One final point is of interest. Earlier, it was pointed out that ponderosa pine 

 is an important commercial species. Needless to say, the growing of sawtimber on 

 road fills is not being advocated; however, road fill planting does permit some 

 provocative possibilities for Christmas trees. Certainly, access is good for both 

 the forest manager and the consumer. A number of forest managers have indicated an 

 interest in this aspect of tree planting on road fills. The possibilities are 

 worthy of further consideration, as long as the primary objective, tree planting 

 for erosion control, is maintained. 



This study showed that planting of deep-rooted vegetation (ponderosa pine) reduces 

 surface erosion. Such plantings offer additional benefit over more conventional grass 

 seeding because they lessen mass erosion hazards. However, deep-rooted vegetation 

 should not be construed as a panacea for mass erosion on road fills because it will not 

 prevent all landslides, nor substitute for careful road location, design, and construc- 

 tion practices. Tree planting does provide an additional safeguard that should be 

 seriously considered. 



REFERENCES 



Anderson, H. W. 



1954. Suspended sediment discharge as related to streamflow, topography, soil 

 and use. Am. Geophys. Union Trans. 35:268-281. 

 Andre, J. E., and H. W, Anderson 



1961. Variation of soil erodibility with geology, geographic zone, elevation and 

 vegetation type in northern California wildlands. J. Geophys. Res. 66: 

 3351-3358. 

 Bethlahmy, Nedavia 



1967. Effect of exposure and logging on runoff and erosion. USDA For. Serv. Res. 

 Note INT-61, 7 p. 

 Bethlahmy, Nedavia and W. Joe Kidd, Jr. 



1966. Controlling soil movement from steep road fills. USDA For. Serv. Res. Note 

 INT-45, 4 p. 

 Bishop, Daniel M. , and Mervin E. Stevens 



1964. Landslides on logged areas in southeast Alaska. USDA For. Serv. Res. Pap. 

 NOR-1, 18 p. 

 Boldt, Charles E., and Teja Singh 



1964. Root development of ponderosa pine transplants at Lincoln, Nebraska. USDA 

 For. Serv. Res. Note RM-20, 4 p. 



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