Interannual variability in competitive effects in mixed and monospecific forests of Mediterranean stone pine

摘要: Abstract The management of species composition and competition are two the main adaptive options that forest managers propose to cope with expected negative impacts climate change on growth in Mediterranean basin. Species mixture can improve resistance resilience ecosystems face up global change. However, it seems likely will modify mixed stands dynamics. Thus, studying inter-tree relationships an annual basis is key understanding ecosystem dynamics region. aim this paper was evaluate effects tree Pinus pinea secondary vs. monospecific over a period 15 years contrasting climatic conditions. We obtained basal area data from ring measurement cores cross section slices 372 trees P. L . , Juniperus thurifera L., Quercus ilex subsp. ballota (Desf.)) Samp. faginea Lam., Spanish Northern plateau, approximately half which were stands. analysed effect intra interspecific comparing performance several distance dependent indexes through linear models. These indices calculated for all within each plot year study. results showed competitive reduction amelioration indicating spatial temporal niche separation between size-symmetric competition. Size-asymmetric pines indicated largest individuals obtain majority contested resources suppressing their smaller pine neighbours. Intraspecific interactions more than interactions. And we finally provide evidence enhancement water stressed years promotion mixtures powerful tool buffer