Competitive status influences tree‐growth responses to elevated CO2 and O3 in aggrading aspen stands

By E. P. McDonald, Eric L. Kruger, D. E. Riemenschneider, J. Isebrands. 2002

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Rising concentrations of atmospheric CO2 have increased growth in natural stands of quaking aspen (Populus tremuloides) (2009, background): “Because genetically distinct aspen clones differ in their growth responses to experimentally elevated CO2 (Wang et al., 2000; McDonald et al., 2002) and because growth rates in aspen are known to increase with individual heterozygosity (Jelinski, 1993; Mitton & Grant, 1996), we also investigated…”
Variation in tolerance to herbivory is mediated by differences in biomass allocation in aspen (2007, methodology): “Throughout the experiment, trees were watered as needed.”
Tropospheric O3 moderates responses of temperate hardwood forests to elevated CO2: a synthesis of molecular to ecosystem results from the Aspen FACE project (2003, background): “…the growth and allometry of individual genotypes over the next several years, our intensive measurements of each plant in the experiment will enable us to document mortality and dominance at the genotype level over time, as well as to study interspecific interactions (McDonald et al. 2002).”
Competition increasingly dominates the responsiveness of juvenile beech and spruce to elevated CO2 and/or O3 concentrations throughout two subsequent growing seasons (2005, result): “This result also confirms that the positive growth response to elevated CO2 is greater for competitively advantaged trees (McDonald et al., 2002).”