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Tree-species diversification in Sub-Mediterranean pine forests: drivers, consequences and management options

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Issue date
2015-09-21
Author
Martín Alcón, Santiago
Other authors
Coll Mir, Lluís
Aunós Gómez, Álvaro
Universitat de Lleida. Departament de Producció Vegetal i Ciència Forestal
Suggested citation
Martín Alcón, Santiago. (2015) . Tree-species diversification in Sub-Mediterranean pine forests: drivers, consequences and management options. Universitat de Lleida. L.1441-2015 ; http://hdl.handle.net/10803/312149.
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Our results confirm that Sub-Mediterranean pinewoods in the eastern Pyrenees are currently undergoing a process of spontaneous diversification by broadleaved tree species (especially evergreen and marcescent oaks). The establishment of Quercus seedlings under the pine canopy was favored by the current levels of both canopy closure and shrub cover, which in contrast hampered pine recruitment and the established oaks (particularly Q. ilex) to reach more advanced developmental stages. We also show that the occurrence of large stand-replacing fires triggers important vegetation changes from pinewoods to other types of woody vegetation (shrublands or forests dominated by resprouting tree species). At landscape level, the nature of these changes does not only depend on fire severity and topographic variables, but also on fire legacies and the characteristics of the pre-fire vegetation. Finally, our results support the feasibility of planting or sowing late-successional species for diversifying sub-Mediterranean pine forests when the process does not occur naturally. In this regard, our findings advise assisted migration programs to manage risks by thoroughly considering species and provenances selection, thermal migration distances and the occurrence of extreme cold events in the planting site. We also show that negative responses associated to these events could be partially buffered by sowing and planting under relatively closed canopy.
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http://hdl.handle.net/10459.1/64224
European research projects
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  • Tesis Doctorals [1092]

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  • Stand-level drivers of tree-species diversification in Mediterranean pine forests after abandonment of traditional practices 

    Martín Alcón, Santiago; Coll Mir, Lluís; Salekin, Serajis (Elsevier, 2015-06-03)
    The progressive abandonment of traditional forest management over the last few decades has led to significant densification processes in most Mediterranean pine stands. In parallel, some of these stands have also shown ...
  • Diversifying sub-Mediterranean pinewoods with oak species in a context of assisted migration: responses to local climate and light environment 

    Martín Alcón, Santiago; Coll Mir, Lluís; Améztegui González, Aitor (Wiley, 2016)
    Questions How do thermal migration distance and extreme cold events affect seedling emergence and survival in assisted migration schemes in the sub-Mediterranean context? What role does plant provenance play? Can biotic ...

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