Basal Area (BA) definition

Basal Area (BA) the cross section area of a tree stem in square feet commonly measured at breast height (4.5' above ground) and inclusive of bark, usually computed by using dbh or tallied through the use of basal area factor angle gauge or a factored prism. Only trees with 10.0” ▇▇▇▇▇ diameter and above will be counted when determining leave basal area. Do not include any hardwoods when determining leave basal area unless noted in exceptions in individual unit cutting guide.
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Basal Area (BA) the cross section area of a tree stem in square feet commonly measured at breast height (4.5' above ground) and inclusive of bark, usually computed by using dbh or tallied through the use of basal area factor angle gauge or a factored prism. Only trees with 7.0” dbh and above will be counted when determining leave basal area. Do not include any hardwoods when determining leave basal area unless noted in exceptions in individual unit marking guide. Clumps: 2-5 > 7.0” dbh leave trees (unless noted in individual prescription) with ▇▇▇▇▇ within 0- 20’ measured stem face to stem face at dbh. Created Openings: 3 or more contiguous acres with less than 20 TPA. Boundary of opening will be measured from last leave tree at opening edge to determine acreage of opening. Diameter at Breast Height (dbh): measured at 4.5 feet above the natural forest floor on the high side of the tree, rounded down to the nearest 1/10th inch. receiving full light from above and partly from the sides.
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Examples of Basal Area (BA) in a sentence

  • The Forest Service will provide a table to the contractor showing the approved Basal Area (BA) removal by species for each cutting unit.

  • Retain vigorous well-formed White Fir to a residual Basal Area (BA) between 40-60 sq ft per acre, with retention preference for healthy trees between 5 and 12 inches DBH.

  • Basal Area (BA) Individual plot BA must range from 50 to 70 square feet per acre.

  • Acceptable cutting should meet the criteria in C2.355# for Basal Area (BA) and Trees per Acre (TPA).

  • Select dominant or co-dominant DF trees with the largest DBH and LCR for Target Basal Area (BA) Retention, unless other trees can be selected pursuant to the criteria specified herein.

  • Ponderosa pine and mixed conifer stands will be mechanically thinned to the appropriate Basal Area (BA) based on appropriate targets identified by CEQA environmental guidelines and clearances.