The SLA is calculated for each different PFT by the following equation :
\begin{equation}
SLA =
\begin{cases}
 2.10^{-4}\times 10^{2.29 - 0.4\log(\frac{12}{a_{leaf}})} & \text{if PFT needle-leaf} \\
 2.10^{-4}\times 10^{2.41 - 0.38\log(\frac{12}{a_{leaf}})}
\end{cases} %\]
\end{equation}
where : \\
\begin{itemize}
 \item  $a_{leaf}$ is a PFT-specific value for leaf longevity in days.
\end{itemize}

