APPENDIX A. SITE INDEX CURVES 

 FOR COMMON NORTHERN IDAHO 

 TREE SPECIES, ARRANGED 

 ALPHABETICALLY BY COMMON 

 NAME BEGINNING WITH 

 DOUGLAS-FIR 



Douglas-fir. Monserud's (1984) site 

 curves; index age is 50 years at breast 

 height. Three sets of site curves are 

 presented: (A) curves for stands in the 

 western hemlock or subalpine fir series; 

 (B) curves for stands in the grand fir or 

 western redcedar (Thuja plicata) series, 

 or stands for which the series is not 

 known; (C) curves for the Douglas-fir 

 series. 



Engelmann spruce. Alexander's (1967) 

 site curves converted to index age 50 

 years at breast height by Clendenen 

 (1977). 



250 



30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 



TREE AGE, YRS 



30 40 50 60 70 80 



90 100 110 120 130 140 150 



TREE AGE, 



160 170 180 190 200 210 220 230 240 250 



YRS 



13 



