By regression analyses, certain soil and topographic features were found to be significantly related to the site index of loblolly, longleaf, and slash pines in southeastern Louisiana. Depth to the least permeable layer in the soil profile, percent sand in the subsoil, and the pH of the subsoil were related to the site index of loblolly pine. Site index of slash pine was related to depth to the least permeable layer, percent sand in the topsoil and in the subsoil, and degree of internal drainage. Longleaf site index was related to the sand content of the subsoil, the slope, and the degree of surface drainage. For each species, the regression equation which involves these variables is recommended for use in estimating the site index of the given pine species on sites for which no soil survey maps are available. The field guide based on soil series and mapping units is recommended for determining the site index when a soil survey map is available.
Document Type: Journal Article
Assistant Professor of Forestry, School of Forestry and Wildlife Management, Louisiana Agric. Expt. Sta., Baton Rouge
Publication date: June 1, 1963
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