Most of the non-cellulose elements (the ones nneeded for life) are in the outer layers of the tree. Modern forestry machines strip off the bark and a little of

Most of the non-cellulose elements (the ones nneeded for life) are in the outer layers of the tree. Modern forestry machines strip off the bark and a little of the phloem (the living layer) in situ. But yeah, there is a slow loss. Partly made up by the micrometeorite dust that falls everywhere, and in some places by dusts from other places. For example, the Amazon rainforset is replenished from the Sahara. Deciduous forests are better at this. Deep tree roots break down rocks in the subsoil, recovering minerals that way, and leaf fall creates a realtively rich soil. Undisturbed virgin deciduous forests with deep soils have near 100% mineral recycling. The micrometeorite dust makes up the rest.