Influence of land use and climate on recent forest expansion: a case study in the Eurosiberian–Mediterranean limit of north‐west Spain

Abstract

1.In Mediterranean mountainous areas, forests have expanded in recent decades because traditionalmanagement practices have been abandoned or reduced. However, understanding the ecologicalmechanisms behind landscape change is a complex undertaking because the influence of land usemay be reinforced or constrained by abiotic factors such as climate. In this work, we evaluated theircombined effects on recent forest expansion across climatic, topographic and management gradients.2.We used orthorectified aerial photographs from the second half of the twentieth century (1956,1974, 1983, 1990 and 2004) to monitor changes in forest distribution in a set of 20 head-waterbasins in the Cantabrian Mountains of north-west Spain, at the Eurosiberian–Mediterranean limit. Inparticular, we evaluated the role of land-use history (comparing natural vs. anthropic basins) andmicroclimate (comparing shaded vs. sunny aspects) of forest gain/loss rates and spatial distributionshifts. Finally, we applied Species Distribution Modelling techniques (MaxEnt and BIOMOD) in thestated scenarios of land-use history and microclimate, to assess habitat suitability for forest expan-sion on the basis of topography, soil properties and mesoclimatic variables.3.Forest cover increased from 10.72% in 1956 to 27.67% in 2004 in the area. The rate of expan-sion was significantly higher in natural basins and, particularly, on shaded slopes. In all cases, themean elevation of new forest patches increased during the study period, which was particularly evi-dent on natural sunny slopes. The performance of the models and the magnitude of the effects var-ied across land-use histories and microclimatic conditions. Soil properties and temperature andprecipitation in late spring and early summer were the main drivers of forest expansion in modellingexercises, although expansion rates and upward altitudinal shifts were primarily controlled by land-use history and the biogeographic origin of the forests.4.Synthesis. The combination of monitoring and modelling techniques used in this work contributedto the understanding of forest expansion in cultural systems, indicating that ecological succession isnot a homogeneous process, but varies spatially due to human and abiotic constraints since historical times.