Ecology of crops in changing CO2 concentration
1993
Kimball, Bruce A.
Under non-limiting water and nutrient supply, prior reviews suggest crops grow about 30% more on the average with a doubling of CO2 concentration. Reports indicate that water-limiting conditions increase the stimulation of growth by elevated CO2 more often than they decrease it, but a regression analysis did not reveal significant differences. In contrast, other reports suggest nutrient-limited conditions reduce stimulation of growth by CO2 enrichment more often than they increase it. Regression analysis of these literature data suggests that on average the CO2 growth and yield stimulation under nutrient stress were only 74% and 49%, respectively, of the stimulation with adequate nutrients. However, many of the studies were pot or nutrient solution studies which may not represent field conditions. The interaction between CO2 and temperature appears to be strong and positive, although deleterious effects on harvest index may occur for some species, and increased temperature can shorten he life cycle of determinant crops.
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