Wells, C. G., R. E. Campbell, L. F. DeBano, and others. 

 1979. Effects of fire on soil. A state-of-knowledge review. 

 USDA For. Serv. Gen. Tech. Rep. WO-7, 34 p. 

 Washington, D. C. 



Welch, T. G., and J. O. Klemmedson. 

 1975. Influence of the biotic factor and parent material 

 on distribution of nitrogen and carbon in ponderosa 

 pine ecosystems. In Forest soils and forest land 

 management, p. 159-178. B. Bernier and C. H. Winget, 

 eds. Laval Univ. Press, Quebec. 



Jurgensen, Martin F., Alan E. Harvey, and Michael J. Larsen. 



1981. Effects of prescribed fire on soil nitrogen levels in a cutover Douglas-fir/ 



western larch forest. USDA For. Serv. Res. Pap. INT-275, 6p. Intermt. For. and 

 Range Exp. Stn., Ogden, Utah 84401. 



Reports 6 percent of total nitrogen lost and changes in other related soil properties 

 after a clearcut and broadcast burn. The most persistent change (4 years) was a 

 reduction in soil acidity. Forest management implications are discussed. 



KEYWORDS: available nitrogen, ammonium, nitrate, nitrifying bacteria, site 

 preparation 



USDA Forest Service 

 ji JT^Y Intermountain Forest and 

 /»'-'T'-^\ Range Experiment Station 

 ^^^^a:^ Ogden, Utah 84401 



6 



■ir U.S. GOVERNMENT PRINTING OFFICE 1981 — 777-028/2 Region No. 8 



