Table 17 — Weibull distribution functions for determining delay to germination for subsequent 

 best trees. The form of the equation is DELAY = B[-\n{^-X)Y'^ + 1 . Categories left 

 blank use the corresponding coefficient for the 0-2 year budworm category. "X" is 

 a random number drawn from a uniformly distributed pseudo-random number gen- 

 erator. BWAF is the number of years since the last disturbance with budworm 



Years since disturbance and BWAF 







TIME 



= 2-7 yr 



TIME = 



8-12 yr 



TIME 



= 13+ yr 



Species 





0-2 yr 



3+ yr 



0-2 yr 



3+ yr 



0-2 yr 



3+ yr 



Ponderosa 

 pine 



B = 

 C = 



3.81610 

 3.01975 





5.74622 

 2.09376 





9.36345 

 1 .80925 





Western 

 larch 



B = 

 C = 



5.23792 

 3.11598 





7.38005 

 3.04038 





10.42350 

 2.87196 





Lodgepole 

 pine 



B = 

 C = 



5.33757 

 4.16994 





6.78727 

 3.59937 





9.45827 

 2.39138 





Engelmann 

 spruce 



e = 

 c = 



5.36466 

 2.89777 



5.92251 

 3.31325 



7.44468 

 2.80504 



8.62548 

 5.21269 



9.69507 

 3.27745 



8.76074 

 2.30270 



Douglas- 

 fir 



B = 



c = 



4.34376 

 2.33194 



4.01218 

 2.16561 



6.55916 

 2.63560 



5.86172 

 2.16010 



9.16226 

 2.21663 



10.61297 

 2.44953 



wniie 

 pine 



ts = 



c = 



1.71621 





"7 COTJQ 



2.72466 





1 ^. / 9oU 1 



3.98359' 





Grand 

 fir 



B = 

 C = 



4.17909 

 2.47058 



3.67409 

 2.19139 



5.88262 

 2.25957 



6.12256 

 2.38522 



8.49857 

 2.00065 



8.74195 

 2.03146 



Western 

 hemlock 



B = 

 C = 



4.33094 

 1 .97408 





6.30802 

 2.35053 





8.63060 

 2.00997 





Subalpine 

 fir 



B = 

 C = 



3.45725 

 2.06804 



4.11555 

 1.98007 



6.34975 

 2.79933 



6.19124 

 2.84149 



8.65545 

 2.28687 



8.82962 

 2.46665 



Western 

 redcedar 



B = 

 C = 



4.16284 

 2.03892 





7.52536 

 3.12279 





10.20937 

 2.68340 





52 



