f.ATnotvectorised: Coupled conductance photosynthesis model and energy balance...

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

Coupled conductance photosynthesis model and energy balance model

Description

Coupled conductance photosynthesis model and energy balance model

Usage

f.ATnotvectorised(
  PFD,
  ca,
  Tair,
  RHa,
  wind,
  precision = 0.05,
  max_it = 10,
  param,
  NIR = NA,
  abso_s = 0.5,
  leaf_size = 0.04
)

Arguments

PFD	Photosynthetic light at the leaf surface in micro mol m-2 s-1.
ca	CO2 concentration in the air in ppm.
Tair	Air temperature in Kelvin.
RHa	Relative humidity in the air (between 0 and 100).
wind	Wind speed at the surface of the leaf in m.s-1.
precision	Precision of the leaf temperature prediction. The resolution of the energy balance coupled with the photosynthesis and stomatal conductance is numerical. The smaller the precision, the longer will be the resolution.
max_it	Maximum number of iterations to find the solution.
param	List of parameters given by f.make.param().
NIR	NIR radiation in watt m-2, if not given, then by default the shortwave radiation is calculated as PFD/4.57+NIR = PFD/(4.57*0.45) (see Yun et al. 2020 for the constants 0.45 and 4.57).
abso_s	absorptance of the leaves in shortwave, see documentation of tealeaves package.
leaf_size	Dimension of the leaf in m (see Tealeaves package).

Details

This function allows to calculate the photosynthesis from environmental variables PFD, RH, wind, cs and Tair. The energy balance model is calculated using the package Tealeaves (see reference). The energy balance calculation involves the stomatal conductance and the cuticular conductance. Here the cuticular conductance is considered to be equal to g0.

Value

List of different variables:

- A: Raw assimilation of the leaf in micromol.m-2.s-1.

- Ac: Rubisco limitation assimilation of the leaf in micromol.m-2.s-1.

- Aj: Electron transport rate assimilation of the leaf in micromol.m-2.s-1.

- Ap: TPU rate of the leaf in micromol.m-2.s-1.

- Ag: Gross assimilation in micromol.m-2.s-1.

- Rd: Respiration rate in micromol.m-2.s-1.

- gs: Conductance of the leaf for water vapour in mol m-2 s-1.

- ci: Intracellular CO2 concentration in micromol.mol-1.

- ds: Leaf surface to air vapour pressure deficit in Pa.

- Transp: Water transpiration in mL m-2 s-1.

- gbw: boundary layer conductance in mol m-2 s-1.

- cs: CO2 concentration at the leaf surface in ppm.

- RHs: Relative humidity at the leaf surface (0 100).

- Tleaf: Leaf temperature in K

References

tealeaves: an R package for modelling leaf temperature using energy budgets. Christopher. D. Muir. bioRxiv 529487; doi: https://doi.org/10.1101/529487

Yun, S. H., Park, C. Y., Kim, E. S., & Lee, D. K. (2020). A Multi-Layer Model for Transpiration of Urban Trees Considering Vertical Structure. Forests, 11(11), 1164.

Examples

f.ATnotvectorised(PFD=1500,ca=400,Tair=298,wind=2,RHa=70,param=f.make.param(g0=0.03))

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