habitatvars: Derives vegetation paramaters from habitat type

In ilyamaclean/microctools: Various worker functions for microclimc package

Derives vegetation paramaters from habitat type

Description

habitatvars generates vegetation parameters required to run the model from habitat type.

Usage

habitatvars(habitat, lat, long, tme, m = 20, PAIt = NA)

Arguments

habitat	a character string or numeric value indicating the habitat type. See habitats()
lat	a single numeric value representing the mean latitude of the location for which the solar index is required (decimal degrees, -ve south of the equator).
long	a single numeric value representing the mean longitude of the location for which the solar index is required (decimal degrees, -ve west of Greenwich meridian).
tme	a single value or vector of POSIXlt objects of date(s) and time(s). See details
m	number of canopy nodes
PAIt	optional single numeric value or vector of values of total plant area index for canopy (see details).

Details

if tme is a single value PAI and pLAI are vectors of length m giving Plant Area Index values and proportions of green vegetation for each canopy node m. If tme is a vector of times, PAI and pLAI are arrays of dimension m x length(tme). I.e. seperate PAI and pLAI values are derived for each time interval and node. If PAIt is provided, and a single value, then the length of tme is ignored and returned PAI is a vector of values for each node. If PAIt is a vector of values of length m then seasonally adjusted values for each node and time inteval of tme are returned. If PAIt is a vector of values of any length other than m spline interpolated values for each node and time interval of tme are returned. If PAIt is NA (the default) PAI is estimated from habitat and location using PAIfromhabitat().

Value

a list with the following components:

hgt height of vegetation (m)

PAI a vector or array of Plant Area Index values (see details)

x the ratio of vertical to horizontal projections of leaf foliage

lw mean leaf width (m)

cd drag coefficient

iw a vector of length m of relative turbulence intensities

hgtg height of understory vegetation (m)

zm0 roughnes length governing momentum transfer of understory vegetation (m)

pLAI a vector or array of proportions of green vegetation (see details)

refls reflectivity (shortwave radiation) of leaves

refg reflectivity (shortwave radiation) of ground

refw reflectivity (shortwave radiation) of dead vegetation and woody stems

reflp # Reflectivity of leaves to photosynthetically active radiation

vegem thermal emissivity of vegetation

gsmax maximum stomatal conductance (mol / m^2 / s)

q50 Value of PAR when photosynthetically active radiation is at 50% of maximum (micromoles / m^2 / s^1)

thickw a vector of length m of mean thickness (m) of vegetation such that thickw x PAI = volume of vegetation (m^3 / m^3)

cpw Specific heat capacity of woody vegetation (J / kg / K)

phw Density of woody vegetation (no air) (kg / m^3)

kwood Thermal conductivity of wood (W / m / K)

clump Clumpiness factor for canopy (0-1)

ilyamaclean/microctools documentation built on Jan. 25, 2023, 5:29 a.m.