Why is the soil in forest plantations populated with mycorrhizal fungi?

Young trees come into symbiosis with mushrooms: mycelium of mushrooms, braiding the roots of plants, give them water and salt, which improves the growth of trees, they tolerate drought more easily.
1) Trees come into symbiosis with mushrooms.
2) Mycelia of mushrooms, braiding the roots of plants, give them water and salt, which improves the growth of trees

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