Shelterwood prescription: 
A forest management technique used in Ontario to grow new trees under the protection of older ones. Here's the oversimplified version:

Step 1: Prep the forest: Some trees are removed to create gaps that let sunlight through, helping seedlings grow.
Step 2: Grow baby trees: The older trees left standing "shelter" the young ones by protecting them from harsh weather and giving them shade.
Step 3: Gradual removal: Once the young trees are strong enough, the remaining older trees are cut down to make room for the new forest.


Selection cycle:
Trees are often removed based on desirable characteristics such as size, form, or growth rate. Repeated removal of these preferred individuals can reduce genetic diversity by preventing certain traits from being passed on.
Other management actions, such as selecting specific trees for propagation or introducing new genetic material during artificial regeneration, also influence genetic composition. For sustainable forest management, maintaining natural levels of genetic diversity must be a key objective.


Clearcut:  
Most or all overstory trees are removed within a short time period to create a fully exposed microenvironment. This approach promotes the establishment of a new, even-aged stand, with regeneration developing under conditions of greater than 70% full sunlight.