Climate Change Impacts on Alpine Vegetation: The Role of Microclimatic Variability

Abstract

Global surface temperatures have increased by about 1.1°C relative to 1850–1900, with 2011–2020 being the warmest decade on record and accompanied by changing precipitation patterns. Warming is amplified in alpine regions such as the European Alps, where temperature increases have been roughly twice the northern hemispheric average since the late 19th century, alongside contrasting precipitation trends between northern (wetter) and south-eastern (drier) areas. Alpine ecosystems, defined as treeless zones above the tree line, are highly sensitive to climate change, exhibiting upward species shifts, phenological changes, vegetation restructuring, and local extinctions. However, strong microclimatic heterogeneity may buffer these impacts. This study presents a narrative literature review of microclimatic buffering in alpine vegetation. The evidence was synthesized showing how topography-driven radiation differences, wind-induced cold-air pooling, and snow dynamics generate fine-scale habitat variability. These processes create microhabitats that can reduce exposure to macroclimatic warming and support potential microrefugia for plant species. The study argues that microclimatic buffering is a key but still insufficiently understood mechanism shaping alpine vegetation responses to climate change. Improved understanding of its limits is essential for more accurate predictions of vegetation dynamics and for informing conservation strategies in mountain ecosystems.