standard_globals: Standard values for global parameters

In TTR.PGM: Thornley Transport Resistance Plant Growth Model

Standard values for global parameters

Description

This vector contains the global parameter values for the process model, which must be supplied to the make_data() function. The time components are the units are per modelled time step and the length of these time steps are defined by the parameter seconds in make_data(). In the descriptions below M indicates dry mass of structural biomass (either shoot mass MS or root mass MR).

Usage

standard_globals

Format

An object of class numeric of length 13.

Units

mmax

Loss coefficient, per timestep (kg / kg M per timestep)

gmax

Growth coefficient, in (kg C kg N kg M^-2)^-1 per timestep

KM

Size dependency of mass-loss (kg M)

CUmax

Carbon uptake rate (kg C / kg shoot M per timestep)

NUmax

Nitrogen uptake rate (kg N / kg shoot M per timestep)

KA

Size dependency of uptake rates (kg M)

Jc

Substrate inhibition coefficient for carbon (kg C / kg M)

Jn

Substrate inhibition coefficient for nitrogen (in kg N / kg M)

q

Scaling coefficient for substrate transport, no units

RHOc

Specific carbon transport resistance, per timestep

RHOn

Specific nitrogen transport resistance, per timestep

Fc

Fraction of carbon in M (kg C / kg M)

Fn

Fraction of nitrogen in M (kg N / kg M)

TTR.PGM documentation built on June 8, 2025, 9:32 p.m.