Convert biomass to Nf and Ns

Converts wet or dry biomass to N_f and N_s via: $$B = \frac{N_f + N_s}{Q_{min}}$$ and where the ratio between N_f and N_s is calculated via: $$\frac{Ns}{Nf} = \frac{Q_{int}}{Q_{min}} - 1$$

Usage

biomass_to_Nf(biomass, Q_int = NULL, Q_rel = 0.5, spec_params, dry = T)

Arguments

biomass

starting biomass, mg m-3

Q_int

Non-dimensionalised internal nutrient quotient

Q_rel

the non-dimensionalised relative internal nutrient quotient (\(Q_{rel}\)). Only one of \(Q_{int}\) or \(Q_{rel}\) need to be provided. If neither \(Q_{int}\) or \(Q_{rel}\) are provided the default if \(Q_{rel}=0.5\) will be used.

spec_params

a vector of named numbers. Must include:

• DWWW (if dry = F), the conversion from dry weight to wet weight

• Q_min, the minimum internal nutrient quotient (mg gDW-1)

• Q_max, the maximum internal nutrient quotient

dry

whether dry (default) or wet biomass is provided, mg m-3

Value

Nf, mg m-3

See also

Nf_to_biomass(), Q_rel(), Q_int()

Examples

my_species <- c(DWWW = 7.5, Q_min = 20, Q_max = 45)
starting_biomass <- 250 # mg m-3

# Using default Q_rel = 0.5
biomass_to_Nf(biomass = starting_biomass, spec_params = my_species, dry = T)
#>    Nf    Ns 
#> 5.000 3.125 

# Using a specific Q_int
biomass_to_Nf(biomass = starting_biomass, Q_int = 30, spec_params = my_species, dry = T)
#>  Nf  Ns 
#> 5.0 2.5