tissuemoisture: Tissue moisture functions

Description

Set of functions used to calculate tissue moisture from water potential and viceversa.

Usage

moisture_symplasticRWC(psiSym, pi0, epsilon)
moisture_symplasticPsi(RWC, pi0, epsilon)
moisture_apoplasticRWC(psiApo, c, d)
moisture_apoplasticPsi(RWC, c, d)
moisture_turgorLossPoint(pi0, epsilon) 
moisture_tissueRWC(psiSym, pi0, epsilon, 
                   psiApo, c, d, 
                   af, femb = 0)
moisture_pressureVolumeCurvePlot(x, segment="leaf", 
                    fraction = "all",
                    psiVec =  seq(-0.1, -8.0, by =-0.01),
                    speciesNames = FALSE)
moisture_sapwoodWaterCapacity(Al2As, height, V, L, wd)
moisture_leafWaterCapacity(SLA, ld)

Value

Values returned for each function are:

moisture_symplasticRWC: Relative water content [0-1] of the symplastic fraction.
moisture_apoplasticRWC: Relative water content [0-1] of the apoplastic fraction.
moisture_symplasticWaterPotential: Water potential (in MPa) of the symplastic fraction.
moisture_apoplasticWaterPotential: Water potential (in MPa) of the apoplastic fraction.
moisture_turgorLossPoint: Water potential (in MPa) corresponding to turgor loss point.
moisture_segmentRWC: Segment relative water content [0-1].

Arguments

psiSym, psiApo: Symplastic or apoplastic water potential (MPa).
RWC: Relative water content [0-1].
pi0: Full turgor osmotic potential (MPa).
epsilon: Bulk modulus of elasticity (MPa).
c,d: Parameters of the xylem vulnerability curve.
af: Apoplastic fraction (proportion) in the segment (e.g. leaf or stem).
femb: Fraction of embolized conduits.
x: An object of class spwbInput.
segment: Segment whose relative water content curve to plot, either "stem" or "leaf".
fraction: Tissue fraction, either "symplastic", "apoplastic" or "all".
psiVec: Vector of water potential values to evaluate for the pressure-volume curve.
speciesNames: A flag to indicate the use of species names instead of cohort names in plots.
L: Vector with the length of coarse roots (mm) for each soil layer.
V: Vector with the proportion [0-1] of fine roots within each soil layer.
Al2As: Leaf area to sapwood area (in m2·m-2).
height: Plant height (in cm).
SLA: Specific leaf area (mm2·mg-1).
wd: Wood density (g·cm-3).
ld: Leaf tissue density (g·cm-3).

Author

Miquel De Cáceres Ainsa, CREAF

References

Bartlett, M.K., Scoffoni, C., Sack, L. 2012. The determinants of leaf turgor loss point and prediction of drought tolerance of species and biomes: a global meta-analysis. Ecology Letters 15: 393–405.

Hölttä, T., Cochard, H., Nikinmaa, E., Mencuccini, M. 2009. Capacitive effect of cavitation in xylem conduits: Results from a dynamic model. Plant, Cell and Environment 32: 10–21.

Martin-StPaul, N., Delzon, S., Cochard, H. 2017. Plant resistance to drought depends on timely stomatal closure. Ecology Letters 20: 1437–1447.

Examples

Run this code

psi = seq(-10,0, by=0.1)
rwc_s = rep(NA, length(psi))
for(i in 1:length(psi)) rwc_s[i] = moisture_symplasticRWC(psi[i],-3,12)
plot(psi, rwc_s, type="l", xlab="Water potential (MPa)", ylab = "Symplasmic RWC")

Run the code above in your browser using DataLab