Responses of Plants and Crops to Carbon Dioxide and Temperature
| Autor: | L. H. Allen |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Carbon dioxide in Earth's atmosphere
Stomatal conductance Ecology Vapor pressure fungi Vapour pressure of water food and beverages Plant Science Applied Microbiology and Biotechnology chemistry.chemical_compound chemistry Agronomy Evapotranspiration Carbon dioxide Environmental science Water-use efficiency Agronomy and Crop Science Biotechnology Transpiration |
| Zdroj: | Journal of Crop Production. 2:37-70 |
| ISSN: | 1092-678X |
| DOI: | 10.1300/j144v02n02_02 |
| Popis: | Summary Atmospheric carbon dioxide (CO2) concentration has risen from about 270 mmol (CO2) mol−1 (air) (i.e., mole fraction of dry atmospheric air basis) before 1700 to about 370 mmol mol −1 currently. General Circulation Models (GCM) have predicted a global temperature rise of 2.8 to 5.2°C for a doubling of CO2. This review examines evapotranspiration and water-use efficiency responses of plants to rising CO2 and climatic changes, especially temperature. Doubling of CO2 will decrease leaf stomatal conductance to water vapor about 40%. However, water use by C3 crop plants under field conditions has usually been decreased only 12% or less for two reasons. Firstly, feedbacks in the energy balance of plant foliage cause leaf temperatures to rise as stomatal conductance is decreased. Increases of leaf temperature raise the vapor pressure of water inside the leaf, which increases the leaf-to-air vapor pressure difference. This increased driving force for transpiration offsets in large part the decreased leaf c... |
| Databáze: | OpenAIRE |
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