B) Calculating below-ground biomass (root biomass)
In order to calculate root biomass, we used equation 4, in which RGB
stands for below-ground biomass and AGB stands for above-ground biomass
(sum of trunk and crown biomass) (West and West, 2009, Ximenes et al.,
2008, Xue et al., 2016).
\begin{equation}
BGB=Volume\ AGB\ \times 0.2\text{\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ }Eq.4\nonumber \\
\end{equation}