11.5 Conclusions
Free-air CO2 enrichment (FACE) in the Duke Forest provides a whole-ecosystem arena in which to examine the response of a temperate coniferous forest to high, future levels of atmospheric CO2. At the end of 8 years of the experiment, we conclude:
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Photosynthetic rates by canopy foliage have increased up to 50 % over controls.
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Basal area increment has been stimulated 13–27 % versus that in control plots, with interannual variation due to variations in temperature and moisture during the growing season.
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Biomass increment has increased by 108 g C m-2 year-1 (27 %) over that in control plots.
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Growth and respiration of roots are higher in CO2 fumigated plots.
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Litterfall is greater in high CO2 plots and forest floor accumulation has increased.
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There has been little or no change in the total amount of soil organic matter as a result of CO2 fumigations.
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While the stimulation of growth by high CO2 persists after 8 years of fumigation, there is evidence of nitrogen limitation in the fumigated plots.
Keywords
- Fine Root
- Basal Area Increment
- Pinus Taeda
- Global Change Biol
- Fine Root Growth
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Schlesinger, W.H. et al. (2006). The Duke Forest FACE Experiment: CO2 Enrichment of a Loblolly Pine Forest. In: Nösberger, J., Long, S.P., Norby, R.J., Stitt, M., Hendrey, G.R., Blum, H. (eds) Managed Ecosystems and CO2 . Ecological Studies, vol 187. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-31237-4_11
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