Returns years to breast height (YTBH) for the species retained from
Carmean et al. (1989).
Usage
ytbh_carmean1989(si, species)
Arguments
- si
Numeric vector. Site index (m, base age 50 years at total age).
- species
Character vector of species codes (e.g., `"ACER.SAC"`).
Value
A tibble with one column:
- ytbh
Predicted years to breast height (years).
Details
Model scope (species coverage): this implementation includes only
selected Carmean et al. (1989) species that occur in Canada:
ACER.SAC, BETU.ALL, FAGU.GRA, FRAX.AME, FRAX.NIG, PRUN.SER,
QUER.RUB, TILI.AME, ULMU.AME, CHAM.THY, TSUG.CAN.
For most species, the source provides a fixed years-to-breast-height value
in the figure caption. For Atlantic white-cedar (CHAM.THY), the
source provides a site-index table in feet, and this implementation uses
linear interpolation between the tabulated values.
References
Carmean, W. H., Hahn, J. T., & Jacobs, R. D. (1989). Site index curves for
forest tree species in the eastern United States. U.S. Department of
Agriculture, Forest Service, Northern Research Station.
Examples
ytbh_carmean1989(
si = c(18, 20, 22),
species = c("ACER.SAC", "CHAM.THY", "TSUG.CAN")
)
#> # A tibble: 3 × 1
#> ytbh
#> <dbl>
#> 1 4
#> 2 6.44
#> 3 6