Logistical problems should be minimal in road fill tree planting on an operational 

 scale. Certainly, access is optimal. Moreover, many roads are constructed in connec- 

 tion with timber sales that require tree planting anyway. Good planting procedures, 

 similar to those prescribed for timber sales, should be used. Planting stock of proper 

 age should be as large as practicable, especially for new road fills. 



Ponderosa pine appears as a climax or serai species in a variety of habitat types 

 on natural slopes (table 4) . Fill slopes may not be the same habitat type as the 

 original slope because of the severity of the change in overall site conditions. How- 

 ever, the habitat type concept does provide a logical stratification of the site 

 potential for the area. Thus, it is suggested that table 4 be used as a guide for 

 planting ponderosa pine on road fills based upon the forest habitat type found on 

 adjacent undisturbed slopes. Ponderosa pine is not suited for roadbed planting in the 

 various alpine fir [Abies lasiocarpa (Hook.) Nutt.) habitat types; lodgepole pine 

 {Finns eontorta Dougl.) is recommended for these areas. 



Table A. --Role of ponderosa pine TPinus ponderosaj in habitat types in central 

 Idaho. (Work by Robert D. Pfister^ Robert Steele, and others. 

 Unpublished reports on file at Forestry Sciences Laboratory, 



Boise, Idaho.) 



Habitat types and phases 



Major : Minor : Major : Minor 

 climax : climax : serai : serai 



Pinus ponderosa series 



Pinus ponderosa/Agropyron spicatum 

 Pinus ponderosa/PestuQa iddhoensis 

 Pinus ponderosa/Purshia tridentata 

 Pinus ponderosa/Symphoricarpos atbus 

 Pinus ponderosa/Symphoricarpos oreophilus 



Pseudotsuga menziesii series 



Pseudotsuga menziesii /Agropyron spicatum 

 Pseudotsuga menziesii /Festuca idahoensis 

 Pseudotsuga menziesii /Corex geyeri 

 Pseudotsuga menziesii /Calamagrostis rubescens 

 Pseudotsuga menziesii / Spiraea betuli folia 



a. Car ex geyeri phase 



b. Calamagrostis rubescens phase 

 Pseudotsuga menziesii /Symphoricax^os oreophilus 

 a. Prunus virginiana phase 



Pseudotsuga menziesii/Symphoricarpos albus 

 Pseudotsuga menziesii/Physocarpus malvaoeus 

 Pseudotsuga menziesii /Acer glabnm 



Abies grandis series 



Abies grandis/ Clint onia uniflora 

 Abies grandis /Vaccinium globulare 

 Abies grandis /Spiraea betuli folia 



X 

 X 

 X 

 X 

 X 



X* 

 X* 



X* 



X* 



X 



X* 



X* 



X 



X* 



X* 



X 

 X 



*These habitat types extend beyond the natural range of ponderosa pine; therefore, 

 ponderosa pine should not be used unless it occurs on undisturbed slopes in the area. 

 Instead, selected shrub species should be investigated. 



16 



