This report includes statistics for New Mexico 

 and Arizona and for the two States combined. 



REMOVAL ESTIMATES 



Expansion factors are computed to permit calcu- 

 lation of the inventory that remains following com- 

 mercial logging operations. To adjust the inventory, 

 removals (volume of products plus residues from fell- 

 ing and skidding) must be subtracted from the pre- 

 logging inventory. However, the removal volume should 

 omit material that was not included in the inventory, 

 i.e., the portions of tree stems overutilized by in- 

 ventory standards. Such material can come from cut- 

 ting below the minimum stump height (1 foot by Forest 

 Survey standards) or from harvesting product volume 

 beyond specified top diameters. It also can come from 

 harvesting saw logs from growing stock trees of less 

 than the sawtimber size specified for inventory or by 

 cutting roundwood products from cull trees. 



Overutilized material (by Forest Survey standards) 

 was excluded from the removal volume when the conver- 

 sion factors shown in table 1 were developed. How- 

 ever, the overutilized volume normally is part of the 

 reported product volume to which these factors will 

 be applied. 



Therefore : 



^ ^ removal volume , • , • 



conversion factor = ^ — :; , which is 



product volume 



equivalent to 



net product volume (excluding overutilization) 



+ residue volume 



product volume (including overutilization) 



In the Arizona-New Mexico area, as well as in each 

 of these States individually, the net voluijie of timber 

 removed from growing stock inventory averages 1.12 

 times the cubic-foot volume of saw logs harvested 

 (table 1). 



2 



