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Seasonal Respiration Rates of Yellow-Poplar Roots by Diameter Classes

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Root respiration rates (µl CO2/g dry wt/hr) of four diameter classes (>1.0, 1.0-0.5, 0.5-0.1, and <0.1 cm) of Liriodendron tulipifera roots were determined for winter and early summer in a differential respirometer. Respiration rates were influenced by root diameter, season, and temperature. At both time periods significant correlations (r² = 0.99) between diameter and CO2 production were observed. Respiration rates increased directly with temperature (Q10 = 2.7). When measured at the same temperature, roots removed from actively growing trees (June 1972) respired at rates 1.4 to 8 times that of similar diameter roots during winter dormancy (late November). Larger roots (>0.5 cm classes) exhibited the greatest increases in respiration. Forest Sci. 21:185-188.

Keywords: Liriodendron tulipifera L; metabolism; respiratory; temperature

Document Type: Journal Article

Affiliations: The Remote Sensing Institute, South Dakota State University, Brookings, South Dakota 57006

Publication date: June 1, 1975

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