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Providing Insight
Into Climate Change
CO2 and Plant Growth
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9 Articles

Tree and Forest Functioning in an Enriched CO2 Atmosphere

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This abstract shows that elevated levels of atmospheric CO2 causes a long-term biomass increase of 130% for conifer trees and 49% for deciduous trees in studies not involving stress components. However, stimulation of photosynthesis by elevated CO2 in long-term studies was similar for conifers (62 %) and deciduous trees (53 %).

Happy Holidays, Thanks to CO2

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This World Climate Report discusses the results of three recent studies that investigated the effects of elevated atmospheric CO2 on sugarcane and pine trees. Doubled CO2 levels increased the sugarcan leaf area by over 30 percent, while the all important juice from the main stem increased a whopping 83%. Hundred of articles have already shown that pine trees will grow larger, more resistant to drought and other stresses, and more water-use efficient thanks to elevated atmospheric CO2. Shannon LaDeau and James Clark of Duke University examined results from a 13-year old loblolly pine plantation in the Duke Forest of North Carolina. They conclude "We found that trees growing under elevated CO2 matured earlier and produced more seeds and cones per unit basal area than ambient grown trees."

The Effect of Long-term Atmospheric CO2 Enrichment on the Intrinsic Water-use Efficiency of Sour Orange Trees

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This study evaluated the water use efficiency of orange trees at Phoenix, Arizona in response to elevated atmospheric CO2. The trees increased their water-use efficiency by 80% in response to a 300 ppmv increase in CO2, which is identical to the long-term CO2-induced increase in the trees' production of wood and fruit biomass. This suggests there could be little to no change in total water-use as trees' productivity increases with the air's CO2 content .

In Praise of CO2

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Lawrence Solomon shows that increasing CO2 in the atmosphere has caused the Earth's biomass to significantly increase. The planet is the greenest it's been in decades, thanks to man-made CO2 emissions!

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