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Diversity and fruiting patterns of ectomycorrhizal and saprobic fungi as indicators of land-use severity in managed woodlands dominated by Quercus suber — a case study from southern Portugal

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Abstract:

We assessed the impacts of current management practices used to control shrub strata in Portuguese oak woodlands dominated by Quercus suber L. (montado) on fruiting diversity and abundance of ectomycorrhizal-forming fungi (ECMF) and saprobic fungi. Fruit bodies were collected over four fruiting seasons in 16 plots (20 m× 20m) selected in a montado landscape with extensive silvopastoral exploitation. A total of 9484 fruit bodies were found in 171 taxa (74 ECMF, 96 saprobic, and 1 parasitic). Our results show that shrub density control by permanent grazing or by cutting practices followed by soil tillage leads to lower fruiting production and greater changes in taxa composition, particularly for ECMF fruit bodies, than cutting practices without soil tillage. Principal response curve analysis showed that ECMF reacted more sensitively to these practices, in particular Laccaria laccata, Hebeloma cistophilum, Russula cyanoxantha, Cortinarius trivialis, and Lactarius volemus. We also observed that shrub cutting without soil tillage allowed ECMF fruiting to recover to predisturbance levels after 3 years. Our data imply that fruit bodies were useful indicators for assessing the severity of the effects of different land-use practices applied in montado areas on soil fungal populations.

Nous avons évalué les impacts des pratiques d’aménagement présentement utilisées pour contrôler la strate arbustive dans les forêts portugaises de chêne dominées par Quercus suber L. (montado) sur la diversité et l’abondance des fructifications des champignons ectomycorhiziens (CEM) et des champignons saprobies. Les fructifications ont été collectées pendant quatre saisons dans 16 parcelles (20 m × 20 m) choisies dans un paysage montado soumis à une exploitation sylvopastorale extensive. Au total, 9484 fructifications appartenant à 171 taxons ont été récoltées (74 CEM, 96 saprobiontes et un parasite). Nos résultats montrent que le contrôle de la densité des arbustes par le pâturage permanent ou par des pratiques de coupe suivie d’un travail du sol causent de plus grandes pertes de production de fructifications et des changements dans la composition des taxons plus importants, particulièrement dans le cas des fructifications de CEM, que les pratiques de coupe sans travail du sol. L’analyse de la courbe principale de réponse a montré que les CEM ont réagi avec plus de sensibilité à ces pratiques, en particulier Laccaria laccata, Hebeloma cistophilum, Russula cyanoxantha, Cortinarius trivialis et Lactarius volemus. Nous avons aussi observé que la coupe des arbustes sans travail du sol permettait aux fructifications de CEM de retrouver les niveaux qui existaient avant l’intervention après 3 années. Nos données signifient que les fructifications sont des indicateurs utiles pour évaluer la sévérité des effets de différentes pratiques d’utilisation des terres appliquées dans les zones montado sur les populations fongiques dans le sol.

Document Type: Research Article

Publication date: December 1, 2009

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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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