RESULTS 



This section describes equations that were statistically derived from the 

 data. Table 4 shows the range of data for independent variables used to 

 develop the model. Data represent 2-20 years since disturbance, all aspects, 

 0-390 square feet of residual overstory basal area, 2,400-7,400 feet elevation, 

 four site preparation methods, 0-110 percent slopes, and up to 16 years of 

 budworm defoliation. The year of harvest for stands included in this study 

 ranged from 1959 through 1978. 



Table 5 shows the number of plots sampled by classification variables of 

 regeneration method, site preparation, habitat type series, and budworm 

 history. Except for the road site preparation category, this is the same in- 

 formation matrix used in the stratified random selection of stands. Some 



Table 4 — Number of plots by classes for independent variables used to develop version 2 of the Regeneration Estab- 

 lishment Model. Classes used below show the range of data — analyses used the data as continuous vari- 

 ables unless otherwise noted in appendix B 



Class 



No. plots 



Class 



No. plots 



Years since 





Site preparation 





last disturbance 





None 



5,648 



2 



58 



Mechanical 



3,055 



3 



768 



Burn 



2,742 



4 



849 



Road 



683 



5 



974 







6 



986 

 934 

 822 

 914 



762 



neyeneraiion 







iTieinuu 





7 

 8 

 9 

 10 



^ loar/^i if 

 ^leaiCUl 



H,00*f 



oeeouee 





Ol IcUcI WUUU 





oeiecuon 



c.^ 1 DO 



11,12 



1,549 



13,14 



1,233 



Regeneration mode 





15,18 



1,062 



Natural 



7,624 



17,18 



631 



Planted 



4,504 



19,20 



586 



Slope (percent) 





Residual basal 





Flat 



313 



area (ft'/acre) 





1-10 



2.187 







6,104 



11-20 



2.822 



10 



1,089 



21-30 



2.637 



20 



1,034 



31-40 



1,794 



30-40 



1,344 



41-50 



1,220 



50-60 



913 



51-80 



1,095 



70-80 



609 



81-110 



60 



90-100 



441 







110-200 



549 



Nearest National 





210-390 



45 



Forest 



178 



Gallatin 



Elevation 





Helena 



371 



(nearest 100 feet) 





Deerlodge 



321 



24-27 



204 



Bitterroot 



461 



28-31 



852 



Flathead 



199 



32-35 



997 



Lolo 



1,446 



36-39 



1,030 



Kootenai 



356 



40-43 



1,879 



Panhandle 



2,933 



44-47 



1.668 



Colville 



271 



48-51 



1,721 



Cleanwater 



2,527 



52-55 



1,178 



Nez Perce 



1,037 



56-59 



1,079 



Payette 



1,399 



60-63 



741 



Boise 



629 



64-67 



445 







68-74 



334 







Class 



No. plots 



Aspect (degrees) 



Flat 204 



346-45 1 .763 



46-105 2,009 



106-165 2.171 



166-225 1.996 



226-285 2,016 



286-345 1 .969 



Topographic 

 position 



Bottom slope 628 



Lower slope 820 



Midslope 7.720 



Upper slope 2.634 



Ridgetop 326 



No. of budworm 

 years in the 5 years 

 before harvest 



9.354 



1 684 



2 579 



3 267 



4 384 



5 860 



No. of budworm 

 years after harvest 



7.232 



1 338 



2 588 



3 678 



4 635 



5 474 



6 388 



7 261 



8 401 



9 366 



10 318 



11 132 



12 171 

 13.14 100 

 15,16 46 



11 



