Data from: Uniform regulation of stomatal closure across temperate tree species to sustain nocturnal turgor and growth (Q6683522)

This dataset accompanies the manuscript "Uniform regulation of stomatal closure across temperate tree species to sustain nocturnal turgor and growth." The study focuses on stomatal control in mature trees, which must balance water loss through stomatal pores with carbon uptake via photosynthesis. In the short term on daily or seasonal scales plants regulate stomatal conductance (gₛ) to limit water loss to the atmosphere. Understanding gₛ responses to low water availability is particularly important, given the significant variability in gₛ and photosynthetic responses observed globally. This dataset provides unique empirical data characterizing the water status conditions under which mature trees (2035 m in height) of various species reduce gₛ, with a focus on diel leaf water potential (Ψleaf) dynamics and growth. Over three years, we conducted intensive canopy and stem monitoring on 95 trees from nine common temperate tree species across a broad range of environmental conditions. Using these data, we tested whether stomatal closure occurs under more uniform pre-dawn or midday Ψleaf conditions. The dataset includes measurements from broadleaved species (Fagus sylvatica L., Acer pseudoplatanus L., Fraxinus excelsior L., Carpinus betulus L., and Sorbus torminalis Crantz) and conifers (Picea abies Karst., Abies alba Mill., and Pinus sylvestris L.). Additionally, hybrid Quercus trees (Quercus petraea Liebl. Quercus robur L.) were treated as a single species. To confirm the robustness of our findings, we also incorporated measurements of Ψleaf, gₛ, and whole-tree transpiration from multiple monitoring sites in Europe and Australia.