10- 



change was found in total N or CEC of the mineral 

 soil but o.m. in the surface 10 cm decreased. 

 Total P, K, and Na increased slightly the first 

 year, but decreased to below preburn levels the 

 second year; soluble Ca and Mg decreased in all 

 soil samples. The data were grouped by aspect. 



24. DeByle, N.V. and P.E. Packer, 1972. Plant 

 nutrient and soil losses in overland flow from 

 burned forest clearcuts. p. 296-307 jji 

 Watersheds in Transition. American Water 

 Resources Association. 



Total nutrient losses due to overland flow after 

 burning in Montana on slopes ranging from 9-35% 

 were twice that of unlogged and unburned controls. 

 Dissolved K and Na losses were especially great; 

 Ca and Mg were lost in both dissolved and in 

 sediment form. Losses of P were negligible. 



25. Dunford, E.G. 1958. Forest soils: enigma of 



northwest watersheds. p. 22-23 jji 1st North 



American Forest Soils Conference. Mich. State 

 Univ. 



In reviewing forest burning effects, 

 contradictory reports indicate that fire as a 

 silvicultural tool should not receive blanket 

 approval. The reported temporary effects of 

 increased soil nutrients could result in net 

 losses due to leaching. 



26. Dyrness, C.T. and C.T. Youngberg. 1957. Effect 

 of logging and slash burning on soil structure. 

 Soil Sci. Soc. Am. Proc. 21:444-447. 



Slash burning had no appreciable effect on 

 percentage of water-stable 



27. Dyrness. C.T. 1976. Effect of wildfire on soil 

 wettability in the high Cascades of Oregon. USDA 

 For. Serv. Res. Pap. PNW-202. 18 p. 



Considerable runoff and erosion was observed due 

 to decreased infiltration rate after severe 

 wildfire. Subsurface (2-9") sandy loam soils 

 became highly non-wettable for 5 years after 

 burning, abrubtly decreasing in the 6th year. 

 Substances causing repellency appeared to be large 



