fweibull: Weibull vulnerability curve

In fitplc: Fit Hydraulic Vulnerability Curves

Description

The Weibull function, as re-parameterized by Ogle et al. (2009), which describes the relative conductivity as a function of the plant water potential. The relative conductivity (relK) is scaled to be 1 when water potential is zero. The slope of relK versus P at the inflection point can be calculated from the shape parameter (SX) as slope = -SX/100.

Usage

fweibull(P, SX, PX, X = 50)

Arguments

P	Water potential (positive-valued MPa)
SX	Shape parameter
PX	Water potential at X loss of conductivity.
X	If 50, PX is the P50.

References

Ogle, K., Barber, J.J., Willson, C., Thompson, B., 2009. Hierarchical statistical modeling of xylem vulnerability to cavitation. New Phytologist 182, 541-554.

Examples

curve(fweibull(x, SX=30, PX=2), from=0, to=5)

Example output

Loading required package: nlme
Loading required package: car

fitplc documentation built on May 2, 2019, 6:11 a.m.