chemicals in tree bark compared to wood

I burned tree bark in the fireplace for the past week to see how it burns relative to wood.
But what I noticed most of all is the amount of ash left behind by
bark. It is about 3 times more ash than burning wood.
What is in bark that it leaves so much ash behind?
Archimedes Plutonium www.iw.net/~a_plutonium whole entire Universe is just one big atom where dots of the electron-dot-cloud are galaxies
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