-12- 



needle drop and woody material from dead trees. 

 Less litter fell on burns in the third year after 

 fire . 



32. Grigal, D.F., and J.G. McColl. 1977. Litter 

 decomposition following forest fire in 

 northeastern Minnesota. J. Appl . Ecol. 

 14:531-538. 



Decomposition of aspen and aster leaf litter 

 placed in litter bags was the same in burned or 

 unburned areas. 



33. Gupta, P.L. and I.H. Rorison. 1975. Seasonal 

 differences in the availability of nutrients down 

 a podzolic profile. J. Ecol. 63:521-533. 



Seasonal flushes in available P and N occurred in 

 May-June and Jan. -Feb. in Great Britain, but 

 times of peak availability may vary from year to 

 year and site to site. Seasonal depression in 

 available P and N was thought due to plant uptake 

 during summer months. Depression of pH occurred 

 in June-July. Normal seasonal variation needs to 

 be considered in fire effects on soil when 

 measuring available plant nutrients. 



34. Harvey, A.E., M.F. Jurgensen, and M.F. Larsen. 

 1976. Intensive fiber utilization and prescribed 

 fire: effects on the microbial ecology of 

 forests. USDA For. Serv. General Technical 

 Report INT-28. Intermountain For. and Range Exp. 

 Sta., Ogden, Utah. 46 p. 



Literature on the effects of prescribed fire on 

 soil properties which affect microorganisms is 

 summarized. In addition to direct effects, 

 saprophytic and pathogenic activities are affected 

 by humidity, aeration, temperature, moisture, pH , 

 C/N ratio, and soil nutrient changes caused by 

 fire. Extensive bibliographies and suggestions of 

 areas where research is needed are included. 



35. Humphreys, F.R. and M.J. Lambert. 1965. An 

 examination of a forest site which has exhibited 

 the ash-bed effect. Aust. J. Soil Res. 

 3:81-94. 



Nine years after planting radiata pine in 

 Australia on sites where Eucalyptus slash had been 

 burned, trees were higher and had twice the volume 

 of those planted on unburned sites. Foliage 



