Tree

1. the roots of the tree with Lord Brahma (the creator of the universe), 
2. the trunk of the tree with Lord Vishnu (the protector and preserver), and 
3. the leaves of the tree with Lord Shiva (the destroyer).

http://www.speakingtree.in/search/brahma-vishnu-shiva

Source
http://6tri.blogspot.com/search/label/SkandaPurana