We constructed 6 tree-ring chronologies of European beech (Fagus sylvatica L.), from 6 selected locations on the Moncayo mountain in Spain. The sites were located at different altitudes from 1150 to 1600 m. We performed analysis of missing rings, dating, ring-width measurements and cross-dating of tree-rings. We created raw and 3 types of ARSTAN chronologies, and performed dendroclimatological analyses. Missing tree rings were common in older trees, and in some years, we found missing rings at all locations. We used ARSTAN residual chronologies, monthly sums of precipitations and average monthly temperature data for dendroclimatological analysis with DENDROCLIM 2002. We found that June precipitations positively affected tree-ring variation of beech at 4 locations with elevations 1170 to 1420 m. On the other hand, April temperatures negatively affected tree-ring variation of beech at 2 locations at the altitudes 1500 to 1600 m. In the site located at 1600 m a.s.l. we also observed positive effect of temperatures from May until August. Comparisons with the results of dendroclimatological analyses of beech from different sites all over Slovenia have shown that positive effect of June precipitations was recorded at altitudes from 300 to 1000 m. Negative effect of April temperatures has not been observed in Slovenia. Similarly like in Spain at 1600 m, in Slovenia positive effect of summer temperatures was recorded on the Alpine beech sites located at the altitudes 1000 m or higher.
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