f.gsmin: Calculation of the minimal conductance given by a particular...

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

Calculation of the minimal conductance given by a particular coupled conductance and photosynthesis model

Description

The minimal conductance of a model depends on the parameters of the model (ie g0 and g1) but also on the minimum A value, which corresponds to the dark respiration. Knowing the minimal conductance is important because the conductance can become negative and lead to unrealistic values in photosynthesis models

Usage

f.gsmin(
  RdRef = 0.825,
  RdHa = 46390,
  RdHd = 150650,
  RdS = 490,
  Tleaf = 300,
  cs = 400,
  ds = 1000,
  g0 = 0.02,
  g1 = 4.1,
  power = 0.5,
  model = "USO"
)

Arguments

RdRef	Respiration value at the reference temperature in micromol.m-2.s-1.
RdHa	Energie of activation for Rd in J.mol-1.
Tleaf	Leaf temperature in Kelvin
cs	CO2 concentration at the leaf surface in ppm
ds	Leaf to air vapor pressure deficit in Pa
g0	Constant of the conductance model, representing the conductance when A is 0, in mol.m-2.s-1, usually around 0.01.
g1	Slope parameter, between 1.14 and 3.58 KPa^0.5 (Wu et al., 2019).
power	Power of VPDl in USO model. By default power=0.5 as in Medlyn article.
RH	Air relative humidity (0 to 100), only necessary for the BWB stomatal conductance model

Value

Minimum conductance in mol m-2 s-1

Examples

f.gsmin(RdRef=	0.825,RdHa=	46390,RdHd=150650,RdS=490,Tleaf=300,cs=400,ds=1000,g0=0.02,g1=4.1,power=0.5,model="USO")

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