birth: LINKAGES birth function

Description Usage Arguments Value Author(s)

View source: R/birth.R

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

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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 July 18, 2018, 4:07 a.m.