Revised white pine stocking guide for managed stands
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NA-TP-01-99. U.S. Department of Agriculture, Forest Service, Northeastern Area State and Private Forestry. 2 p.
Stocking guides are basic tools for forest managers. They provide estimates of the range in acceptable stocking for full occupancy of the site. The first stocking guide for white pine was developed by Philbrook et al (1973). It was of conventional format: showing trees and basal area per acre (in the main crown canopy) by mean stand dbh (the tree of average basal area). The so-called A-line represented maximum stocking, the B-line represented minimum stocking for full site occupancy - the suggested minimum residual stocking after thinning. Lancaster and Leak (1978) incorporated the Philbrook guide into a white pine silvicultural guide with a couple of changes. Whereas Philbrook's A-line was placed at 80% of maximum stocking, the Lancaster and Leak guide placed the A-line at 100% of maximum stocking based on Frothingham's (1914) yield tables. In addition, the Lancaster and Leak guide included a C-line representing the bottom-line minimum stocking, the line where 10 years of growth would raise the stand to the B-line.
Leak, William B.; Lamson, Neil I. 1999. Revised white pine stocking guide for managed stands. NA-TP-01-99. U.S. Department of Agriculture, Forest Service, Northeastern Area State and Private Forestry. 2 p.