Get default allometric parameters for pinyon-juniper woodland — get_default_allometric

Returns a list of allometric parameters for common pinyon-juniper species. Users can modify these parameters or create new parameter sets for different forest types.

Usage

get_default_allometric_params(use_reese_cbh = TRUE, use_miller_foliage = TRUE)

Arguments

use_reese_cbh: Logical. If TRUE, uses Reese's quadratic CBH equations (more realistic crown shapes). If FALSE, uses simple linear CBH = 0.4*H. Default is TRUE.
use_miller_foliage: Logical. If TRUE, uses Miller et al. (1981) published foliage biomass equations. If FALSE, uses generic crown volume approach. Default is TRUE.

Value

List containing species-specific parameters:

crown_radius: Parameters for crown radius (m) = a + b * DBH
height: Parameters for height (m) = 1.3 + a * (1 - exp(-b * DBH))
crown_ratio: Parameters for crown ratio = a - b * log(DBH)
crown_mass: Parameters for crown mass (kg) = a * DBH^b
cbh_method: Method for crown base height calculation
cbh_reese: Reese quadratic coefficients (if use_reese_cbh = TRUE)
foliage_method: Method for foliage biomass calculation
foliage_miller: Miller et al. coefficients (if use_miller_foliage = TRUE)

References

Reese et al. Crown base height equations for pinyon-juniper species. Miller, Meeuwig & Budy (1981). USDA Forest Service INT-273.

Examples

# Get default parameters with improved equations
params <- get_default_allometric_params()

# Use simple equations instead
params_simple <- get_default_allometric_params(
  use_reese_cbh = FALSE,
  use_miller_foliage = FALSE
)

# Modify for your own species
custom_params <- params
custom_params$crown_radius$PIPO <- list(a = 0.5, b = 0.10)