In the Ida Creek plantation adjacent to the low PREF plot, where all the families 

 included in the nursery test were planted, area differences were significant at age 4 

 but became less important and nonsignificant by age 6. Actually, the difference between 

 area means remained nearly constant (2 cm between Clearwater and Trestle Creek), but as 

 a percentage of total height that difference dropped from 7 percent at age 4 to only 

 2 percent by age 8. 



When all the families were grouped as to low, mid, or high origin, as with the 

 nursery data, then height at age 8 decreased from low to high elevation (101, 100, and 

 98 cm, respectively). These differences were not significant and that result is con- 

 trary to the findings in the adjacent low plot where the high-elevation seedlings were 

 slightly taller than the low- and mid-elevation seedlings. 



Elevation-aspect study . --Weight at the end of the third year in the nursery 

 (table 7) did not differ significantly among drainages, elevations, aspects, or pollen 

 types. Rehfeldt (in press) also found that at age 6 differences among drainages, eleva- 

 tions, or aspects were not significant when tested by individual control-pollinated 

 families within plots. Seedlings from south aspect plots in this study were generally 

 taller than those from north aspect plots in the same drainage and at the same elevation. 

 This was also the result for the Gold Center Creek drainage in Rehfeldt 's study, but 

 seedlings from north and south aspect Marble Creek plots were essentially equal in height. 



Table 1 .--Third year height of seedlings in the elevation-aspect study 



Seed parent 



location 









Pollen source 











Elevation 





Marble Creek : 

 north aspect : 











Drainage 



zone-^ 



■ Aspect : 



Low 



Mid 



High : 



Local : 



X 



: X 



: X 













- - Height 



(millimeters) - 







Gold Center 

 Creek 



Low 



North 

 South 



71 



67 



71 

 84 



75 

 80 



64 

 87 



70 

 79 



75 







Mid 



North 

 South 



75 

 76 



73 

 69 



83 

 87 



108 



80 

 85 



83 



78 





High 



North 

 South 



73 

 71 



85 

 73 



65 

 84 



72 

 84 



74 

 78 



76 





Marble 

 Creek 



Low 



North 

 South 



84 



87 



88 

 77 



85 

 87 



86 

 84 



85 







Mid 



North 

 South 



74 

 84 



78 



75 

 74 



79 

 84 



76 

 80 



78 



81 





High 



North 

 South 



64 



84 



87 



75 

 84 



75 

 80 



78 





X 74 78 80 83 





X 





X 



L 



79 



N 



76 



M 



80 



S 



81 



H 



78 







Low = 950 m, mid = 1,175 m, high = 1,400 m. 



12 



