The Calluna life cycle concept revisited: implications for heathland management / Jenny SCHELLENBERG J. / 2021    

in 31 - 2022 - 31-Biodiversity and Conservation-2022 (Bulletin de Biodiversity and Conservation) Titre : The Calluna life cycle concept revisited: implications for heathland management Type de document : texte imprimé Auteurs : Jenny SCHELLENBERG J., Auteur ; Erwin BERGMEIER E., Auteur Année de publication : 2021 Importance : 119-141 Langues : Français (fre) Catégories : CALLUNA VULGARIS ESPECE PRIORITAIRE EUROPE Mots-clés : Calluna vulgaris, Degeneration, Disturbance, Growth phase, Heathland conservation, Heather vitality, Life cycle, Plant age Résumé : Heather, Calluna vulgaris, is a key species of European dry heath and central determinant of its conservation status. The established Calluna life cycle concept describes four phases—pioneer, building, mature, and degeneration—distinguishable by growth and vitality characteristics of undisturbed plants grown from seeds. However, little is known about the life cycle and ageing of plants subjected to severe disturbance, although measures to this effect (burning, mowing) are common in heathland management. We studied the vitality of over 400 heather plants by examining multiple morphological (plant height, long shoot and inflorescence lengths, flowering activity), anatomical (growth rings) and environmental (management, nitrogen deposition, climate) attributes. We found Calluna vitality to be mainly determined by the aboveground stem age, and that severe disturbances promote vigorous vegetative regeneration. Ageing-related shifts in the habit and vitality of plants resprouting from stem-base buds is similar to that of seed-based plants, but the former revealed higher vitality when young, at the cost of a shorter life span. In contrast, plants originating from decumbent stems resemble building-stage plants but apparently lack the capacity to re-enter a cycle including stages other than degeneration-type. As a consequence, we supplemented the established heather life cycle concept with a post-disturbance regeneration cycle of plants derived from resprouting. We conclude that management of dry lowland heathlands should include rotational small-scale severe disturbance to support both seed germination and seedling establishment as well as vegetative regeneration chiefly of young heather plants capable of resprouting from buds near rootstock. Saisie BD Flore : Rien à saisir Citation bibliographique : SCHELLENBERG J. & BERGMEIER E. 2022. - The Calluna life cycle concept revisited: implications for heathland management. Biodiversity and Conservation 31 : 119-141. En ligne : https://doi.org/10.1007/s10531-021-02325-1 Format de la ressource électronique : DOI Permalink : https://portail-documentaire.cbnmc.fr/index.php?lvl=notice_display&id=30164

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