Linked from
The 52 pages that link to Canopy, each with the reason it gives.
MicroclimateBroader topic: Its sheltered air can differ from the air above rooftops or tree crowns.
Temperate rainforestBroader topic: Its dense, layered crowns create shaded, humid conditions below.
Tropical forestBroader topic: Canopy height and layering help define tropical forest structure.
LianaBroader topic: Lianas use trees to reach and spread through this high-light layer.