Table 3. -- Minimum and maximum specific gravity of sample trees by area and 



basis of determination 





Core 



b.h. 



Section b.h. 



Tree 



Area : 



specific 



gravity 



specific 



orav i t v 



Specific 



er av i t v 





Minimum : 



Maximum 



Minimum : 



Maximum 



Minimum : 



Maximum 



Bishop Burn 



0.379 



0.417 



0.357 



0.486 



0.329 



0.414 



Moose Creek Plateau 



.377 



.482 



.378 



.465 



.366 



.487 



Bostetter Station 



.342 



.370 



.342 



.393 



.350 



.393 



Sheep Creek Park 



.353 



.437 



.358 



.429 



.391 



.456 



Horse Creek 



.315 



.380 



.331 



.447 



.317 



.406 



All 



.315 



.482 



.331 



.486 



.317 



.487 





0.44' 



44 

































ic Gravil 



040 



44^ 













3 



o 



Specit 



36 

 < 







o 



44 



33 



18 







o 

 6 











k 



A 



* 



4 



k 



A 









8 



16 



24 



32 



40 



48 











Height 



From Stump 



(Feet) 







Figure 1. --Specific gravity at successive heights above stump 

 (stem section method) . 



The relation of tree specific gravity to core specific gravity at breast height 

 was further analyzed for 21 trees of commercial pulpwood size (5.6 inches d.b.h. or 

 larger). Diameters inside bark and outside bark were plotted over height, and the vol- 

 umes inside bark of the individual sections were obtained using a planimeter .1.1 The 

 specific gravity of each section was weighted by its volume to arrive at an average tree 

 specific gravity. The linear relation (fig. 2) is: 



7/ U.S. Forest Service Form 558a was used in this procedure. 



3 



