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Aims Some shade-tolerant understory tree species such as mountain maple (Acer spicatum L.) exhibit light-foraging growth habits. Changes in environmental conditions, such as the rise of carbon dioxide concentration ([CO 2]) in the atmosphere and soil warming, may affect the performance of these species under different light environments. We investigated how elevated [CO 2] and soil warming influence the growth and biomass responses of mountain maple seedlings to light availability. Methods The treatments were two levels of light (100% and 30% of the ambient light in the greenhouse), two [CO 2] (392 µmol mol −1 (ambient) and 784 µmol mol −1 (elevated)) and two soil temperatures (Tsoil) (17 and 22°C). After one growing season, we measured seedling height, root collar diameter, leaf biomass, stem biomass and root biomass. Important findings

journal of plant ecology

Effects of elevated carbon dioxide concentration and soil temperature on the growth and biomass responses of mountain maple (Acer spicatum) seedlings to light availability