Pine Stand Density Influences the Regeneration of Acacia saligna Labill. H.L.Wendl. and Native Woody Species in a Mediterranean Coastal Pine Plantation

摘要: Mediterranean plantations are the most suitable areas to assess vegetation dynamics and competitive interactions between native exotic woody species. Our research was carried out in a coastal pine plantation (Sicily) where renaturalization by species (Pistacia lentiscus L. Olea europaea var. sylvestris) invasion Acacia saligna (Labill.) H.L.Wendl. simultaneously occur. The regeneration pattern of understory evaluated six experimental plots along stand density gradient, from 200 approximately 700 pines per hectare. Both had significant negative relationship with natural regeneration. positively correlated density, while Pistacia showed non-significant relationship. Saplings both were mostly less than 1 m high, whereas 70% individuals higher m. We found that 400 hectare should be considered minimum keep under control, favouring establishment understory. successful control requires an integrated management strategy, including different forest interventions according density: thinning, measures against Acacia, actions.