birth: LINKAGES birth function

In araiho/linkages_package: A Linked Forest Productivity - Soil Process Model

Description

BIRTH CALCULATES SEEDLING AND SPROUT BIRTH BASED ON SPECIES FECUNDITY, SEEDBED CONDITIONS, SUSCEPTIBILITY TO BROWSING, AND THE DEGREE TO WHICH LIGHT, SOIL MOISTURE, AND DEGREE DAYS ARE LESS THAN OPTIMUM FOR GROWTH. SOIL MOISTURE AND DEGREE DAY MULTIPLIERS ARE SUPPLIED BY SUBROUTINE GMULT. A SPECIES CAN HAVE SPROUTS IF AT LEAST ONE TREE WITH DIAMETER BETWEEN SPRTMN AND SPRTMX DIED LAST YEAR (KSPRT INCREMENTED BY 1 IN KILL). RANDOM NUMBERS USED TO DETERMINE OCCURENCE OF BROWSING, NUMBERS OF SEEDLINGS AND SPROUTS, AND DBH SUPPLIED BY rand.

Usage

birth(nspec, ntrees, frt, iage, slta, sltb, dbh, fwt, switch.mat, degd, dmin,
  dmax, frost, rt, itol, mplant, nogro, ksprt, sprtnd, max.ind, smgf, degdgf)

Arguments

nspec	number of species
ntrees	number of trees of each species
frt	foliage retention time
iage	age of each individual
slta	parameter to calculate crown area from diameter
sltb	parameter to calculate crown area from diameter
dbh	diameter of each individual
fwt	leaf weight per unit crown area
switch.mat	TRUE/FALSE switches for each species
degd	growing degree days from tempe.R
dmin	degree day minimum for each species
dmax	degree day maximum for each species
frost	minimum January temperature tolerated
rt	current monthly temperatures
itol	shade tolerance code for each species
mplant	maximum seeding in rate per plot
nogro	flags individuals that aren't growing well
ksprt	flags individuals that could sprout
sprtnd	number of sprouts per stump
max.ind	maximum number of individuals in a plot
smgf	soil moisture growing factor from gmult.R
degdgf	growing degree day growing factor from gmult.R

Value

iage age of each individual

dbh diameter of each individual

nogro flags individuals growing slowly

ntrees number of trees of each species

newtr records species considered 'eligible'

ksprt flags individuals that could sprout

Author(s)

Ann Raiho

araiho/linkages_package documentation built on Oct. 1, 2019, 6:05 p.m.