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Suillus tomentosus tuberculate ectomycorrhizal abundance and distribution in Pinus contorta woody debris

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Tuberculate ectomycorrhizae (TEM) have been observed in decaying coarse woody debris (CWD) and may play a role in the nitrogen economy of forests. This study evaluates the occurrence of Suillus tomentosus (Kauff.) Singer, Snell and Dick TEM within CWD in Pinus contorta Dougl. ex Loud. var. latifolia Engelm. stands and relates their occurrence to CWD and soil characteristics as well as stand age. TEM were more abundant in the basal end of CWD incorporated in the forest floor than in the middle and top portions. Tubercle abundance was positively correlated with moisture and texture of CWD, degree of incorporation of CWD into the forest floor, and the amount of roots within CWD. There were significantly more TEM in CWD in young stands than in old stands and on sites with granitic soils than on sites with basaltic soils. Highly degraded CWD that is well incorporated in the forest floor appears to be an important microhabitat for the formation and occurrence of TEM.

Des ectomycorhizes qui produisent des tubercules (EMT) ont été observées dans les débris ligneux grossiers (DLG) en décomposition et pourraient jouer un rôle dans l'économie de l'azote en forêt. Cette étude évalue la fréquence des EMT de Suillus tomentosus (Kauff.) Singer, Snell and Dick en lien avec Pinus contorta Dougl. ex Loud. var. latifolia Engelm. dans les DLG de peuplements de cette essence et relie leur présence aux caractéristiques des DLG et du sol ainsi qu'à l'âge du peuplement. Les EMT étaient plus abondantes à la base des DLG incorporés dans la couverture morte qu'à l'extrémité ou que dans la portion médiane de ceux-ci. L'abondance des tubercules était positivement corrélée avec l'humidité, la texture et le degré d'incorporation des DLG dans la couverture morte et la quantité de racines dans le bois. Il y avait significativement plus de EMT dans les DLG des jeunes peuplements comparativement aux vieux peuplements ainsi que dans les stations avec un sol granitique comparativement aux stations avec un sol basaltique. Des DLG fortement dégradés et bien incorporés dans la couverture morte semblent former un microhabitat important pour la formation et le développement des EMT.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: February 1, 2006

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