Wow, these are astonishing. The trees have much shallower roots than I thought. I assumed they went down as deep as the tree is tall! And the smaller plants have much deeper roots than I thought.
And much wider that most people think. Generally the roots of trees are 1,5x to 2x the crown.
Roots need oxygen, going more than a few meters down in the soil and conditions aren't very beneficial anymore. Most of the soil life (and nutrients) are in the top few inches.
