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Interactions of CO{sub 2} with temperature and other climate variables [electronic resource] : response of vegetation. Final report

Published:
Washington, D.C. : United States. Dept. of Energy. Office of Energy Research, 1995.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:
59 pages : digital, PDF file
Additional Creators:
United States. Department of Agriculture, United States. Department of Energy. Office of Energy Research, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary:
The overall objectives of this project were: (1) to examine experimentally, for major crop species, the interacting effects of CO₂ concentration, temperature, and water availability on plant growth and development, (2) to model these interactions, and (3) to continue developing physiologically-based mechanistic models for predicting crop response to increased CO₂ concentration and future global climate change. To meet these objectives, controlled-environment studies were conducted on cotton, lemon, rice, and soybean and a long-term open-top chamber study was continued on orange. Much progress was made on development of plant growth models for cotton, wheat, rice, and soybean. In addition, there were two special modeling efforts which have the potential for contributing to all of the crop models. These efforts are concerned with modeling root growth and physical and chemical processes in soil and with modeling the effect of stomatal aperture on photosynthesis and transpiration rates as a function of CO₂ concentration, temperature, and vapor pressure deficit. The root growth and soil process modeling is important because it enables us to estimate the water available to the plant. The modeling of effects of stomatal aperture on photosynthesis and transpiration rates enables them to estimate dry weight gain and water use by the plant. These are both important components of the interaction of CO₂ concentration with temperature and water availability. The work on stomatal aperture, photosynthesis, and transpiration has the added benefit of allowing us to improve predictions of energy partitioning by the terrestrial biosphere. The lack of realistic energy partitioning is a serious deficiency of the present general circulation models which are used to predict how climate will change. An additional important aspect of the rice experiments is a study of methane emissions of paddy-grown (i.e., flooded) rice grown under two levels of CO₂ and three temperature regimes.
Report Numbers:
E 1.99:6635
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Note:
Published through SciTech Connect.
02/28/1995.
Knipling, E.B.
US Water Conservation Laboratory (USWCL)
Western Cotton Research Laboratory (WCRL)
Univ. of Florida (UF)
Systems Research Laboratory (SRL)
Type of Report and Period Covered Note:
Final; 02/28/1995 - 02/28/1995
Funding Information:
AI02-93ER61720
View MARC record | catkey: 14139780