Homeostatic Adjustment of Loblolly Pine to CO2 Enrichment Page: 4 of 6
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Naidu, S.L., E.H. DeLucia and R.B. Thomas. 1998. Contrasting patterns of biomass
allocation in dominant and suppressed loblolly pine. Canadian Journal of
Forest Research 28: 1116-1124.
We compared size-dependent allometries of canopy dominant and suppressed loblolly
pine trees from stands of different ages to determine if patterns of biomass allocation
were different. This study developed the allometric relationships of loblolly pine trees
that we use to estimate biomass production from tree diameter at breast height in the
Duke FACE experiment.
DeLucia, E.H., J.G. Hamilton, S.L. Naidu, R.B. Thomas, J.A. Andrews, A. Finzi, M.
Lavine, R. Matamala, J.E. Mohan, G.R. Hendrey, and W.H. Schlesinger.
1999. Net primary production of a forested ecosystem under experimental
CO2 enrichment. Science 284: 1177-1179.
This study showed that trees in elevated CO2 rings grew 25% faster than trees in the
ambient CO2 rings after two years of CO2 enrichment. The findings provided the first
real data that allowed for global extrapolation on the ability of forests to sequester
increasing human-caused carbon dioxide emissions. These results suggested that if all
forests worldwide were to grow 25% faster in 50 years than they do now, forest trees
could absorb about half the expected CO2 emissions from fossil-fuel combustion.
Obviously, loblolly pines are fast growing species and don't represent forest species
globally so the 25 % stimulation in growth is more likely an upper limit for what the
world's vegetation can do.
DeLucia, E.H., R.B. Thomas and J.K. Ward, editors. 1999. Critical assessment of
the response of forest ecosystems to elevated atmospheric carbon dioxide.
Tree Physiology, special volume. 19 (4/5): 211-335.
This special issue of Tree Physiology was a collection of peer-reviewed papers presented
at a workshop entitled Critical Assessment of the Response of Forest Ecosystems to
Elevated Atmospheric Carbon Dioxide, partially supported by U.S. Department of
Herrick, J.D. and R. B. Thomas. 1999. Effects of CO2 enrichment on the
photosynthetic light response of sun and shade leaves of canopy swectgum
trees (Liquidambar styraciflua L.) in a forest ecosystem. Tree Physiology 19:
In this study using the dominant hardwood tree in the forest, we determined whether
photosynthetic behavior of leaves from the top of the tree differed from that of leaves
from the bottom of the tree. We found that they did differ and the differences were based
on differing leaf morphology and physiology in the sun and the shade. Sun leaves of
sweetgum trees had greater thickness, N and chlorophyll per unit leaf area than shade
leaves, as well as higher light-saturated net photosynthetic rates. As a result, the CO2-
stimulation of photosynthesis of sun leaves was almost twice as great as the C02-
stimulation of shade leaves. Since shade leaves make up a higher percentage of the total
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Homeostatic Adjustment of Loblolly Pine to CO2 Enrichment, report, March 15, 2003; United States. (digital.library.unt.edu/ark:/67531/metadc889831/m1/4/: accessed April 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.