Nodal Farming

Trees in a forest are nodes. The older the tree, the more likely it has many connections to mycorrhizal networks. If seedlings can "plug into" a pre-existing fungal network they have a more robust growth pattern.

If the "old" nodes in a forest are destroyed by, say, logging then the entire fungal network is diminished and seedlings are less likely to find a fungal partner to plug in to and therefore have a less robust growth pattern.

It's actually in a logging company's best interest to leave the old growth trees as nurse-maids, plant seedlings among them, and then harvest those young trees an a few years time. They will grow faster and have better structure than seedlings planted on a clear cut site with no fungal network to plug in to.