I guess that (1) there are enough other roots in the ground, and (2) the root in the air may be able to extract humidity the air, and also water directly when it rains. Not sure what species this is but in some trees roots also have the function to help with stability, like extra stems.
![Tree with roots (Kuala Lumpur) [OC]](https://mander.xyz/pictrs/image/ed1b358e-b865-484d-9e5d-319ef80342f4.jpeg){kind=link}
I guess that (1) there are enough other roots in the ground, and (2) the root in the air may be able to extract humidity the air, and also water directly when it rains. Not sure what species this is but in some trees roots also have the function to help with stability, like extra stems.