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13C and 15N isotopic fractionation in trees, soils and fungi in a natural forest stand and a Norway spruce plantation
Fractionnement isotopique 13C et 15N dans les arbres, le sol et les champignons pour un peuplement de forêt naturelle et une plantation d’épicéas
Annals of Forest Science volume 64, pages 419–429 (2007)
Abstract
15N and 13C natural abundances of foliage, branches, trunks, litter, soil, fungal sporophores, mycorrhizas and mycelium were determined in two forest stands, a natural forest and a Norway spruce plantation, to obtain some insights into the role of the functional diversity of saprotrophic and ectomycorrhizal fungi in carbon and nitrogen cycles. Almost all saprotrophic fungi sporophores were enriched in 13C relative to their substrate. In contrast, they exhibited no or very little shift of δ15N. Judging from the amount of C discrimination, ectomycorrhizal fungi seem to acquire carbon from their host or from dead organic matter. Some ectomycorrhizal species seem able to acquire nitrogen from dead organic matter and could be able to transfer it to their host without nitrogen fractionation, while others supply their host with 15N-depleted nitrogen. Moreover ectomycorrhizal species displayed a significant N fractionation during sporophore differentiation, while saprotrophic fungi did not.
Résumé
Les abondances naturelles du 15N et du 13C de la masse foliaire, des branches, des troncs, de la litière, du sol, des carpophores, des mycorhizes et du mycélium, ont été déterminées dans deux peuplements forestiers, une forêt naturelle et une plantation d’épicéas, afin d’obtenir quelques précisions sur le rôle de la diversité fonctionnelle des champignons saprophytes et ectomycorhiziens dans le cycle du carbone et de l’azote. Presque tous les champignons saprophytes présentent un enrichissement en 13C relativement à leur substrat. Par contre, ils ne présentent pas ou ne présentent que très peu de modifications du δ15N. En fonction de leur taux de discrimination du carbone, les champignons ectomycorhiziens semblent pouvoir acquérir du carbone à la fois à partir de leur hôte et de la matière organique morte. Quelques espèces semblent capables d’acquérir de l’azote organique du sol et de le transférer sans fractionnement à leur hôte alors que d’autres fournissent leur hôte en azote appauvri en 15N. De plus, les espèces ectomycorhiziennes présentent un fractionnement significatif de l’azote pendant la différentiation des carpophores, alors que les champignons saprophytes n’en présentent pas.
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Zeller, B., Brechet, C., Maurice, JP. et al. 13C and 15N isotopic fractionation in trees, soils and fungi in a natural forest stand and a Norway spruce plantation. Ann. For. Sci. 64, 419–429 (2007). https://doi.org/10.1051/forest:2007019
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DOI: https://doi.org/10.1051/forest:2007019