Hydraulic stress limits thermal acclimation in trees under chronic drought

Plant ecophysiological and associated environmental data for two tree species (Fagus sylvatica and Quercus pubescens) grown for five years in a factorial open-top climate chamber experiment (Model Ecosystem Facility, Birmensdorf, Switzerland) to test the long-term effects of heat (+5 °C) and soil drought (irrigation reduced by 50%). n = 4 trees per species and treatment, n = 48 trees total. Included data sheets:

• Environmental_Data.csv: Chamber-level environmental recorded every 10 minutes
• Tleaf.csv: Leaf temperatures recorded every 10 minutes
• Gas_exchange.csv: Leaf-level gas exchange data taken diurnally on four days during the growing season
• Leaf_traits.csv: Leaf functional traits
• TSMs_HSMs.csv: Photosynthetic thermal tolerance and leaf water potential data, summarized also in terms of leaf thermal safety margins and hydraulic safety margins, collected 3-4 times during the growing season
• Scorch.csv: Leaf-level leaf scorching data, including leaf thermal safety margins and scorching occurrence and presence, summarized by date