\begin{equation}
Flux_{pool}=
\left\{
  \begin{array}{ll}
	C_{pool}\times\frac{\Delta t}{\tau_{pool}}\times\epsilon_T\times\epsilon_H & \textrm{(natural vegetation)} \\
	C_{pool}\times\frac{\Delta t}{\tau_{pool}}\times\epsilon_T\times\epsilon_H\times 1.2 & \textrm{(C3 crops)} \\
	C_{pool}\times\frac{\Delta t}{\tau_{pool}}\times\epsilon_T\times\epsilon_H\times 1.4 & \textrm{(C4 crops)}
  \end{array}
\right. \nonumber
\end{equation}
,where $C_{pool}$, $\Delta t$, $\tau_{pool}$, $\epsilon_T$ and $\epsilon_H$ are respectively the pool carbon
stock, the time step, the pool turnover time, and two control coefficients
(temperature and humidity) defined in the ::stomate\_litter module
