TapeS (version 0.13.3)

nsur: Component biomass functions

Description

evaluation of the component biomass functions fit by nonlinear seemingly unrelated regression (NSUR) to estimate absolute or relative component mass

Usage

nsur(spp, dbh, ht, sth, d03, kl)

Value

a numeric matrix holding component biomass

Arguments

spp

vector of species code for biomass component function of interval [1;8]; see BaMap for mapping of species model codes

dbh

vector of diameter in breast height; in centimeter

ht

vector of tree heights, in meter

sth

vector of stump heights, in meter

d03

vector if diameter in 30% of tree height, in centimeter

kl

vector of crown length, i.e. tree height minus height of crown base, in meter

Details

function to calculate component biomass; functions fitted using same methodology as in Vonderach et al. (2018) with slightly updated parameters as in Vonderach and Kändler (2021); species mapping as in TapeS::BaMap(, type=7);

References

Vonderach, C., G. Kändler and C. F. Dormann (2018). "Consistent set of additive biomass functions for eight tree species in Germany fit by nonlinear seemingly unrelated regression." Annals of Forest Science 75(2): 49. tools:::Rd_expr_doi("10.1007/s13595-018-0728-4")

Vonderach, C. and G. Kändler (2021). Neuentwicklung von Schaftkurven- und Biomassemodellen für die Bundeswaldinventur auf Basis des TapeR-Pakets - Abschlussbericht zum Projekt BWI-TapeR. Freiburg: 150p.

Examples

nsur(spp = c(1, 6),
     dbh = c(30, 30),
     ht = c(25, 27),
     sth = c(0.25, 0.27),
     d03 = c(27, 27),
     kl = .7*c(25, 27))