APPENDIX A: HABITAT TYPE GROUPINGS 



This appendix documents results of analyses to combine similar habitat types into groups for the 

 purpose of predicting regeneration establishment. An analysis of variance was performed by habitat 

 type series (Pseudotsuga menziesii, Abies grandis, Thuja plicata, Tsuga heterophylla, and Abies lasio- 

 carpa) using Scheffe's S test to group similar habitat types, using a 0.05 significance level. Scheffe's 

 test can be used with an unequal number of observations per habitat type, and it is robust regarding 

 nonnormality and heterogeneity of variance (Kirk 1982). 



The results of these analyses, by themselves, did not determine the final groupings. There is varia- 

 tion within habitat type in years since disturbance, aspect, elevation, geographic location, and so on 

 that is not accounted for in the analyses. The results were useful in developing preliminary group- 

 ings that were reviewed by forest ecologists. Their suggestions were incorporated to arrive at the 

 final groupings. 



In the following tables, TPSP means number of trees per stocked plot and SPSP means number of 

 species per stocked plot. See table 2, footnote 1, for definitions of species abbreviations used in nam- 

 ing habitat t)T)es. The stocking mean is the ratio of plots that were stocked. Habitat types under- 

 lined with the same line were not significantly different at the 0.05 level. Habitat types with fewer 

 than 25 plots sampled were omitted from the analyses, but were later placed in the group thought to 

 be most similar, 



Pseudotsuga menziesii Series 



Stocking mean = 0.73 0.72 0.51 0.42 0.33 0.33 0.30 0.28 0.25 0.25 

 PSME/ VACA LIBO VAGL AGS? SYOR SPBE CARU CAGE PHMA SYAL 



TPSP mean = 3.88 3.68 3.16 3.13 2.82 2.75 ^2.54 2.28 1.92 1.71 

 PSME/ LIBO VACA VAGL CARU CAGE SYAL AGSP PHMA SYOR SPBE 



SPSP mean = 1.63 1.42 ^1.21 1.26 1.24 1.16 1.15 1.15 1.12 1.07 

 PSME/ VACA LIBO AGSP VAGL CARU SYOR SYAL PHMA CAGE SPBE 



Final groupings: 1 = PSME/VAGL, LIBO, VACA 



2 = PSME/CARU, CAGE, AGSP, FEID 



3 = PSME/PHMA, ACGL 

 4 = PSME/SYAL, SPBE, SYOR, ARUV, Misc. 



^Average of only 11 stocked plots. 



Abies grandis Series 



Stocking mean = 0.85 0.77 0.51 0.50 0.42 0.39 0.38 0.38 0.33 



ABGR/ CLUN LIBO ChUN' XETE ASCA PHMA VAGL SPBE ACGL 

 -XETE 



TPSP mean = 5.36 4.94 4.36 3.26 2.91 2.65 2.62 2.34 2.23 



ABGR/ CLUN LIBO CLUN' XETE PHMA VAGL SPBE ASCA ACGL 

 -XETE 



SPSP mean = 1.92 1.77 1.50 1.48 1.48 1.33 1.30 1.28 1.20 



ABGR/ CLUN LIBO XETE VAGL CLUN^ PHMA ACGL SPBE ASCA 

 -XETE 



41 



