February 28, 2007
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Global Climate Change Digest
A Guide to Information on Greenhouse Gases and Ozone Depletion
Published July 1988 through June 1999
FROM VOLUME 12, NUMBER 3, MARCH 1999
Potential Effects of Differential Day-Night Warming in Global
Climate Change on Crop Production, G. B. Dhakhwa and C. L. Campbell,Climatic
Change 40, 647-667 (1998).
GCMs and a plant-process model were used to study the effects of
asymmetric climate change (where average nighttime temperatures rise more
than daytime ones) on crop productivity. The model results indicated that
the effects of asymmetric warming may be less severe than the effects of
Climate Change Impacts on the Potential Productivity of Corn and
Winter Wheat in their Primary United States Growing Regions, R. A.
Brown and N. J. Rosenberg,Climatic Change 40, 73-107
GCMs and plant-process models were used to assess the crop responses of
dryland winter wheat and corn in the major U.S. production regions to
increases in temperature and CO2 concentration. Increasing the
global mean temperature 1° C decreased wheat and corn production only
marginally. Temperature increases of 2.5 and 5.0° C were also modeled
and, in the various models employed, produced wheat-production declines
ranging from 36 to 76% and lesser corn-production declines. Increases in
CO2 concentration had positive effects on both wheat and corn
production (an 18 to 29% increase for wheat and a 2 to 5% increase for
corn) with no temperature increases, but did not keep up with the declines
when combined with higher temperatures.
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