Warming leads to biomass increase, leaf nitrogen decline, and community turnover in Mediterranean Nardus stricta grasslands

This collection of datasets originates from a three-year experimental warming study (2021–2023) conducted in Mediterranean Nardus stricta grasslands located at five sites in Serra da Estrela Mountain, Portugal. The experiment used open-top chambers (Warming treatment) and paired Control plots to simulate climate warming effects on high-elevation grassland ecosystems.Together, these datasets encompass plant community structure, leaf nutrient composition, and environmental conditions (daily air temperature and soil moisture (VWC%), providing an integrated view of vegetation and ecosystem responses to experimental warming.