fCO2_growth_mod

Function describing the effects of elevated CO2 on growth.

Run grass growth simulations using a grass growth model based
on ModVege (Jouven, M., P. Carrère, and R. Baumont "Model Predicting
Dynamics of Biomass, Structure and Digestibility of Herbage in Managed
Permanent Pastures. 1. Model Description." (2006)
<doi:10.1111/j.1365-2494.2006.00515.x>). The implementation in
this package contains a few additions to the above cited version of ModVege,
such as simulations of management decisions, and influences of snow cover.
As such, the model is fit to simulate grass growth in mountainous
regions, such as the Swiss Alps. The package also contains routines for
calibrating the model and helpful tools for analysing model outputs and
performance.

Kevin Kramer

growR

Implementation of the Vegetation Model ModVege

fCO2_growth_mod function

<dl><dt>c_CO2</dt>
<dd>numeric Atmospheric CO2 concentration in ppm</dd>
<dt>b</dt>
<dd>numeric Strength of CO2 effect on growth. Kellner et al. report
values bewtween 0 and 2 with the interval of highest likelihood
(0.1, 0.3). However, Soltani and Sinclair discuss that b = 0.4 in C4 plants
and b = 0.8 in C3 plants. The difference on the output of this function
of choosing a small (0.1) and large (0.8) value for b has an effect on
the result for an atmospheric concentration of 700 ppm of roughly 40
percent!.</dd>
<dt>c_ref</dt>
<dd>numeric Reference CO2 concentration in ppm.</dd></dl>

Arguments

CO2 growth modifier — fCO2_growth_mod

<dl>

<dt>c_CO2</dt>
<dd>numeric Atmospheric CO2 concentration in ppm</dd>


<dt>b</dt>
<dd>numeric Strength of CO2 effect on growth. Kellner et al. report
values bewtween 0 and 2 with the interval of highest likelihood
(0.1, 0.3). However, Soltani and Sinclair discuss that b = 0.4 in C4 plants
and b = 0.8 in C3 plants. The difference on the output of this function
of choosing a small (0.1) and large (0.8) value for b has an effect on
the result for an atmospheric concentration of 700 ppm of roughly 40
percent!.</dd>


<dt>c_ref</dt>
<dd>numeric Reference CO2 concentration in ppm.</dd>

</dl>

fCO2_growth_mod: CO2 growth modifier

Description

Usage

Arguments

Details

References

Examples