Shade tolerance of Ailanthus altissima revisited: novel insights from southern Switzerland

Abstract

The tree of heaven (Ailanthus altissima (Mill.) Swingle) is considered to be an early-successional, gap-obligate pioneer species with vigorous height growth, low shade tolerance, early fecundity and large seed production. It is a highly invasive species in many temperate and Mediterranean ecosystems outside its natural range, especially after disturbance. Due to its low shade tolerance, the potential of A. altissima to colonise undisturbed forests is thought to be low. In this study we analysed the potential of juvenile A. altissima to grow and survive in sweet chestnut (Castanea sativa Mill.) forests in southern Switzerland. We used hemispherical photography to assess the light conditions of 204 individuals of A. altissima (31 % generative, 69 % vegetative) aged between 1 and 7 years (median: 3 years) in six sites. Generative (seed-borne) and vegetative (clonal ramet) offspring of A. altissima are able to grow in light conditions well below the requirements of shade-intolerant tree species such as European larch (Larix decidua Mill.) and Scots pine (Pinus sylvestris L.). The relatively low light conditions found to be sufficient for the growth and survival of generative regeneration of A. altissima suggest a higher shade tolerance for this species than previously stated, at least for early regeneration. Consequently, the colonisation frontier of A. altissima should be intensively monitored in both forest openings but also in closed canopy forests in the vicinity of seed-bearing A. altissima.

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Acknowledgments

We would like to thank Harald Bugmann, Aníbal Pauchard and two anonymous reviewers for valuable comments on earlier versions of the manuscript. This study was funded by the Bern University of Applied Sciences (BFH), the Federal Office for the Environment (FOEN), the Swiss Federal Research Institute for Forest, Snow and Landscape Research (WSL), and the Lead Agency process of the Swiss National Science Foundation (SNF) and the French National Research Agency (ANR) (Project-Nr.: 310030L_156661).

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Correspondence to Simon Knüsel.

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Knüsel, S., De Boni, A., Conedera, M. et al. Shade tolerance of Ailanthus altissima revisited: novel insights from southern Switzerland. Biol Invasions 19, 455–461 (2017). https://doi.org/10.1007/s10530-016-1301-4

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Keywords

  • Shade tolerance
  • Light requirement
  • Invasive tree
  • Colonisation