LIFE HISTORY OF SHORTLEAF PINE. 



45 



Table 19. — Yield of shortleaf pine in North Carolina, compared with yield of Scotch 



pine in Germany. 1 



Characters compared. 



Scotch pine. 



Quality 

 I. 



Quality 

 II. 



Quality 

 III 



Shortleaf pine. 



Quality 

 I. 



Quality 

 II. 



Quality 

 III. 



Trees per acre: 



Trees 30 years old 



Trees 50 years old 



Trees 80 years old 



Diameter, breast high (inches): 



Trees 30 years old 



Trees 50 years old 



Trees 80 years old 



Basal area, breast high, total per acre (square feet) 



Trees 30 years old 



Trees 50 years old 



Trees 80 years old 



Height, average (feet): 



Trees 30 years old 



Trees 50 years old 



Trees 80 years old 



Yield, total per acre (cubic feet): 2 



Trees 30 years old 



Trees 50 years old 



Trees 80 years old 



Periodic annual increment (cubic feet): 



Trees 30 years old 



Trees 50 years old 



Trees 80 years old 



Mean annual increment (cubic feet): 



Trees 30 years old 



Trees 50 years old 



Trees 80 years old 



1,543 

 590 

 206 



4.0 

 7.3 

 11.5 



130 

 167 



184 



1,690 

 4,500 

 6,570 



92 

 103 

 53 



2,536 

 758 

 317 



2.8 

 5.8 

 9.4 



104 

 135 

 151 



26 

 43 

 63 



830 



2,700 

 4,260 



1,200 

 585 



4.2 

 6.7 



67 

 108 

 132 



21 

 34 



400 

 1,730 

 2,930 



49 

 61 

 24 



14 

 35 

 37 



510 

 235 

 90 



7.9 

 11.2 

 15.3 



188 

 215 

 227 



81 



3,350 

 5,850 

 9,100 



121 

 128 



111 

 117 



111 



765 

 355 

 155 



6.5 

 9.4 

 13.0 



156 

 179 



188 



43 

 57 

 71 



2,350 

 4,350 

 7,150 



93 

 106 

 82 



1,405 

 550 

 270 



125 

 144 

 149 



35 



47 

 60 



1,300 

 2,900 

 5,250 



1 Figures from Weise's yield tables for Scotch pine, Quality I and II averaged to make I; III taken as II; 

 and IV and V averaged to make Quality III. 



2 Yield of Scotch pine taken for all wood down to 3 inches in diameter; of shortleaf pine taken only for 

 trees up to 6 inches diameter breast high, and to 6 inches in tops. 



The superiority of shortleaf over Scotch pine in size of trees and 

 total yield is striking. Scotch-pine stands contain from two to three 

 times as many trees per acre as the shortleaf stands, and the trees 

 have correspondingly smaller average diameters. A comparison of 

 the total yield of the two species is interesting. At the age of 30 

 years shortleaf shows about two or three times the yield of the Scotch 

 pine for the better and poorer sites, respectively. At 50 years On 

 first quality situations, the two species approach the closest in yield, 

 yet the yield of shortleaf is just 30 per cent greater than that of 

 Scotch pine. The shortleaf yield is again about 56 per cent greater 

 at the age of 80 years. Similar yield tables for Scotch pine by Dr. 

 Schwappach show usually from 15 to 20 per cent less yield than 

 Weise's tables. 



YIELD IN MKED STANDS. 



In mixed pine and hardwood stands the yield of shortleaf varies 

 widely. In the lower mountains of northern Georgia recent timber 

 estimates made by the Appalachian surveys show an average yield 

 of 1,000 to 3,000 board feet per acre; but on the warmer slopes in 

 the same region, pure virgin pine stands of mixed ages covering 



