Sunlight comes through open forests

Microorganisms become active and underlayer plants grow.

Wild broad-leaved trees suitable for the climate grow naturally.

By mostly single tree single layer, sunshine become screened off.
(Poor and weak forest )
Underlayer plants can rarely exist.

Sunlight comes through open forests
Microorganisms become active and underlayer plants grow
Wild broad-leaved trees suitable for the climate grow naturally.
Healthy mixed forests grow.
Biological diversity evolves.
Proper future trees grow better