-6- 



9. Beaton, J.D. 1959. The influence of burning on the 

 soil in the timber range area of Lac le Jeune, 

 British Columbia. I. Physical properties. II. 

 Chemical properties. Can. J. Soil. Sci. 

 39:1-11. 



Total porosity decreased with burning on most 

 sites, especially on twice-burned areas; some 

 areas showed increased total porosity due to 

 increased grass vegetation. Bulk density 

 increased and infiltration rate decreased. 

 Average soil temperature increased by 8 C on 

 burned sites and by 16 C on twice-burned sites. 

 Organic matter and total N decreased in the 

 horizon, no trend was seen in the A2 . Total P 

 varied, but acid-soluble P decreased in the 0, no 

 change in the A2 . 



10. Biswell, H.H. and A.M. Schultz. 1957. Surface 

 runoff and erosion related to prescribed burning. 

 J. Forestry 55:372-374. 



In Ponderosa pine forests, prescribed burning 

 reduced the litter and duff by about 50%. No 

 accelerated erosion and runoff was determined to 

 be due to burning on slopes of 20-43%, since 

 mineral soil was not exposed; nearby logging and 

 skid roads did show pronounced erosion. 

 Prescribed burning could be done every 4 or 5 

 years, maintaining sufficient duff to prevent 

 erosion. 



11. Bollen, W.B. 1974. Soil microbes. p. B1-B41. ^il 

 O.P. Cramer (ed.) Environmental effects of forest 

 residues management in the Pacific northwest: a 

 state-of-knowledge compendium. USDA For. Serv. 

 General Technical Report PNW-24. Portland, 

 Oregon. 



Detailed description of nutrient cycling and 

 microorganisms in Douglas-fir forests and 

 reference to other research is given. Effects 

 from burning were too variable to allow 

 generalization about short-term or long-term 

 effects on soil microorganisms. Nitrogen loss and 

 soil physical property effects from burning may be 

 very unfavorable for microorganisms; stimulation 

 of microorganisms to increase the rate of o.m. 

 turnover may be preferable to burning forest 

 residues. 



