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
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300 ppm
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600 ppm
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900 ppm
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|
| Number of Results |
2
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| Arithmetic Mean |
51%
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|
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| Standard Error |
6.4%
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Experimental Conditions
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300 ppm
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600 ppm
|
900 ppm
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|
|
Hamilton et al. (2002) |
two years into FACE study on soils of "low nitrogen and phosphorus availability"
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60%
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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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42%
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