LIFE HISTORY OF SHORTLEAF PINE. 



41 



table. Tables 16, 17, and 18 have been thus prepared by measuring 

 portions of well-stocked second-growth or old-field stands of known 

 age and quality of natural environment, particularly character of soil 

 and moisture supply. For example, the average yield of 50-year-old 

 stands on the best class of sites in North Carolina (Table 16) is about 

 23,700 board feet, on medium or average sites 17,000, and on the 

 poorest sites about 10,300 board feet. Table 18 shows yields in the 

 Arkansas region at 50 years of 37,200, 23,750, and 12,200 board feet, 

 respectively, on the three qualities of site. The original figures for 

 North Carolina were secured from 80 selected sample tracts with an 

 area of 21.6 acres, which may be considered fairly representative. 

 The data for Table 18 are insufficient in amount, hence the table is 

 tentative and has been included for the purpose of comparison and 

 correction when more measurements become available. 



Table 16. — Yield of well-stocked second-growth shortleaf pine in North Carolina. 1 



[Based on 80 sample plots in well-stocked stands; total area, 21.6 acres. Saw timber scaled to 6 inches in 

 top diameter; stump height, 1 to 1.5 feet. Volume of stem is from 1-foot stump to 6-inch top diameter, 

 including bark. All trees 6 inches and over diameter breast high were scaled.] 



QUALITY I. 





Trees 

 per acre. 



Average 



diameter 



breast 



high. 



Average 

 height. 



Total 

 basal 

 area. 



Yield per acre. 



Age (years). 



Saw timber. 



Solid 

 contents. 





Scribner 

 rule. 



Doyle 

 rule. 



10 



2,940 

 1,760 

 1,000 

 675 

 510 

 410 

 340 

 280 

 235 

 200 

 165 

 140 

 120 

 100 

 90 



Inches. 



2.8 



4.4 



5.8 



6.9 



7.9 



8.8 



9.6 



10.4 



11.2 



11.9 



12.7 



13.4 



14.1 



14.7 



15.3 



Feet. 

 22 

 32 

 40 

 46 

 51 

 55 

 59 

 63 

 66 

 69 

 72 

 74 

 77 

 79 

 81 



Sq. ft. 

 104 

 135 

 158 

 175 

 188 

 198 

 205 

 211 

 215 

 218 

 220 

 222 

 224 

 226 

 227 



Bd.ft. 



400 



3,000 



5,700 



8,400 



11,200 



14,000 



17,100 



20,300 



23, 700 



27,000 



30,100 



33, 200 



36,100 



38, 800 



41,500 



Bd. ft. 



Cu. ft. 

 1,050 



15 



300 



2,000 



3,600 



5,300 



7,100 



8,900 



10, 900 



12, 800 



14,500 



16,200 



17, 700 



19, 300 



20, 800 



22, 400 



1,560 



20 



2,120 



25 



2,730 



30 



3,350 



35 



3,950 



40 



4,570 



45 



5,200 



50 



5,840 



55 



6,450 



60 



7,020 



65 



7,570 

 8,100 



70 



75 



8,600 



80 



9,110 





QUALITY II. 



10 



15 

 20 

 25 

 30 

 35 

 40 

 45 

 50 

 55 

 60 

 65 

 70 

 75 



3,725 

 2,450 

 1,635 



2.2 

 3.4 

 4.6 



18 

 26 

 33 



82 

 108 

 129 







1,100 

 3,200 





300 



1,095 



5.6 



38 



145 



5,200 



1,700 



765 



6.5 



43 



156 



7,300 



3,200 



600 



7.3 



47 



165 



9,400 



4,700 



500 



8.0 



50 



172 



11,700 



6,300 



420 



8.7 



54 



176 



14,300 



7,900 



355 



9.4 



57 



179 



17, 000 



9,500 



310 



10.0 



59 



182 



19, 700 



11,000 



270 



10.6 



62 



183 



22, 400 



12,500 



230 



11.3 



64 



185 



25, 200 



13, 900 



205 



11.8 



66 



186 



27,800 



15,300 



180 



12.4 



69 



187 



30, 400 



16,700 



155 



13.0 



71 



188 



32,900 



18, 100 



660 

 1,000 

 1,380 

 1,840 

 2,330 

 2,820 

 3,320 

 3,830 

 4,360 

 4,880 

 5,360 

 5,830 

 6,280 

 6,730 

 7,160 



1 Counties in North Carolina are: Alexander, Burke, Cabarrus, Catawba, Cleveland, Davie, Gaston, 

 Lincoln, McDowell, Rowan, Rutherford, Surry, Wilkes, and Yadkin. 



