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This package follows the Prometheus wiki spreadsheet from Sack and Pasquet-Kok at:

https://prometheusprotocols.net/function/water-relations/pressure-volume-curves/leaf-pressure-volume-curve-parameters/

For references, see Koide et al. 2000, Sack et al. 2003, and Tyree & Hammel 1972.

library(dplyr)
library(photosynthesis)

# Read in data
dat = system.file("extdata", "PV_curve.csv", package = "photosynthesis") |>
  read.csv()

# Fit one PV curve
fit = fit_PV_curve(filter(dat, ID == "L2"))

# See fitted parameters
fit[[1]]
##        SWC      PI_o psi_TLP  RWC_TLP      eps       C_FT      C_TLP  C_FTStar
## 1 2.438935 -1.399302   -1.75 88.67684 12.20175 0.06456207 0.09923338 0.5161476
# Plot water mass graph
# fit[[2]]

# Plot PV Curve
# fit[[3]]

#Fit all PV curves in a file
fits = fit_many(
  dat,
  group = "ID",
  funct = fit_PV_curve,
  progress = FALSE
)

# See parameters
fits[[1]][[1]]
##        SWC      PI_o psi_TLP  RWC_TLP      eps       C_FT      C_TLP  C_FTStar
## 1 2.438935 -1.399302   -1.75 88.67684 12.20175 0.06456207 0.09923338 0.5161476
# See water mass - water potential graph
# fits[[1]][[2]]

# See PV curve
# fits[[1]][[3]]

# Compile parameter outputs
pars = compile_data(data = fits, output_type = "dataframe", list_element = 1)

# Compile the water mass - water potential graphs
graphs1 = compile_data(data = fits, output_type = "list", list_element = 2)

# Compile the PV graphs
graphs2 = compile_data(data = fits, output_type = "list", list_element = 3)

References

Koide RT, Robichaux RH, Morse SR, Smith CM. 2000. Plant water status, hydraulic resistance and capacitance. In: Plant Physiological Ecology: Field Methods and Instrumentation (eds RW Pearcy, JR Ehleringer, HA Mooney, PW Rundel), pp. 161-183. Kluwer, Dordrecht, the Netherlands.

Sack L, Cowan PD, Jaikumar N, Holbrook NM. 2003. The ‘hydrology’ of leaves: co-ordination of structure and function in temperate woody species. Plant, Cell & Environment 26:1343-1356

Tyree MT, Hammel HT. 1972. Measurement of turgor pressure and water relations of plants by pressure bomb technique. Journal of Experimental Botany 23:267-282.

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
Health stats visible at Monitor.