European Journal of Forest Research

, Volume 136, Issue 3, pp 433–446 | Cite as

Understanding the naturalization of Eucalyptus globulus in Portugal: a comparison with Australian plantations

  • Ana Águas
  • Matthew J. Larcombe
  • Hugo Matias
  • Ernesto Deus
  • Brad M. Potts
  • Francisco C. Rego
  • Joaquim S. Silva
Original Paper

Abstract

Despite the potential utility of a biogeographical approach to understanding the naturalization of exotic species, studies using this approach are scarce. Eucalyptus globulus is an economically important Australian tree species that has become naturalized in a number of countries where it was introduced. Portugal is an ideal territory to study the naturalization of E. globulus owing to: a long introduction history, the antipodal location compared to Australia and the large cultivated area. Wildling density was assessed in 116 E. globulus plantations in central Portugal through 213 transects established along plantation borders. Boosted regression trees were used to model the influence of plantation-scale variables. Results from this survey were compared with data obtained in plantations from seven Australian regions, where a similar sampling protocol had been used. In Portugal, wildlings were more abundant in plantations that were: located in moist aspects, coppiced, with older tree stems and corresponding to intermediate site growth indexes. The overall density (127 plants ha−1) was 14.9 times higher than in the Australian estate, but this ratio was reduced to 3.1 in a more comparable subset of unburnt, first rotation plantations. A generalized linear model fitted using a dataset combining the two surveys showed that country influenced wildling density, together with plantation rotation and stem age. These results provide insights into the naturalization of a widely cultivated tree species, pointing to a fundamental role of the introduction history, possibly acting along with the biogeographical characteristics of the introduced range.

Keywords

Plant establishment Exotic species Eucalypt plantation Forest management Introduction history Biogeography 

Notes

Acknowledgements

This research was developed in the scope of the “WildGum” project (FCT PTDC/AGR-FOR/2471/2012) funded by Fundação para a Ciência e a Tecnologia (FCT). A. A. and E. D. were supported by a PhD scholarship from FCT (SFRH/BD/76899/2011; PB/BD/113936/2015). A. A.’s and J. S. S.’s travels to Australia were funded by TRANZFOR programme from the European Commission—Marie Curie Actions. M.J.L’s and B.M.P’s travel to Portugal was funded by the "WildGum" project and a Maxwell Ralf Jacobs Scholarship Grant to M.J.L. We thank to Altri Florestal SA for providing access to their plantation estate and to data on plantation characteristics and management history, as well as for providing facilities for field work. Special thanks to Luis Ferreira for help with Altri’s database.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Ana Águas
    • 1
    • 2
  • Matthew J. Larcombe
    • 3
    • 4
  • Hugo Matias
    • 1
  • Ernesto Deus
    • 1
    • 6
  • Brad M. Potts
    • 4
  • Francisco C. Rego
    • 1
  • Joaquim S. Silva
    • 1
    • 5
  1. 1.Centre for Applied Ecology “Prof. Baeta Neves”, School of AgricultureUniversity of LisbonLisbonPortugal
  2. 2.School of Education and Social SciencesPolytechnic Institute of LeiriaLeiriaPortugal
  3. 3.Department of BotanyUniversity of OtagoDunedinNew Zealand
  4. 4.School of Biological Sciences and ARC Training Centre for Forest ValueUniversity of TasmaniaHobartAustralia
  5. 5.College of AgriculturePolytechnic Institute of CoimbraCoimbraPortugal
  6. 6.Department of Life Sciences, Centre for Functional EcologyUniversity of CoimbraCoimbraPortugal

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