Among stand heterogeneity is key for biodiversity in managed beech forests but does not question the value of unmanaged forests: Response to Bruun and Heilmann‐Clausen (2021)

P. Schall,S. Heinrichs,C. Ammer,M. Ayasse,S. Boch,F. Buscot,M. Fischer,K. Goldmann,J. Overmann,E. Schulze,J. Sikorski,W. Weisser,T. Wubet,M. Gossner

Published 2021 in Journal of Applied Ecology

ABSTRACT

1. Schall et al. (2020) assessed how a combination of different forest management systems in managed forest landscapes dominated by European beech may affect the biodiversity (alpha, beta and gamma) of 14 taxonomic groups. Current forest policy and nature conservation often demand for combining uneven- aged man - aged and unmanaged, set- aside for nature conservation, beech forests in order to promote biodiversity. In contrast to this, Schall et al. (2020) found even- aged shelterwood forests, represented by different developmental phases, to support highest regional (gamma) diversity. 2. By pointing out that unmanaged forests included in our study are not old- growth forests, Bruun and Heilmann- Clausen (2021) challenge our conclusion as not providing sound scientific advice to societies. It is true that the studied unman - aged forests are not representing old- growth forests as defined in the literature. However, we demonstrate the representativeness of our unmanaged forests for current beech forest landscapes of Central Europe, where managed forests were more or less recently set- aside in order to develop old- growth structures. We also show that the managed and recently unmanaged forests in our study already dif - fer distinctively in their forest structures. 3. We use this response

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