Effects of selective cuts on the mycorrhizae of regenerating Betula alleghaniensis and Acer saccharum seedlings in two Quebec mixed deciduous forests

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Abstract:

The mycorrhizae of younger (2- to 3-year-old) and older (5- to 12-year-old) yellow birch (Betula alleghaniensis Britton) and sugar maple (Acer saccharum Marsh.) seedlings and saplings were recorded from naturally regenerating plants in gaps created by selective cuts and compared with those of plants of comparable age growing in the undisturbed forest. The levels of ectomycorrhizal colonization and the diversity of ectomycorrhizal fungi (based on morphotyping) were recorded for yellow birch and the levels of colonization and the abundance of arbuscules, vesicles, and coils were reported for the vesicular–arbuscular mycorrhizae of sugar maples. Selective cutting had no negative effect on the mycorrhizal community structure of yellow birch and sugar maple. This may be because of the quick regeneration of the mycorrhizal hosts coupled with the minor levels of soil disruption and relatively small gap size at the study sites. Greater colonization levels in the gaps versus uncut areas were observed in the 2- to 3-year-old maples but not in the 2- to 3-year-old birch seedlings. The types of ectomycorrhizal fungi colonizing the roots of birch seedlings from the gaps did not differ from those in the uncut forest areas.

Les mycorhizes de jeunes (2–3 ans) et de vieux (5–12 ans) semis et gaules de bouleau jaune (Betula alleghaniensis Britton) et d'érable à sucre (Acer saccharum Marsh.) ont été dénombrés chez la régénération naturelle dans des trouées dues à des coupes sélectives et comparées à celles de plants d'âge comparable croissant dans la forêt non perturbée. Le degré de colonisation ectomycorhizienne et la diversité des champignons ectomycorhiziens (basée sur le type morphologique) ont été notés chez le bouleau jaune. Chez l'érable à sucre, le degré de colonisation et l'abondance des arbuscules, des vésicules et des vrilles ont été notés pour les mycorhizes à vésicules et arbuscules. La coupe sélective n'a pas eu d'effet sur la structure de la communauté mycorhizienne du bouleau jaune et de l'érable à sucre. Cela pourrait être dû à la régénération rapide des hôtes combinée à une perturbation mineure du sol et à la relativement petite dimension des trouées dans les sites étudiés. Un degré de colonisation plus élevé a été observé dans les trouées comparativement aux endroits non coupés chez les semis d'érable de 2 à 3 ans mais non chez les semis de bouleau du même âge. Les types de champignons mycorhiziens qui colonisent les racines des semis de bouleau dans les trouées sont les mêmes que ceux qui sont présents dans la forêt non coupée.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: June 1, 2002

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  • Published since 1971, this monthly journal features articles, reviews, notes and commentaries on all aspects of forest science, including biometrics and mensuration, conservation, disturbance, ecology, economics, entomology, fire, genetics, management, operations, pathology, physiology, policy, remote sensing, social science, soil, silviculture, wildlife and wood science, contributed by internationally respected scientists. It also publishes special issues dedicated to a topic of current interest.
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