Scots pine responses to elevated temperature and carbon dioxide concentration: growth and wood properties |
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| Authors: | Kilpeläinen Antti Peltola Heli Ryyppö Aija Kellomäki Seppo |
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| Institution: | University of Joensuu, Faculty of Forestry, P.O. Box 111, FIN-80101 Joensuu, Finland. antti.kilpelainen@joensuu.fi |
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| Abstract: | Growth and wood properties of 20-year-old Scots pine (Pinus sylvestris L.) trees were studied for 6 years in 16 closed chambers providing a factorial combination of two temperature regimes (ambient and elevated) and two carbon dioxide concentrations (CO2]) (ambient and twice ambient). The elevation of temperature corresponded to the predicted effect at the site of a doubling in atmospheric CO2]. Annual height and radial growth and wood properties were analyzed during 1997-2002. Physical wood properties analyzed included early- and latewood widths and their proportions, intra-ring wood densities, early- and latewood density and mean fiber length. Chemical wood properties analyzed included concentrations of acetone-soluble extractives, lignin, cellulose and hemicellulose. There were no significant treatment effects on height growth during the 6-year study. Elevated CO2] increased ring width by 66 and 47% at ambient and elevated temperatures, respectively. At ambient CO2], elevated temperature increased ring width by 19%. Increased ring width in response to elevated CO2] resulted from increases in both early- and latewood width; however, there was no effect of the treatments on early- and latewood proportions. Mean wood density, earlywood density and fiber length increased in response to elevated temperature. The chemical composition of wood was affected by elevated CO2], which reduced the cellulose concentration, and by elevated temperature, which reduced the concentration of acetone-soluble extractives. Thus, over the 6-year period, radial growth was significantly increased by elevated CO2], and some wood properties were significantly affected by elevated temperature or elevated CO2], or both, indicating that climate change may affect the material properties of wood. |
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