Description Usage Arguments Value Examples

A daily sequence of leaf area index is derived from maximum and minimum values, dates and shape parameters using different methods.

1 2 3 4 5 | ```
MakeSeasLAI(method = "b90", year, maxlai, winlaifrac = 0,
budburst.doy = 121, leaffall.doy = 279, emerge.dur = 28,
leaffall.dur = 58, shape.optdoy = 220, shape.budburst = 0.5,
shape.leaffall = 10, lai.doy = c(1, 121, 150, 280, 320, 365),
lai.frac = c(0, 0, 0.5, 1, 0.5, 0))
``` |

`method` |
name of method for generating the sequence. Must be one of "b90", "linear", "Coupmodel" |

`year` |
years to be returned |

`maxlai` |
maximum value during summer |

`winlaifrac` |
fraction of maxlai during winter (ignored when method = 'linear') |

`budburst.doy` |
budburst day of year (ignored when method = 'linear') |

`leaffall.doy` |
day of year when leaf fall begins (ignored when method = 'linear') |

`emerge.dur` |
number of days from budburst until maximum leaf area index is reached |

`leaffall.dur` |
number of days until minimum leaf are index is reached |

`shape.budburst` |
shape parameter for the growth phase (required when method = "Coupmodel") |

`shape.leaffall` |
shape parameter growth cessation (required when method = "Coupmodel") |

`lai.doy` |
integer vector of days of years |

`lai.frac` |
vector of values of fractional leaf area index corresponding to lai.doy (required when method = "linear") |

`opt.doy` |
day of year when optimum value is reached (required when method = "Coupmodel") |

a vector of daily lai values covering the years specified

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 | ```
# leaf area index for a single year
param.b90 <- MakeParam.B90()
plot(MakeSeasLAI(method = "linear",
year = 2001,
maxlai = param.b90$maxlai,
winlaifrac = param.b90$winlaifrac,
budburst.doy = param.b90$budburstdoy,
leaffall.doy = param.b90$leaffalldoy,
emerge.dur = param.b90$emergedur,
leaffall.dur = param.b90$leaffalldur))
plot(MakeSeasLAI(method = "Coupmodel",
year = 2001:2003,
maxlai = param.b90$maxlai,
winlaifrac = param.b90$winlaifrac,
budburst.doy = param.b90$budburstdoy,
leaffall.doy = param.b90$leaffalldoy,
leaffall.dur = param.b90$leaffalldur,
shape.optdoy = 180,
shape.budburst = 0.5,
shape.leaffall = 5))
# leaf area index for multiple years, using multiple values
plot(MakeSeasLAI(method = "linear",
year = 2001:2003,
maxlai = c(6,4,5),
winlaifrac = param.b90$winlaifrac,
budburst.doy = param.b90$budburstdoy,
leaffall.doy = param.b90$leaffalldoy,
emerge.dur = param.b90$emergedur,
leaffall.dur = param.b90$leaffalldur))
``` |

pschmidtwalter/brook90r documentation built on Sept. 26, 2018, 5:17 p.m.

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