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The Dual Arrhenius and Michaelis-Menten (DAMM) kinetics model in ClimaLand.jl follows Davidson et al. 2012. DAMM models heterotrophic respiration ($Rh$) as a function of soil temperature ($T_s$) and soil moisture ($\theta$).
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The rate of respiration, $Rh$, is expressed as:
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| Volumetric fraction of $O_2$ in the soil air content | $O_{2_a}$ | - | 0.005--0.5 |
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| Fraction of soil carbon that is considered soluble | $p_{s_x}$ | - | 0.005--0.5 |
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| Soil organic C | $C_{som}$ | kg C $m^{-3}$ | 1.0--10.0 |
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| Constants | Symbol | Unit | Value |
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| :--- | :---: | :---: | :---: |
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| Air-filled porosity at soil water potential of -100 cm H₂O (~ 10 Pa) | $O_{a100}$ | - | 0.1816 |
where $\beta$ is the moisture stress factor which is related to the mean soil moisture concentration in the root zone and R$_d$ is the leaf dark respiration calculated as
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where $\beta$ is the moisture stress factor which is related to the mean soil moisture concentration in the root zone and R$_d$ is the leaf dark respiration calculated as
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```math
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\begin{align}
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R_{d,25}(\psi_l) &= f V_{cmax,25}\beta(\psi_l), \nonumber \\
Copy file name to clipboardExpand all lines: docs/src/standalone/pages/vegetation/radiative_transfer/beer_model.md
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# Radiative transfer scheme
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This section describes multiple models of radiative transfer
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through the vegetation canopy, implemented in ClimaLand.
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This section describes multiple models of radiative transfer
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through the vegetation canopy, implemented in ClimaLand.
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## Beer's law
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Plants utilize Photosynthetically Active Radiation (PAR) for the process of photosynthesis, during which they convert light energy into chemical energy, fueling the synthesis of sugars and other organic compounds. PAR refers to the portion of the electromagnetic spectrum that is essential for photosynthesis in plants. PAR includes wavelengths ranging from approximately 400 to 700 nanometers and corresponds to the visible light spectrum. The unit used to measure PAR is called micromoles per square meter per second (μmol/m²/s), representing the number of photons within the PAR range that strike a square meter of a surface per second.
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