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Scots pine ectomycorrhizal fungal inoculum potential and dynamics in podzol-specific humus, eluvial and illuvial horizons one and four growth seasons after forest clear-cut logging

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The aims of this microcosm-based study were to characterize Scots pine ectomycorrhizal (EcM) inoculum potential in humus (O) and underlying eluvial (E) and illuvial (B) mineral podzol soil horizons and to compare the inoculum potential 1 and 4 years following clear-cut logging. The specific horizons were collected from a Scots pine control uncut stand, the adjacent interface zone (3–10m from the forest edge), and the adjoining clear-cut area. The highest Simpson's reciprocal diversity indices (SRDI) of ectomycorrhizal morphotypes and polymerase chain reaction – internal transcribed spacer – restriction fragment length polymorphism (PCR-(ITS)-RFLP) taxa were detected in the humus and E horizon. The B horizon supported the lowest SRDI, but the community consisted of mycorrhizas representing active rhizomorph-forming species. Identified RFLP taxa, confirmed via ITS sequence analysis, highlighted horizon specificity for some genera and species. With respect to clear-cutting impacts, the most dominant ectomycorrhizal morphotypes detected and diversity indices were the same irrespective of the sampling time, which strongly indicates that inoculum potential is maintained up to four growth seasons after the clearcut. No forest treatment dependent differences in Scots pine seedling biomass were detected, but, compared with humus, significantly reduced biomass was recorded in deeper mineral soil horizons. The data are discussed in relation with recent vertical profile studies and forest silvicultural practices.

Les objectifs de cette étude basée sur un microcosme consistaient à caractériser le potentiel d’inoculum ectomycorhizien du pin sylvestre dans l’humus (O) et les horizons minéraux sous-jacents éluvial (E) et illuvial (B) d’un podzol ainsi qu’à comparer le potentiel d’inoculum un et quatre ans après une coupe à blanc. Les horizons spécifiques ont été collectés dans un peuplement témoin non coupé de pin sylvestre, la zone de transition adjacente (3–10 m de la lisière de la forêt) et la zone attenante coupée à blanc. Les indices de diversité réciproque de Simpsons (IDRS) les plus élevés des morphotypes ectomycorhiziens et des taxons basés sur la technique PCR-(ITS)-RFLP ont été détectés dans l’humus et l’horizon E. L’horizon B avait les IDRS les plus faibles mais la communauté était constituée de mycorhizes qui représentaient les espèces qui forment des rhizomorphes actifs. Les taxons identifiés par RFLP et confirmés par l’analyse de séquence ont mis en évidence le fait que certains genres et espèces soient spécifiques à un horizon. Quant aux impacts de la coupe à blanc, les morphotypes ectomycorhiziens les plus dominants détectés et les indices de diversité étaient les mêmes peu importe le moment de l’échantillonnage, ce qui supporte fortement le fait que le potentiel d’inoculum est maintenu jusqu’à quatre saisons de croissance après la coupe à blanc. Aucune différence due aux traitements n’a été détectée dans la biomasse des semis de pin sylvestre mais, comparativement à l’humus, la biomasse était significativement plus faible dans les horizons plus profonds du sol minéral. Les données sont discutées en relation avec les récentes études de profils verticaux et les nouvelles pratiques sylvicoles.

Document Type: Research Article

Publication date: February 1, 2007

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