Gross Cubic Foot Stimp Volume — Un forked and Forked Trees 



Unmerchantable gross cubic foot volume is composed of both stump volume and top 

 volume. Information concerning the amount of top wood left after logging can be very 

 useful for residue and fire assessments. Weighted least squares regression was used 

 to fit the following gross cubic foot stump volume equation: 



where 



V^^ = Predicted gross cubic foot stump volume in an unforked or forked tree 



D = D.b.h. in inches. . 



The appropriate regression coefficients, their RMSQR, and the number of trees used can 

 be found in table 6. Stump height was 1.2 feet on the Lincoln National Forest, and 1.0 

 foot on the other National Forests. Methodological details can be found in appendix V. 

 Equations for predicting d.b.h. from stump diameter have been reported previously by 

 Hann (1976). 



Table 6. — Unforked and forked tree gross aiibia foot stwrrp volume data base and regression results 



Species 



National Forest 



Number 

 of 

 trees 



Regression coefficients 



?0 



Relative 

 mean squared 

 residual 

 (RMSQR) 



White pine Santa Fe , Carson 



White pine Lincoln 

 Engelmann spruce-corkbark fir Santa Fe, Carson 

 Yellow pine 

 Yellow pine 

 Blackjack pine 

 Blackjack pine 

 Douglas-fir 

 Douglas-fir 

 Aspen 

 White fir 

 White fir 



-2.20720716E-02 6 . 02924 330E-03 

 -9.81087640E-03 6 . 923O1900E-03 



18 

 42 

 161 



Santa Fe , Carson, Coconino, Tonto 220 

 Lincoln 11 



Santa Fe, Carson, Coconino, Tonto 963 -8 . 24872240E-03 4 . 878802S8E-03 

 Lincoln 57 

 S^mta Fe, Carson, Tonto 115 

 Lincoln 93 

 Santa Fe, Carson 145 

 Scinta Fe, Carson ' 65 



Lincoln 48 



-1.26475621E-02 6. 47928905E-03 

 -7.19317815E-02 5 . 21911020E-03 

 -8.93559070E-02 6 . 21218970E-03 



-3.04689829E-02 6 . 0585O250E-O3 



7.56124690E-04 5 . 27297220E-03 



-2.21569699E-02 6 . 0939042 5E-03 



5.55975850E-03 5. 30326265E-03 



-6.57525870E-03 5.48812315E-03 



-3.25893626E-02 6. 52844110E-03 



0.0553 

 .0159 

 .0658 

 .0417 

 .0351 

 .0505 

 .0268 

 .0648 

 .0311 

 .0797 

 .0512 

 .0171 



10 



