-7- 



12. Boyle, J.R. 1973. Forest soil chemical changes 

 following fire. Communications in Soil Sci. and 

 Plant Anal. 4:369-374. 



Slash burning on coarse sandy soil resulted in 

 increased pH , P, K, and Ca in the top 20 cm of 

 soil during the first 15 months after fire, and 

 increased soil organic matter, but no change in 

 total N. 



13. Brown, G.W., A.R. Gahler, and R.B. Marston. 1973. 



Nutrient losses after clear-cut logging and slash 



burning in the Oregon Coast range. Water 

 Resources Research 9:1450-1453^ 



Nitrate-N dissolved in stream water increased 

 from 4 to 15 kg/ha after logging and burning, 

 compared to check that was logged but not burned, 

 and returned to normal after 3 years. K increased 

 about 3 times over the unburned check but the 

 increase lasted only 1 month. Total P was 

 unchanged . 



14. Burns, P.Y. 1952. Effect of fire on forest soils 

 in the pine barren region of N.J. Yale Univ. 

 School of Forestry Bull. 57. 



This paper reviews older literature on effects of 

 fire. Generally, conflicting results were common, 

 especially concerning nitrogen. Differing results 

 were partly due to differences in measurement 

 techniques and interpretation, as well as 

 different soils and locations. 



15. Chertov, O.G. 1973. The humus of weakly developed 



forest podzols of the Karelian Isthmus. 



Pochnovedenie (1973) No. 1. 35-42. (c.f. Soils 

 Fert. 36:326.) 



Forest fires in pine and spruce-fir vegetation 

 decreased acidity and N of A and B horizons. 

 Humic acid content and P increased. Increased 

 rate of litter decomposition was observed after 

 fires . 



16. Christensen, N.L. 1973. Fire and the nitrogen 

 cycle in California Chaparral. Science 181:66-68. 



Seasonal changes in ammonium and nitrate 

 concentrations as well as total N were analyzed in 

 burned and unburned soils. Total N and o.m. 

 decreased after burning, but both ammonium and 



