The researchers studied trees in Rwanda to figure out how much carbon they store. They measured the size and density of trees in a plantation forest to create equations for estimating tree biomass. They found that tree diameter is a good indicator of how much biomass a tree has, with height and wood density also playing a role. Stems hold the most biomass, followed by branches and leaves. By using these equations, we can better estimate how much carbon is stored in plantation forests, helping us understand their impact on the environment.