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

Summary

Published in Tree Physiology 34(2): 194-204. doi: 10.1093/treephys/tpt114

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 (<100 m2 in area; SMA) created by partial uniform single-tree harvest; (ii) irregular gaps of intermediate size (100–300 m2; 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 m2; 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 m2 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-m2 openings confirm its inability to grow as rapidly as fir in comparable open conditions.

Sector(s): 

Forests

Categorie(s): 

Scientific Article

Theme(s): 

Forestry Research, Forests, Silviculture

Departmental author(s): 

Prévost, Marcel

Author(s)

DUMAIS, Daniel et Marcel PRÉVOST

Year of publication :

2014

Format :

Paper

Keywords :

article scientifique de recherche forestière, sylviculture et rendement des forêts naturelles - peuplements mélangés, silviculture and yield of natural forests - mixed stands, canopy gaps, ecophysiology, gas exchange, natural regeneration, specific leaf area (SLA), temperate mixedwood forest

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