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Early silvicultural guidelines for intensive management of hybrid larch plantations on fertile sub-boreal sites

Summary

Published in Silva Fennica 51(2): Article id 1716

Use of fast-growing tree plantations on dedicated areas is proposed as a means of reconciling fibre production with conservation objectives. Success of this approach however requires finetuning silvicultural scenarios so that survival and growth are optimized while management and environmental costs are minimized. This is particularly challenging for hybrid larch (Larix × marschlinsii Coaz), a shade-intolerant species planted on fertile sites in Quebec (Canada) where legislation prevents the use of chemical herbicides. In this context, multiple motor-manual release treatments are often required, with high impacts on costs and social issues related to the scarcity of a qualified workforce. We established a split-split-plot design on a recently harvested site to assess the main and interaction effects of mechanical site preparation (MSP) intensity (five modalities of trenching or mounding), motor-manual release scenario (one or two treatments) and planting depth (0–3 cm or 3–10 cm) on hybrid larch seedling growth and survival six years after planting. Mechanical site preparation intensity and planting depth did not influence seedling growth after 6 years. The lack of significant interaction between MSP and release scenarios indicates that these operations should be planned independently. A more intensive MSP treatment cannot replace a second motor-manual release on fertile sites, as proposed to reduce costs. Our results also show the significant advantage of performing two motor-manual release treatments two years apart (the first one early in the scenario), over performing a single treatment. Our study provides silvicultural guidelines for the establishment of high-yield exotic larch plantations.

Sector(s): 

Forests

Categorie(s): 

Scientific Article

Theme(s): 

Forestry Research, Forests, Silviculture

Author(s)

THIFFAULT, Nelson, Alain PAQUETTE and Christian MESSIER

Year of publication :

2017

Keywords :

scarifiage, espèce exotique, croissance, survie, contrôle de la végétation, sylviculture intensive, zonage fonctionnel (TRIAD), sylviculture et rendement des plantations, article scientifique de recherche forestière, silviculture and yield of plantations, scarification, exotic tree species, growth, survival, vegetation management, intensive silviculture, forest functional zoning (TRIAD)

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