The study looked at how the quality of the land affects the growth of Machilus thunbergii trees in a plantation in southern Korea. They found that trees on better land grew taller and had more biomass than trees on poorer land. The equations used to estimate tree biomass were different depending on the quality of the land, but overall, the biomass of the trees could be estimated accurately regardless of land quality. The density of stems in the trees was similar between good and poor land, but the biomass expansion factors for aboveground tree and leaf biomass were higher in trees from poorer land. This shows that the quality of the land can affect the growth and biomass of Machilus thunbergii trees.