Measures and yields of products and residues 3273 



total tree (above ground portions), the merchantable stem (for sawtimber or for 

 pulp timber), and of the top. The equations for hardwoods are as follows: 



Mixed hardwood sawtimber biomass 



(1.0242)L„W,j^ = 1.9273L„dbh + 0.3491L„H^,3 + 1.4991L„FQ (27-28) 

 + 1.8125 R = 0.962 



(1.0106)L„W^,3 = 2.0622L„dbh + 0.8165L„H^j3 + 1.3588L„FQ (27-29) 



- 0.5217 R = 0.991 



(1.0000)L„W^^ = 4.0765L„dbh - 0.7276L„H„j ^ + 1.7277L„FQ (27-30) 



- 1.4411 R = 0.835 



Mixed hardwood pulp timber biomass 



(1.0730)L„W,j^ = 1.9580L„dbh + 0.6584L„H^j ^ + 0.2801L„FQ (27-31) 



- 0.0439 R = 0.986 



(1.0000)L„W,^ = 2.9422L„dbh - 0.8213L„H,,^ + 1.3122L„FQ (27-32) 

 + 2.4291 R = 0.907 



Premerchantable mixed hardwood biomass 



W,, ^ = 0.6506 (dbh^H^, ^) 0.8415 (27-33) 



R = 0.980 



where: 



Wtj^ = Weight in pounds of wood and bark to a 4.0-inch or merchantable 

 pulpwood top outside bark (includes the topwood portion of tne tree). 



W,j 3 = Weight in pounds of wood and bark to an 8.0-inch or merchantable 

 sawlog top outside bark for pine sawtimber, and 10.0-inch or mer- 

 chantable top outside bark for hardwood sawtimber (does not include 

 the topwood portion of the tree). 

 Wj^ = Weight in pounds of wood and bark of topwood portion of tree from 

 upper sawlog merchantability to upper pulpwood merchantability 

 (does not include limbs, tip, and foliage of tree) 

 Wj^ = Weight in pounds of unmerchantable top, limbs, and foliage (includes 

 wood and bark on these components) 



Wtj ^ = Weight in pounds of entire above-ground biomass of tree. 



dbh = Diameter breast height outside bark in inches. 

 Hn, = total merchantable length for the respective product code, feet 

 Hmj 4 = merchantable length to a 4.0-inch pulpwood top. 



Hm, 3 = merchantable length to an 8.0-inch or merchantable sawlog top for 

 pine and 10.0-inch or merchantable sawlog top for hardwood. 

 Ht = Total height from 0.5-foot stump to terminal bud 

 Hjj ^ = Total height of stem from 0.5-foot stump to terminal bud, for trees less 



than 3.6 inches in dbh 

 FQ = Form quotient (outside bark form class) or the ratio of diameter outside 



bark at 17 feet to dbh outside bark expressed as a decimal fraction 

 Ln = Natural logarithm 



