Fig. 3From: Pinus nigra Arn. ssp. salzmannii seedling recruitment is affected by stand basal area, shrub cover and climate interactionsStandardized Precipitation-Evapotranspiration Index (SPEI) for 2012 and 2013, estimated from a standardized sum of monthly differences between precipitation (P) and potential evapotranspiration (PET)Back to article page