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GBA Curve Validation
GBA and Basal Area Growth
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adjusted to dominant-tree area/diameter growth data BA per acre Barrett basal area/diameter growth base age 100 calculated confidence interval Curtis Dahms decreases DIAMETER GROWTH Figure diameter growth rate dominant trees dominant-tree diameter growth Douglas-fir Dq diameter growth Edminster equation 9 estimate factor fir curve fir GBA curve forest ft base age ft/yr ft2 BA/A GBA averaged GBA slide rule grand fir growing growth increases growth per acre growth was adjusted height growth illus in/dec inch radius growth inches dbh increment core leaf area index lodgepole pine maximum mean annual increment measured percent pine and fir pine GBA curve plot ponderosa pine precommercial thinning quadratic mean Range Exp rate of diameter sampling Seidel Sl class species stand age stand BA growth stand BA/A stand density stand growth stockability stocking tree diameter growth tree growth trees per acre USDA western larch white fir