Interactions between tree species determine the dynamics of forest communities. Spatial and temporal changes in resource availability, variation in species composition and spatial distribution of trees may alter competitive interactions between species and, therefore, affect tree growth and forest productivity. In this study, we analyzed the intra and inter-specific interactions between European beech (Fagus sylvatica L.) and silver fir (Abies alba Mill.) in southern Italy (Molise and Calabria regions), and how these interactions affect basal area increments in mixed-species and pure stands. Results showed that intra-specific interactions have a negative effect on the basal area increment, both in pure and mixed-species stands of Molise and Calabria. Basal area increment was higher influenced by intra-specific interactions in pure stands than in mixed-species stands. Silver fir in Molise showed higher basal area increment in mixed-species stand, probably in relation with stand structure and space occupation that resulted in less competition between individual trees. European beech showed high values of intra-specific interactions in pure stands, likely related to the low self-tolerance of this species and to the spatial arrangement of trees, due to canopy closure. The absence of inter-specific interactions in mixed-species stands could be explained by the sub-dominant position of European beech, which may have limited the benefit derived from niche separation and complementarity for silver fir.
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Versace S, Garfì V, Dalponte M, Febbraro Mirko D, Frizzera L, Gianelle D, Tognetti R (2021). Species interactions in pure and mixed-species stands of silver fir and European beech in Mediterranean mountains. iForest 14: 1-11. - doi: 10.3832/ifor3476-013
Academic Editor
Giorgio Vacchiano
Paper history
Received: Apr 20, 2020
Accepted: Oct 26, 2020
First online: Jan 02, 2021
Publication Date: Feb 28, 2021
Publication Time: 2.27 months
© SISEF - The Italian Society of Silviculture and Forest Ecology 2021
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