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 2, NUMBER 2, FEBRUARY 1989
"The Response of Annuals in Competitive Neighborhoods: Effects of
Elevated CO2," F.A. Bazzaz (Dept. Evolutionary Biol., Harvard Univ.,
Cambridge MA 02138), K. Garbutt, Ecol., 69(4), 937-946, Aug.
In this laboratory study, four species from an annual plant community were
used to investigate the effects of increased CO2 concentration and changing
neighborhood complexity on performance of individuals and competitive outcome.
Some species had increased biomass with increased CO2, while others had
decreased biomass. There were clear differences in species behavior in different
competitive mixtures as assessed by total biomass, seed biomass, and by an index
of response to neighbors. Strong statistical interactions between CO2 and the
identity of the competing species in mixtures were found to be primarily due to
the as yet unexplained response of plants with CO2 at 500 micro L/L.
"Estimating the Consequences of CO2-Induced Climatic Change on North
American Grain Agriculture Using General Circulation Model Information,"
D.S. Wilks (Dept. Agronomy, Cornell Univ., Ithaca NY 14853), Climatic Change,
13(1), 19-42, Aug. 1988.
Illustrates a procedure to estimate the potential climatic effects of
doubling CO2 on agriculture combining general circulation models (GCMs) and
process-oriented crop models. Specific agronomic predictions are found to depend
critically on the details of the projected climate change. Uncertainties in the
specification of the doubled-CO2 climate by the GCM, particularly with respect
to precipitation, dictate that agricultural predictions can only illustrate the
impact assessment method at this time.
"Repercussions of a CO2 Doubling on the Water Cycle and on the Water
Balance--A Case Study For Belgium," F. Bultot (Hydrology Section, Inst.
Royal Meteorologique de Belgique, Brussels, Belgium), A. Coppens et al.,
J. Hydrology, 99(3/4), 319-347, May 30, 1988.
Three drainage basins in Belgium were used to test a hydrological model for
present day climatic conditions and a doubling of CO2 over an eighty-year
period. Common responses of the three catchments were a strengthening of the
potential and effective evapotranspiration throughout the year, increased
frequency of daily values of the soil aeration zone water content below 60% or
40% of its capacity at saturation, and shortening of spells with snow cover. In
catchments with more surface flow there was an increase in flood frequencies
during winter months, a decrease in streamflow during the summer season, and
possible restraints, in summer and autumn, on water supply from local
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