Winter versus Summer 



One area studied is used heavily forcross-country skiing, 

 and an evaluation v/as made of both summer and winter 

 ratings. A mixed-age stand of Douglas-fir and larch was 

 harvested using clearcut, overstory removal, and under- 

 story removal. Near-complete removal of residue was 

 done on portions of the cutting units, and lopping and 

 scattering the residues on another portion. The residue 

 treatments were rated about the same with snow cover, but 

 in summer the near complete removal treatment was rated 

 higher in the understory cut unit (fig. 4). 



Winter ratings were nearly the same for all units, 

 probably because snow covered most of the debris and 

 disturbance. In the understory removal treatment, how- 

 ever, the summer rating was high for residues removed. 

 This was probably because there was so little residue 

 remaining in this unit that the first year's growth of 

 small vegetation covered the debris, whereas in the over- 

 story and clearcut units the disturbance was still quite 

 visible the first summer. 



Detailed data on these units and adjacent uncut 

 stands are summarized in table 4. 



Table 4. --Mean ratings of Douglas-fir/larch tractor logging, Lubrecht Experimental Forest, 

 winter and summer 



Treatment Viewer panel' 



1 2 3 



UNCUT 



5.12 



-Mean rating- 

 5.41 



WINTER, first year 



Understory removed 

 Overstory removed 

 Clearcut 



SUMMER, first year 



Understory cut 

 residue removed 

 residue remain 



Overstory cut 

 residue removed 

 residue remaining 



Clearcut 



residue removed 

 residue remain 



(Critical diff.)- 



4.93 

 4.44 

 4.10 



5 01 

 4 63 



4.07 



(.63) 



(.60) 



6.09 

 4.42 



3.48 

 2.87 



2.39 

 2 22 

 (.84) 



Panel 1 University of Montana psyctiology students, 1978. 



Panel 2 University of IVIontana forestry students. 1978. 



Panel 3 University of IVIontana psycfiology students, 1979 



Differences between means thiat exceed ttiis are significant at ttie 95 level. 



'Ttiis panel did not evaluate this treatment 



I 



8 



