CHAPTER 11: UNEVEN-AGED REPRODUCTION METHODS
FIGURE 11-5
Group selection method removes clusters of adjacent mature trees,
brightening the ground sufficiently for species with middle to low shade
tolerance. As with this cutting in an uneven-aged ponderosa pine pine
stand, foresters also tend immature family groups between the
openings, maintaining a balance among the age classes and
concentrating the growth on the best trees.
Group selection system -- before cut
Group selection system -- after cut
FIGURE 11-6
Group selection method removes clusters of adjacent mature
trees from a predetermined proportion of the stand area,
leaving fairly large openings, and setting the stage for a new
age class to form in groups rather than dispersed uniformly
across the stand. Simultaneous tending must reduce crowding
within each group of older trees to maintain their vigor and
concentrate growth on the best ones.
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