Abstract
Effective analysis of the structure and function of forest ecosystems requires extensive investigation of many different aspects of the carbon cycle, including C fixation, C allocation, and respiratory C loss. Whole-tree C allocation patterns are analyzed, with special attention to the quantification of C allocation to roots and root respiration. Seasonal patterns of C allocation were examined by labeling certain trees with super(14)C. The climate and carbon dioxide concentrations during labeling were maintained at predetermined levels. Tree canopy CO sub(2) assimilation rates are detailed. A number of aspects of the tree-root system were then evaluated, including aboveground dark respiration and specific activity of root-soil respiration.