Percent Dry Weight (Biomass) Increases for
300, 600 and 900 ppm Increases in the Air's CO2 Concentration:

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Duke Forest Ecosystem: Dominated by Pinus taeda L. (Loblolly Pine), with Liquidamber styraciflua L. (Sweetgum), Liriodendron tulipifera L. (Yellow Poplar) and other trees, shrubs and vines

300 ppm
600 ppm
900 ppm
 Number of Results
 Arithmetic Mean
 Standard Error

Individual Experiment Results

Journal References

Experimental Conditions
300 ppm
600 ppm
900 ppm

Hamilton et al. (2002)

two years into FACE study on soils of "low nitrogen and phosphorus availability"



McCarthy et al. (2010)

A loblolly pine (Pinus taeda) plantation with understory broadleaf species (Liquidambar styraciflua, Acer rubrum, Ulmus alata, Cornus florida) growing on what is described as a nitrogen-limited site in a FACE study over the period 1996-2004, during which time net primary production was calculated as "the sum of the production of coarse wood (stems, branches, coarse roots), leaf litter, fine roots and reproductive structures"



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