GENOTYPE – Growth or development characteristics dependent on genetic information. The genetic constitution of an organism or a species in contrast to its observable characteristics.
- GEOGRAPHIC INFORMATION SYSTEM (GIS) – A computer system that creates maps using a Global Positioning System (GPS). These maps are linked then to a database that stores important information about them.
- 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.
- GLOBAL POSITIONING SYSTEM (GPS) – A computer that uses satellites in space to pinpoint where you are on the earth.
- 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.
- GROWING STOCK – Sum (by number or volume) of all the trees in a forest or in a specified part of the forest.
- GROWTH RINGS – Also called annual rings, these are the layers of wood a tree adds each season. These rings frequently are visible when a tree is cut and can be used to estimate its age and growth rate.
- GROWTH – Increase in diameter, basal area, height, and volume of individual trees or stands during a given period of time. Also known as increment.