TAILIEUCHUNG - Báo cáo lâm nghiệp: "C and 15 N isotopic fractionation in trees, soils and fungi in a natural forest stand and a Norway spruce plantation"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: C and 15 N isotopic fractionation in trees, soils and fungi in a natural forest stand and a Norway spruce plantation. | Ann. For. Sci. 64 2007 419-429 INRA EDP Sciences 2007 DOI forest 2007019 Available online at Original article 13C and 15N isotopic fractionation in trees soils and fungi in a natural forest stand and a Norway spruce plantation Bernd ZELLERa Claude BRECHETb Jean-Paul MAURICEc Francois Le TACONd a UR1139 Biogéochimie des Écosystèmes Forestiers Centre INRA de Nancy 54790 Champenoux France b UMR 1137 INRA-Nancy Université Henri Poincaré Écologie et Écophysiologie Forestière Centre INRA de Nancy 54790 Champenoux France c Groupe mycologique Vosgien 18 bis place des Cordeliers 88300 Neufchateau France d UMR 1136 INRA-Nancy Université Henri Poincaré Interactions Arbres Micro-Organismes Centre INRA de Nancy 54790 Champenoux France Received 3 August 2006 accepted 18 January 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 S15N. 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 with35N-depleted nitrogen. Moreover ectomycorrhizal species displayed a significant N fractionation during sporophore differentiation while saprotrophic fungi did not. 13C 15N forest stands saprotrophic fungi ectomycorrhizal fungi Résumé - Fractionnement isotopique 13C et 15N dans les arbres le sol et les champignons pour un peuplement de forêt naturelle et une

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