FOREST PLANTATIONS AT BILTMORE, N. C. 15 



Table 2. — Average growth in pure northern white pine stands at Biltmore 





Age 



Average height 



(all crown 



classes) 



Average diame- 

 ter breast high 

 (all crown 

 classes) 



Average vol- 

 ume per acre 1 



Years: 



10 





Feet 



20 

 25 

 30 

 35 

 40 

 45 



Inches 



2 

 3 

 4 

 5 



9 



Cubic feet 



500 



15 





20 



3,000 



25 





30 



4,000 



35 . 









i Computed by using an assumed form factor of 0.5. 



The dominant trees vary from 10 feet taller than the average at 

 the younger ages to 20 feet taller for the 35-year-old trees. They 

 are an inch or two greater than the average in diameter. 



For pure white pine stands in the Old Orchard and Apiary planta- 

 tions the sample plot measurements made by the Forest Service in 

 1916, 1922, and 1928, in the un thinned control plots, provide some- 

 what similar figures, as given in Table 3. 



Table 3. — Growth and stocking in pure northern white pine stands on the Old 

 Orchard and Apiary plantations 1 



Old Orchard plantation 



Apiary plantation 



Age of planta- 

 tion 



Good site (plot 16) 



Poor site (plot lc) 



Age of planta- 

 tion 2 



Good site (plot 46) 



1 

 Volume i Trees per 

 per acre ; acre 



Volume 

 per acre 



Trees per 

 acre 



Volume 

 per acre 



Trees per 

 acre 



Years: 



18.. 



24 



30 



Cubic feet Number 

 3,110 1,984 

 3, 600 1, 424 

 3,730 872 



Cubic feet 

 2,310 

 2,770 

 2,960 



Number 

 3,176 

 2,384 

 1,696 



Years: 

 20... 

 26... 

 32... 





Cubic feet 

 4,680 

 5,060 

 5,980 



Number 

 1.425 

 '962 

 725 













1 Volumes were computed by the use of an assumed form factor of 0.5. 



Approximate. 



Although on plots lb and lc the average annual death rates for the 

 past 12 years of observation were 93 and 123 trees per acre, respec- 

 tively, the stand remains much too dense for the best growth. This 

 overdensity is probably responsible for the slowing down of volume 

 growth noticeable in the last six years. In plot Jfi, which is somewhat 

 less dense, with an average annual mortality of 58 trees for the 12- 

 year period, the volume growth in the last half of the period con- 

 siderably exceeded that during the first half. The heights of the 

 dominant trees in 1928 were about 53 feet in plot lb, 41 feet in plot 

 lc, and 63 feet in plot Jfi. The volume growth of these plots should 

 be compared with that of the thinner companion plots discussed on 

 a later page under "Thinning Operations." 



The growth of these planted stands at Biltmore compares very 

 favorably with that of second-growth white pine in New Hampshire, 

 figures for which are given in Table 4. 



