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DESIRED RESIDUAL STAND STRUCTURE MARKING GUIDE APPENDIX Z-I Desired Residual Stand Structure Marking Guide for Uneven-Age Northern Hardwood Single Tree Selection Method Example of a typical stand of Northern Hardwood found on the Douglas County Forest Habitat Type: ACL, Site Index: 55 (Sugar Maple), Crops Trees/Acre: 51, Acres: 40 Number of Trees to be Marked by Single-Tree Selection: Q-value 1.6, Desired Residual BA 80ft2, and 20” Maximum DBHe DBH Basal Actual No. No. Desired No. Surplus No. Trees to Percent of Trees Class Area Trees/Acre Trees/Acre to Mark/Acre Mark/DBH Class to Mark/DBH Class Ratio 2” 0.02 10.4 156 4” 0.09 119.7 98 Non-merchantable Size-Classes 6” 0.20 96.2 61 35.2 1,408 37% a 3 : 8 b 8” 0.35 76.3 38 38.3 1,532 50% 1 : 2 10” 0.55 124.3 24 100.3 4,012 81% 4 : 5 12” 0.79 19.5 15 4.5 180 23% 1 : 4 14” 1.07 7.2 9 -1.8 c 0 0 16” 1.40 4.8 6 -1.2 0 0 18” 1.77 2.0 5 -3.0 0 0 20” 2.18 0.9 2 -1.1 0 0 22” 2.64 0.5 0.5 20 100% 1 : 1 24” 3.14 0.1 0.1 4 100% 1 : 1 TOTALS 331.8 d 160 178.9 7,156 a Percent to Mark: 35.2/96.2 = 37% b Three of every eight 6-inch trees can be marked for cut c Deficit DBH class; usually no trees should be marked for cut d Total values are for the merchantable size (DBH) classes through 24”). e All stems over 20” DBH should be marked for removal Actual and Desired Stand Stocking for the Above Stand Using Stand Structure Control 0 20 40 60 80 100 120 140 160 180 2” 4” 6” 8” 10” 12” 14” 16” 18” 20” 22” 24” DBH (inches) Trees Per Acre Actual Stand Desired Stand Surplus Deficit 35.2* 38.3 100.3 4.5 0.5 0.1 * Number of surplus trees per size-class/acre targeted for marking and removal