Growth Layer Profiles (GLP) describe the vertical distribution of secondary growth along the main stem of a tree. Secondary growth is generally defined as the amount of new xylem material originating from the thin layer of cambial cells found just under the layer of bark tissue throughout the surface of the main stem. With GLP's, secondary growth can be measured either one-dimensionally (i.e., width of an annual ring) or in two dimensions (i.e., area of an annual ring).

General "rules" about the vertical distribution of secondary growth include:

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Last Updated by E.Bevilacqua 8/24/99