Environmental Data: Hydraulic stress limits thermal acclimation in tre...

Description

Plant ecophysiological and associated environmental data for two tree species (*Fagus sylvatica* and *Quercus pubescens*) grown for five years in a factori...

Citation

Kullberg, A., Milano, A., Poretti, A., Ma, Y., Favre, P., Johnson, K., Bortolami, G., Bergström, M., Juillard, T., Wu, J., Guo, Z., Gisler, J., Schaub, M., Grossiord, C. (2025). Hydraulic stress limits thermal acclimation in trees under chronic drought. EnviDat. https://www.doi.org/10.16904/envidat.720.

Resources

• README.txt

  README file with more information about the dataset.

  README.txt

• Environmental_Data.csv

  Chamber-level abiotic data recorded every 10 minutes. Variable List: - Time (MM/DD/YYYY HH:MM) - Chamber: open-top-chamber ID - Treatment: chamber abiotic treatment (C = control, H = heated, RM = reduced soil moisture, H_RM = heated and reduced soil moisture) - Heating: Yes or no - RM: Reduced soil moisture, yes or no - Tair: Air temperature (degrees C) - Tair_sd: Standard deviation of air temperature - RH: Relative humidity - RH_sd: Standard deviation of relative humidity - VPD: Vapor pressure deficit (kPa) - Tsoil: Soil temperature (degrees C) - Soil_m: Volumetric soil water content (m^3/m^3) - PPFD: Photosynthetic photon flux density (micromoles m^-2 s^-1) *collected from a weather station next to the open-top-chambers (50% intensity inside chambers) - windspeed: (m/s) *collected from a weather station next to the open-top-chambers

  Environmental_Data.csv

• Scorch.csv

  Tree-level leaf scorching occurrence and severity data summarized by date with daily leaf thermal safety margins. Variable List: - TreeID: Unique identifier for individual trees - Date (MM/DD/YYYY) - Heating: Yes or no - RM: Reduced soil moisture, yes or no - Treatment: chamber abiotic treatment (C = control, H = heated, RM = reduced soil moisture, H_RM = heated and reduced soil moisture) - Species: Tree species - Tleaf: Leaf temperature (degrees C) *measured by an infrared sensor integrated into the Cavicam - Tcrit: Critical thermal threshold of Photosystem II (degrees C) *daily entries inherit the Tcrit measured onthe next measurement date and applied to the interval preceding it (or are forward-filled when Tcrit could not be estimated in August or September) - TSM: Leaf thermal safety margin (difference between Tcrit and Tleaf, in degrees C) - Scorch_binary: Binary indicating whether scorching occurred on that date (0 = no, 1 = yes) - Percent_affected: Percent of the camera window affected by scorching during a scorching event

  Scorch.csv

• TSMs_HSMs.csv

  Tree-level photosynthetic thermal tolerance, leaf water potentials, thermal safety margins, and hydraulic safety margins measured 3-4 times per tree during the growing season. Variable List: - TreeID: Unique identifier for individual trees   - Species: Tree species - Campaign: Month of the growing season in which data was collected - Heating: Yes or no - RM: Reduced soil moisture, yes or no - Treatment: chamber abiotic treatment (C = control, H = heated, RM = reduced soil moisture, H_RM = heated and reduced soil moisture) - Waterpotential: midday leaf waterpotential (MPa) - WPtlp: Waterpotential at leaf turgor-loss-point (MPa) *Measured by Mas, E., Cochard, H., Deluigi, J., Didion-Gency, M., Martin-StPaul, N., Morcillo, L., Valladares, F., Vilagrosa, A., & Grossiord, C. (2024). Interactions between beech and oak seedlings can modify the effects of hotter droughts and the onset of hydraulic failure. New Phytologist, 241(3), 1021-1034. https://doi.org/https://doi.org/10.1111/nph.19358 - HSM: Hydraulic safety margin (difference between WPtlp and Waterpotential, in MPa) - Tcrit: Critical thermal threshold of Photosystem II (degrees C) - T50: High leaf temperature at which Photosystem II function declines by 50% (degrees C) - Tleaf.max: Maximum leaf temperature during the week preceding thermal tolerance measurement - TSM.min: Minimum leaf thermal safety margin during the week preceeding thermal tolerance measurement (difference between Tcrit and Tleaf.max, in degrees C)

  TSMs_HSMs.csv

• Leaf_traits.csv

  Tree-level leaf functional trait data. Variable List: - TreeID: Unique identifier for individual trees - Chamber: open-top-chamber ID - Treatment: chamber abiotic treatment (C = control, H = heated, RM = reduced soil moisture, H_RM = heated and reduced soil moisture) - Heating: Yes or no - RM: Reduced soil moisture, yes or no   - Species: Tree species - Leaf_width (cm) - Leaf_area (cm^2) - Stomatal_density (count per cm^2) - Pore_length: Stomatal pore length (micrometers) - Guard_cell_width: Stomatal guard cell width (micrometers) - Leaf_thickness (mm) - Epidermal_thickness (mm) - Parenchyma_thickness (mm) - Parenchyma:Epidermis: Ratio between parenchyma and epidermal thickness - Reflectance: Reflectance of photosynthetically active radiation (400-700), fraction - Transmittance: Transmittance of photosynthetically active radiation (400-700), fraction - Absorptance: Absorptance of photosynthetically active radiation (400-700), fraction - Absorbance: Optical absorbance of photosynthetically active radiation (400-700 nm), unitless - g1: Medlyn-style stomatal slope calculated with Licor LI6800 data

  Leaf_traits.csv

• Gas_exchange.csv

  Leaf-level gas exchange collected diurnally for each tree on 4 days of the growing season and summarized to growing-season mean. Variable List: - TreeID: Unique identifier for individual trees - Chamber: open-top-chamber ID - Species: Tree species - Treatment: chamber abiotic treatment (C = control, H = heated, RM = reduced soil moisture, H_RM = heated and reduced soil moisture) - Heating: Yes or no - RM: Reduced soil moisture, yes or no - gsw.mean: Mean stomatal conductance to water vapor (mol m^-2 s^-1) - E.mean: Mean transpiration rate (mol m^-2 s^-2) - Tdiff.mean: Mean difference between leaf and air temperature on the day of Licor measurements - lnE.mean: Mean of the natural log of the transpiration rate - lnE.mean~Tdiff.mean_slope: The slope of the linear least-squares relationship between the natural log of lnE.mean and Tdiff.mean

  Gas_exchange.csv

• Tleaf.csv

  Tree-level leaf temperature data recorded every 10 minutes. Variable List: - Timestamp (MM/DD/YYYY HH:MM) - TreeID: Unique identifier for individual trees - Chamber: open-top-chamber ID - Treatment: chamber abiotic treatment (C = control, H = heated, RM = reduced soil moisture, H_RM = heated and reduced soil moisture) - Heating: Yes or no - RM: Reduced soil moisture, yes or no   - Species: Tree species - Tair: Air temperature (degrees C) - Tleaf: Leaf temperature (degrees C) - Tdiff: Leaf-to-air temperature differential (degrees C)

  Tleaf.csv