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We examined the ecophysiology and growth of 0.3–1.3 m tall advance red spruce ( Picea rubens  Sarg.) and balsam fir ( Abies balsamea  [L.] Mill.) regeneration during a 5-year period following the application of different harvest types producing three sizes of canopy openings: (i) small gaps (&lt;100 m 2  in area; SMA) created by partial uniform single-tree harvest; (ii) irregular gaps of intermediate size (100–300 m 2 ; INT) created by group-selection harvest (removal of groups of trees, mainly balsam fir, with uniform partial removal between groups); and (iii) large circular gaps (700 m 2 ; LAR) created by patch-selection harvest (removal of trees in 30-m diameter circular areas with uniform partial removal between gaps). An unharvested control (CON) was monitored for comparison. At the ecophysiological level, we mainly found differences in light-saturated photosynthesis of red spruce and specific leaf area of balsam fir among treatments. Consequently, we observed good height growth of both species in CON and INT, but fir surpassed spruce in SMA and LAR. Results suggest that intermediate 100–300 m 2  irregular openings create microenvironmental conditions that may promote short-term ecophysiology and growth of red spruce, allowing the species to compete with balsam fir advance regeneration. Finally, results observed for spruce in large 700-m 2  openings confirm its inability to grow as rapidly as fir in comparable open conditions.

Physiology and growth of advance Picea rubens and Abies balsamea regeneration following different canopy openings