It will help the roots divide to fill up the space of the entire pot. With hundreds of tiny roots, the tree can rehydrate betterand stay healthy.
Regular potting soil causes tree roots to grow long and spiral around the bottom. It can also cause root rot and kill the tree.
Interesting brother thanks a mil, I was just worried about nutrients or the lack thereof in that soil? Cheer$;)
The pine bark chips you have will help with that.
For a purely inorganic soil mix, the Japanese have perfected the method, and discovered the best bonsai soil. Add akadama clay to the rocky mix. It will hold nutrients, absorb water, and it causes roots to divide smaller. It is a bit expensive to ship, but it will help in the long term.