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GIRDLING - A physical cutting or disruption of the cambial sap flow within a tree. Girdling by humans, animals, or insects can often kill a tree.
GREEN TREE RESERVOIR (GTR) - A wooded area that has been intentionally flooded to benefit migratory ducks and waterfowl. GTRs may be planted with a grain crop, such as millet, the summer before the winter flooding. The GTR can be an effective, low-cost method of luring waterfowl into forested tracts.
GROUP SELECTION - (a) The removal of small groups of trees to regenerate shade-intolerant trees in the opening (usually at least 1/4 acre). (b) A specific type of selective cutting.
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