The Duke Forest FACE Experiment: CO2 Enrichment of a Loblolly Pine Forest
Photosynthetic rates by canopy foliage have increased up to 50 % over controls.
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.
Biomass increment has increased by 108 g C m-2 year-1 (27 %) over that in control plots.
Growth and respiration of roots are higher in CO2 fumigated plots.
Litterfall is greater in high CO2 plots and forest floor accumulation has increased.
There has been little or no change in the total amount of soil organic matter as a result of CO2 fumigations.
While the stimulation of growth by high CO2 persists after 8 years of fumigation, there is evidence of nitrogen limitation in the fumigated plots.
KeywordsFine Root Basal Area Increment Pinus Taeda Global Change Biol Fine Root Growth
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