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Seasonal Allocation of Photoassimilated Carbon in Douglas Fir Seedlings ¹

^a Forest Research Laboratory, Forest Science Department, School of Forestry, Oregon State University, Corvallis, Oregon 97331

The uptake of CO₂ by Douglas fir (Pseudotsuga menziesii [Mirb.] Franco) seedlings and the allocation of photoassimilated carbon among five vegetative tissues were closely related to seedling phenology. In May, newly flushing needles required 5.2% day^–1 of photoassimilated carbon relative to needle tissue carbon. As these needles matured, this carbon requirement declined to 1.95% day^–1 in August, to 0.94% day^–1 in November, and to 0.76% day^–1 in January. Other tissues of Douglas fir seedlings required different amounts of photoassimilated carbon for growth and metabolism. These data provide a strong link between daily CO₂ uptake and the regulation of carbon allocation by seasonal phenology.

The data, obtained with long term labeling with ¹⁴CO₂, were analyzed with a compartment model representing the dynamic flux of carbon through the seedlings.

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