# Characterization of Congolese Woody Biomass and Its Potential as a Bioenergy Source
## 3 Results  
### Estimation of AboveGround Biomass (AGB)  
Table 1 presents the estimated AGB forest biomass for various species inventoried in the Nguela village area. The results indicate that species WB1, despite having a smaller diameter of 614.01 cm, possesses a high AGB value of 4.67 tC/ha and significant carbon stock. In contrast, species WB5, with a much larger diameter of 1854.6 cm, also shows high AGB values of 4.93 t, 9.85 t/ha, and 4.62 tC/ha. Although the AGB values for the first two species are slightly different, WB1 has a higher AGB value overall.  
Compared to WB5 and WB3, which have very large diameters, WB1 has a much smaller diameter. However, WB1 shows a high AGB and contains more carbon than both WB5 and WB3. Additionally, while WB2 and WB4 have smaller diameters, WB2 has a slightly larger diameter, higher AGB, and greater carbon content than WB4.  
Table 2 shows the estimated savannah biomass calculated in t, t/ha, and the carbon stock calculated in tC/ha of the species. The result shows a very high diameter value (645.28 cm) of the WB6 and has a very high potential in AGB (7.28t), (14.55 t/ha), a high (14.55 t/ha) and a high carbon stock (6.84 tC/ha). The values of our study are lower than the value reported by [20].  
Table 3 presents the statistical analysis conducted on the woody biomass (WB). First, the mean diameter is relatively high, but the large standard deviation (784.49 cm) indicates a wide variation in tree sizes. The minimum and maximum values reveal a heterogeneous  
\begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Species** & **Diameter (cm)** & **AGB (t)** & **AGB (t/ha)** & **Carbon Stock (tC/ha)** \\ \hline _WB1_ & 614.01 & 4.97 & 9.94 & 4.67 \\ _WB5_ & 1854.6 & 4.93 & 9.85 & 4.62 \\ _WB3_ & 1259.8 & 2.63 & 5.28 & 2.48 \\ _WB2_ & 48.4 & 0.92 & 0.59 & 1.55 \\ _WB4_ & 62.6 & 0.09 & 0.18 & 0.76 \\ \hline \hline \end{tabular}
\end{table}
Table 1: Aboveground biomass (AGB) potential of forest biomass in t, t/ha and the carbon stock in tC/ha by the diameter of the species.  
\begin{table}
\begin{tabular}{c c c c} \hline \hline
**Species** & **Diameter (cm)** & **AGB (t)** & **AGB (t/ha)** & **Carbon Stock (tC/ha)** \\ \hline _WB6_ & 645.3 & 7.28 & 14.55 & 6.84 \\ \hline \hline \end{tabular}
\end{table}
Table 2: Aboveground biomass (AGB) potential of savannah biomass in t, t/ha and the carbon stock in tC/ha and the diameter (cm) of the species.  
forest, with young trees having a diameter of 48.4 cm and very mature trees reaching up to 1854.6 cm. This variability is typical in natural or old-growth forests where trees of different sizes coexist.  
The find of the mean aboveground biomass of a tree is 2.708 tonnes, but the large standard deviation (2.24226 tonnes) indicates significant variability. Some trees have very low biomass (young trees or small species), while others reach almost 5 tonnes. This uneven distribution of biomass is typical of diversified ecosystems.  
Aboveground biomass per hectare also varies widely, with a mean of 5.168 t/ha and a standard deviation almost as high as the mean. Low values (0.18 t/ha) could correspond to recently degraded, deforested, or sparsely wooded plots, while high values (up to 9.94 t/ha) are typical of dense, well-developed plots.  
The mean carbon stock is 2.816 tC/ha, indicating that, on average, each hectare of forest contains about 2.8 tonnes of carbon. The moderate standard deviation (1.77725 tC/ha) shows some variability in the carbon storage capacity of forest plots. Low values (0.76 tC/ha) are associated with degraded areas or young forests, while high values (4.67 tC/ha) reflect more mature areas with high density and large, well-developed trees.