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Modeling tolerant hardwood sapling density and occurrence probability in the Acadian forests of New Brunswick, Canada: Results 14 years after harvesting

Publication: The Forestry Chronicle18 June 2021https://doi.org/10.5558/tfc2021-021

Abstract

Natural forest regeneration after natural or anthropogenic disturbance is difficult to predict given its high variability. The process is poorly documented for commercial northern hardwood species in the Acadian forest of eastern Canada. Our objective was to identify the silvicultural, environmental, and ecological factors that best explain the variability in sapling density and occurrence of two commercial tolerant hardwood species in New Brunswick: American beech (Fagus grandifolia Ehrh.) and sugar maple (Acer saccharum Marsh.). Forty-three permanent sample plots were established in 2002 and measured before harvesting in 2004. Sapling density and occurrence were measured 14 years after harvesting. The results showed that the interactions between the species and the residual merchantable basal area and between the species and the percent of hardwoods in the original stand best explained the sapling density and occurrence variation of tolerant hardwoods. The sapling density of sugar maple increased with increasing merchantable residual basal area. However, the effect of this variable was not significant for the density of American beech saplings. The density and occurrence of tolerant hardwood saplings both increased along with the percent of hardwoods in the original stand. These results provide an improved understanding about tolerant hardwood regeneration dynamics in New Brunswick forests.

Résumé

Il est difficile de prévoir la régénération naturelle de la forêt à la suite d’une perturbation d’origine anthropique puisqu’elle est hautement variable. Le processus est mal documenté dans les essences feuillues des forêts commerciales de la forêt acadienne de l’est du Canada. Nos travaux avaient pour but de trouver les facteurs sylvicoles, environnementaux et écologiques qui permettraient d’expliquer la variabilité de la présence et de la densité des gaules chez deux essences de feuillus tolérants commerciaux au Nouveau-Brunswick : le hêtre à grandes feuilles (Fagus grandifolia Ehrh.) et l’érable à sucre (Acer saccharum Marsh.). En 2002, nous avons donc établi quarante-trois placettes permanentes et les avons mesurées avant l’opération de récolte 2004. Quatorze ans après cette coupe, nous sommes retournés mesurer la densité et la présence des gaules. Les résultats nous indiquent que ce sont la relation entre l’essence et la surface terrière résiduelle, et celle liant l’essence au pourcentage de feuillus du peuplement original qui expliquent le mieux les variations dans la densité et la présence de gaules de feuillus tolérants. La densité des gaules d’érable à sucre avait tendance à augmenter avec une augmentation de la surface terrière marchande. Toutefois, l’effet de cette variable ne s’est pas avéré significatif pour la densité des gaules de hêtre à grandes feuilles. La densité et la présence des gaules de feuillus tolérants ont toutes les deux crû avec le pourcentage de feuilles dans le peuplement original. Ces résultats ont permis d’améliorer nos connaissances sur la dynamique de la régénération chez les feuillus tolérants dans les forêts du Nouveau-Brunswick.

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The Forestry Chronicle cover image
The Forestry Chronicle
Volume 97Number 02June 2021
Pages: 204 - 218

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Published online: 18 June 2021

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Key Words

  1. Acadian forest
  2. tolerant hardwoods
  3. sapling density
  4. occurrence probability
  5. regeneration modeling

Mots-clés

  1. Forêt acadienne
  2. feuillus tolérants
  3. densité des gaules
  4. probabilité de présence
  5. modélisation de la régénération

Authors

Affiliations

Mohammed Henneb
K.-C.-Irving Research Chair in Environmental Sciences and Sustainable Development, Université de Moncton, 18 avenue Antonine-Maillet, Moncton, NB E1A 3E9, Canada
Northern Hardwood Research Insitute Inc., 165 boul. Hébert, Edmundston, NB E3V 2S8, Canada
Gaetan Pelletier
Northern Hardwood Research Insitute Inc., 165 boul. Hébert, Edmundston, NB E3V 2S8, Canada
Mathieu Fortin
K.-C.-Irving Research Chair in Environmental Sciences and Sustainable Development, Université de Moncton, 18 avenue Antonine-Maillet, Moncton, NB E1A 3E9, Canada
Nelson Thiffault
K.-C.-Irving Research Chair in Environmental Sciences and Sustainable Development, Université de Moncton, 18 avenue Antonine-Maillet, Moncton, NB E1A 3E9, Canada
Marie-Andrée Giroux
K.-C.-Irving Research Chair in Environmental Sciences and Sustainable Development, Université de Moncton, 18 avenue Antonine-Maillet, Moncton, NB E1A 3E9, Canada

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