THE EED SPRUCE. 



35 



Table 11. — Diameter growth of spruce (virg'n) in West Virginia. 1 



[Spruce slope type.] [curved.] 



Diameter 

 breast 

 high. 



Inches. 



21 



2 



3 



4 



5 .... 



6 



7 



8 



9 



10 



11 



12 



13 



14 



15 



15 



17 



IS 



19 



Absolute maximum. 



Average maximum. 



Average. 



Basis. 



Periodic 

 annual 

 growth. 



Time 



required 



to grow 



1 inch . 



Periodic 

 annual 

 growth. 



Time 

 required 

 to g^ow 



1 inch. 



Periodic 

 annual 

 growth. 



Time 

 required 

 to grow 



1 inch. 



Inches. 



Years. 



Inches. 



Years. 



Inches. 



Years. 



Trees. 



0.202 



5.0 

 4.5 

 4.3 



4.0 

 3.8 



0.126 

 .138 

 .148 

 .157 

 .166 



7.9 



7.2 

 6.8 

 6.4 

 6.0 



0. 051 

 .056 

 .060 

 .064 

 .039 



19 6 

 17.9 

 16.7 

 15.6 

 14.5 





.220 





.235 





.250 





.262 



1 



.274 



3.6 



.174 



5.7 



.074 



13.5 



3 



.2S4 



3.5 



.182 



5.5 



.079 



12.7 



1 



.291 



3.4 



.188 



5.3 



.084 



11.9 



5 



.298 



3.4 



.193 



5.2 



.090 



11.1 



12 



.300 



3 3 



.198 



5.1 



.093 



10.4 



24 



.300 



3.3 



.201 



5.0 



.102 



9.8 



27 



.300 



3.3 



.203 



4.9 



.106 



9.4 



37 



.29S 



3.4 



.204 



4.9 



.109 



9.2 



28 



.294 



3.4 



.202 



5.0 



.110 



9.1 



42 



.290 



3.4 



.200 



5.0 



.111 



9.0 



19 



.232 



3.5 



.196 



5.1 



.110 



9.1 



33 



.275 



3.6 



.192 



5.2 



.108 



9.3 



13 



.235 



3.8 



.186 



5.4 



.106 



9.4 



17 



.254 



3.9 



.178 



5.6 



.103 



9.7 



8 



.243 



4.1 



.172 



5.8 



.100 



10.0 



20 





290 



1 From data collected by John Foley in 1903 in Greenbrier County and including trees in all crown classes. 



2 The time required to grow to a diameter of 1 inch at breastheight was 7 years for "absolute maxi- 

 mum" growth conditions, 11 years for "average maximum," and 26 years for '' 



Diameters in even-aged stands vary directly with the age of the 

 stand, so that the relationship of one of the other is of considerable 

 importance. This relationship is brought out in Table 12, which is 

 based on the average diameter growth of the dominant (including 

 codominant) and intermediate trees. 



Table 12. — Diameter growth of red spruce in even-aged, old pasture stands in Maine, 

 New Hampshire, and Vermont, according to age and site qualities. 



[Average diameter breast high i of all dominant (including codominant) and intermediate trees in stands 



of different ages.] 



Age. 



Site qualities. 



Basis. 









I. II. 



III. 













Sample 



Years. 



Inches. 



Inches. 



Inches. 



plots. 



20 



25 



3.8 



4.9 



3.1 



4.0 



2.4 

 3.2 





1 



30 



35 



5.9 

 6.8 



4.9 



5.7 



3.9 

 4.6 





1 



40 



45 



7.5 

 8.1 



6.3 

 6.9 



5.2 

 5.7 





1 



50 



8.6 



7.4 



6.1 



6 



55 



9.0 



7.7 



6.4 



6 



60 



9.3 



8.0 



6.7 



8 



65 



9.5 



8.2 



7.0 



16 



70 



9.7 



8.5 



7.2 



14 





9.9 



8.7 



7.4 



4 



80 



10.1 



8.9 



7.6 



1 



85 



90 



95 



10.2 

 10.4 

 10.6 



9.0 

 9.2 



9.4 



7.8 

 8.0 

 8.2 







1 



100 



10.8 



9.5 



8.4 







59 



i From sample plot data collected in 1910. 



