Alien tree species and plant diversity in urban and semi-urban environments: the case of black locust (Robinia pseudoacacia L.)

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Nicoletta Ruggiero
5 anni fa
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1 Alien tree species and plant diversity in urban and semi-urban environments: the case of black locust (Robinia pseudoacacia L.) Tommaso Sitzia & Thomas Campagnaro

3 Black locust (Robinia pseudoacacia L.) 1635? 1601 or 1635? 1662

4 Black locust (Robinia pseudoacacia L.) N-fixing, fast growth, adaptable to many conditions Perceived as negative for biodiversity Positive: fuelwood, honey

5 Outline Introduction Case study: Robinia pseudoacacia Conclusion

6 Introduction (FAO 2010)

7 Introduction An European trend: forest expansion but also spontaneous development of patches of trees Area Trentino province Abruzzo region M. Grappa area Annual rate (%) Reference 0.1 Sitzia Corona et al Salvadori et al Switzerland 0.14 Zimmermann et al. 2007

to: abandonment of croplands, pastures, meadows and

8 Introduction An European trend: forest expansion but also spontaneous development of patches of trees Due to: abandonment of croplands, pastures, meadows and urbanindustrial areas Picture credit: GiovanniTrentanovi

species diversity Urban woodlands: promote biodiversity

9 Forest patches in urban and peri-urban settings They appear to be hostile environments However, cities are hotspots of species diversity Urban woodlands: promote biodiversity conservation Include both typical urban and semi-natural habitats

10 Black locust: why urban and peri-urban High presence Disturbance Expansion Picture credit: GiovanniTrentanovi

11 Evidence from the Veneto region (Sitzia et al. 2012) urban discontinuous continuum (Indovina 1990)

12 Evidence from the Veneto region Richness Tot Natives Aliens Groundlayer Forest Grassland NAT Mean Min Max ROB Mean Min Max p No differences in α-diversity Only a slight difference in β-diversity for ground-layer species

13 And in other cases? In Berlin (Trentanovi et al. 2013) Total Natives Aliens Richness α-diversity β-diversity Presence of rare native species (Pysek et al. 2012) Calls for further research on biodiversity Picture credit: GiovanniTrentanovi

14 How to translate into urban planning? Should we take advantage of this? Related ecosystem services Is it possible to value these patches of trees through urban planning? Picture credit: GiovanniTrentanovi

15 Thank you for the attention

16 Acknowledgements We are grateful to Giovanni Trentanovi for the nice photographs and to Duncan McCollin for his helpful comments. References Corona, P., Pompei, E. & Scarascia Mugnozza, G. (2005) Stima probabilistica del tasso di espansione annua e del valore al 1990 della superficie forestale nella Regione Abbruzo. Forest@, 2, Indovina, F. (1990) La città diffusa. In: Indovina, F., Matassoni, F., Savino, M., Sernini, M., Torres, M. & Vettoretto L. (ed.) La città diffusa. IUAV DAEST, Venezia, Pyšek, P., Chytrý, M., Pergl, J., Sádl, J. & Wild, J. (2012) Plant invasions in the Czech Republic: current state, introduction dynamics, invasive species and invaded habitats. Preslia, 84, Salvadori, I., Pilli R. & Anfodillo, T. (2006) Proposta di una metodologia di analisi della variazione di superficie boscata tramite foto aeree per l applicazione del protocollo di Kyoto: il caso della Comunità Montana del Grappa (TV). Forest@, 3, Sitzia, T. (2009) Ecologia e gestione dei boschi di neoformazione nel paesaggio del trentino. Provincia Autonoma di Trento, Servizio Foreste e Fauna, Trento. Sitzia, T., Campagnaro, T., Dainese, M. & Cierjacks, A. (2012) Plant species diversity in alien black locust forests: a paired comparison with native stands across a north-mediterranean range expansion. Forest Ecology and Management, 285, Trentanovi, G., von der Lippe, M., Sitzia, T., Ziechmann, U., Kowarik, I. & Cierjacks, A. (2013) Biotic homogenization at the community scale: disentangling the roles of urbanization and plant invasion. Diversity and Distribution, DOI: /ddi Zimmermann, N.E., Bolliger, J., Gahrig-Fasel, J., Gellrich, M., Kienast, F. & Rutherford, G.N. (2007) Where do all the trees come from? Land abandonment and forest regeneration in the Swiss Alps. In: Bunce, R.G.H., Jongman, R.H.G., Hojas, L. & Weel, S. (ed.) Proceedings of the 7 IALE World Congress. IALE Pubblication seris 4,

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