The entire tree-planting site is divided into an upper part and a lower part. The upper part was originally full of Brisbane Box (Lophostemon confertus), adjacent to a large bamboo grove. Drawing from our experience at nearby planting sites, we selected various shade-tolerant tree seedlings. In contrast, the lower part of the planting site was dominated by white alder trees. The soil there is relatively soft and tends to become waterlogged during the rainy season, creating a marshy area. Consequently, we chose several water-loving tree species, such as Cleistocalyx nervosum and Syzygium levinei.