10 -YR PRERELEASE RADIAL GROWTH, IN 



Figure 4 — Relationship of 12-year postrelease diameter growth of 

 Douglas-fir, subalpine fir, and Engelmann spruce to 10-year prerelease 

 radial growth. 



Table 4 — Regression equations predicting natural log of 12-year post release d.b.h. growth of Douglas-fir, 

 Engelmann spruce, and subalpine fir 



Variable 



Coefficient 



Probability 



Douglas-fir 



1973 d.b.h. 0.216 



10-year radial growth 2.284 



Overstory removal 1 .273 



Overstory removal 2 .657 



Overstory removal 3 .850 



Intercept -1.685 

 R-square 



Error mean square 

 F for regression (Probability) 



1973 d.b.h. 



10-year radial growth 2.453 

 Overstory removal 1 .359 

 Overstory removal 2 1 .239 



Overstory removal 3 1 .277 



Intercept -1.242 

 R-square 



Error mean square 



F for regression (Probability) 



Crown ratio -0.408 

 Basal area change .175 

 10-year radial growth 6.067 

 Intercept -1.629 

 R-square 



Error mean square 



F for regression (Probability) 



0.53 

 .41 

 32.38(0) 

 Engelmann Spruce 



0.45 

 .39 

 13.73(0) 

 Subalpine Fir 



0.50 

 .55 

 71.17(0) 



6.51 

 3.37 

 2.01 

 4.54 

 4.22 

 -15.44 



5.02 

 2.18 

 3.68 

 5.43 

 -8.29 



-2.37 

 5.67 

 13.89 

 -11.42 



.025 



.033 



0.019 

 

 

 



