National Technical Reports Library

The National Technical Information Service acquires, indexes, abstracts, and archives the largest collection of U.S. government-sponsored technical reports in existence. The NTRL offers online, free and open access to these authenticated government technical reports. Technical reports and documents in its repository may be available online for free either from the issuing federal agency, the U.S. Government Publishing Office’s Federal Digital System website, or through search engines.

Details

Carbon Dioxide and Vegetation Water Use.

DE2002762782

Publication Date	2002
Personal Author	Ball, J. T.; Peterson, A. G.; Hoylman, A. M.; Luo, Y.; Sims, D. A.
Page Count	14
Abstract	Evapo-transpiration from vegetation, as well as patterns of precipitation are expected to change as the concentration of CO(sub 2) in the atmosphere continues to rise (f). Water modulates the rates of many biogeochemical processes, and it has been estimated that water directly limits plant productivity over two-thirds of the earth's land surface (2). Water quality and availability are increasingly important practical issues as demands by both agricultural and urban users continue to increase. In a recent Perspective article (3) Farquhar stated that transpiration (water loss) from terrestrial vegetation will decline by 40 to 50% as the CO(sub 2) concentration in the atmosphere approaches twice present levels. He suggested that ''the impending saving of water would be a welcome result of the rising atmospheric CO(sub 2) concentration.'' We can confirm that large reductions in transpiration are expected by terrestrial physiological ecologists. Examining 35 recent articles that discussed the issue of water use while synthesizing research on ecosystem impacts of doubling atmospheric CO(sub 2) (including reviews and crop/natural ecosystem models), we found that 31 articles suggest that reductions in water use of between 25 and 50% are to be expected.
Keywords	Carbon dioxide Transpiration Vegetation Water consumption Precipitation(Meteorology) Ecology Bioclimatology Greenhouse effect
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Desert Research Inst., Reno, NV.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200220

Carbon Dioxide and Vegetation Water Use.

Carbon Dioxide and Vegetation Water Use.
DE2002762782

Publication Date	2002
Personal Author	Ball, J. T.; Peterson, A. G.; Hoylman, A. M.; Luo, Y.; Sims, D. A.
Page Count	14
Abstract	Evapo-transpiration from vegetation, as well as patterns of precipitation are expected to change as the concentration of CO(sub 2) in the atmosphere continues to rise (f). Water modulates the rates of many biogeochemical processes, and it has been estimated that water directly limits plant productivity over two-thirds of the earth's land surface (2). Water quality and availability are increasingly important practical issues as demands by both agricultural and urban users continue to increase. In a recent Perspective article (3) Farquhar stated that transpiration (water loss) from terrestrial vegetation will decline by 40 to 50% as the CO(sub 2) concentration in the atmosphere approaches twice present levels. He suggested that ''the impending saving of water would be a welcome result of the rising atmospheric CO(sub 2) concentration.'' We can confirm that large reductions in transpiration are expected by terrestrial physiological ecologists. Examining 35 recent articles that discussed the issue of water use while synthesizing research on ecosystem impacts of doubling atmospheric CO(sub 2) (including reviews and crop/natural ecosystem models), we found that 31 articles suggest that reductions in water use of between 25 and 50% are to be expected.
Keywords	Carbon dioxide Transpiration Vegetation Water consumption Precipitation(Meteorology) Ecology Bioclimatology Greenhouse effect
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Desert Research Inst., Reno, NV.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200220