Species-specific growth adjustment - Investments into roots

The root investment factor $R O O T_{t s}$ [-], which reduces growth, is described by:

\begin{aligned} R O O T_{t s} & = R O O T_{r s a, t s} \cdot R O O T_{a m c, t s} \\ R O O T_{r s a, t s} & = 1 - κ_{R O O T, r s a} + κ_{R O O T, r s a} \cdot \exp (\frac{\log (0.5)}{ϕ_{T R S A} \cdot T R S A_{t s}}) \\ R O O T_{a m c, t s} & = 1 - κ_{R O O T, a m c} + κ_{R O O T, a m c} \cdot \exp (\frac{\log (0.5)}{ϕ_{T A M C} \cdot T A M C_{t s}}) \\ T R S A_{t s} & = \frac{B_{B, t s}}{B_{t s}} \cdot r s a_{s} \\ T A M C_{t s} & = \frac{B_{B, t s}}{B_{t s}} \cdot a m c_{s} \end{aligned}

$ϕ_{T R S A}$ reference trait value [m² g⁻¹]
$ϕ_{T A M C}$ reference trait value [-]
$κ_{R O O T, r s a}$ maximum reduction in growth [-]
$κ_{R O O T, a m c}$ maximum reduction in growth [-]

Visualization

growth reduction due to investment in root surface area per total biomass

maximum growth reduction (κ_ROOT_rsa)	0.2
reference trait value (ϕ_TRSA)	0.15

growth reduction due to investment in arbuscular mycorrhizal colonisation rate per total biomass

maximum growth reduction (κ_ROOT_rsa)	0.2
reference trait value (ϕ_TAMC)	0.2

API

GrasslandTraitSim.root_investment! Function

julia

root_investment!(; container)

Growth reducer due to cost of investment in roots and mycorriza.