Tree ring width data set from selected INIA-CSIC Pinus nigra permanent plots

This dataset contains annually resolved tree-ring width measurements from black pine (Pinus nigra Arn.) collected at 21 permanent plots across the Iberian Peninsula. The data were used to assess the effects of climate variability on tree growth and to explore how tree response to climate is modulated by site productivity and stand conditions. This dataset supported studies on forest growth dynamics, dendroclimatology, and model development for climate-sensitive growth projections.