f.gsmax: Maximum theoretical stomatal conductance

In TESTgroup-BNL/LeafGasExchange: A package containing functions for fitting photosynthetic response curves, simulat leaf and canopy photosynthesis

Maximum theoretical stomatal conductance

Description

Maximum theoretical stomatal conductance

Usage

f.gsmax(
  Sarea = 0.78,
  Sdensity = 400,
  Sdepth = 5,
  Diffusivity = 0.282/1000,
  mvair = 24.5/1000
)

Arguments

Sarea	Maximum area of the aperture of stomata when open (microm2).
Sdensity	Number of stomata per mm2 of leaf.
Sdepth	Stomatal pore depth (micro m).
Diffusivity	Diffusivity of water vapor in air (m2 s-1).
mvair	Molar volume of air (m3 mol-1).

Details

This function calculates the maximum theoretical conductance value according to morphological data and the physics of diffusion through pores. It follows the equation from Franks and Berling 2009.

Value

Maximum stomatal conductance to water vapour in mol m-2 s-1

References

Franks PJ, Beerling DJ. Maximum leaf conductance driven by CO2 effects on stomatal size and density over geologic time. Proc Natl Acad Sci U S A. 2009;106(25):10343-10347. doi:10.1073/pnas.0904209106

Examples

## The density of stomata is around 400 stomata.mm-2 in the tropical species.
## The length of the stomata is around 20 micro m. Following Franks and Beerling 2009 we can estimate the
## Sarea of the stomata: pi*(20/4*10^-6)^2 and the Sdepth: 20*10^-6/4.
f.gsmax(Sarea=0.78,Sdensity=400,Sdepth=5)

TESTgroup-BNL/LeafGasExchange documentation built on May 17, 2024, 8:11 p.m.