Introduction to board roots: In tropical rain forests, there are many tall upper trees with large crowns. Without a strong root system as a foundation, these trees will be top-heavy and unstable. In order to facilitate the breathing of the root system and support the tall crown, some trees choose to extend their stem roots to all sides to strengthen themselves, thus forming a very spectacular sight of large roots in the rainforest. The most typical one is the large root of the silver leaf tree, which is tall and wide, like a high gray wall.