-14- 



39. Klemmedson, J.O. 1976. Effect of thinning and 



slash burning on nitrogen and carbon in ecosystems 



of young dense pondersoa pine. Forest Sci. 

 22:45-53. 



The authors suggested that one result of burning 

 forest litter may be a shift to organic matter 

 that is more resistant to decay. Therefore, less 

 N would be available in the short and long run. 

 Larger and fewer slash piles might reduce N loss. 



40. Klemmedson, J.O., A.M. Schultz, H. Jenny, and H.H. 

 Biswell. 1962. Effect of prescribed burning of 

 forest litter on total soil nitrogen. Soil Sci. 

 Soc. Am. Proc. 26:200-202. 



Soil samples were removed from a ponderosa pine 

 stand dried and sieved, and laboratory-analyzed. 

 Contained samples were replaced and rewetted 

 before burning. Organic layers were reduced by 

 1/4 after light burning, 1/2 after severe burning. 

 Light burning and no burning resulted in a slight 

 net gain of nutrients in mineral soil over 18 

 months; intense burning showed a slight decrease. 

 Authors felt increases were due to leaching of 

 nitrogenous compounds from decomposing organic 

 material. Possible effects from drying and 

 sieving, eliminating plant roots and other 

 organisms, were not considered. 



41.. Knight, H. 1966. Loss of nitrogen from the forest 

 floor by burning. Forestry Chron. 42:149-152. 



Forest litter from Western hemlock and 

 Douglas-fir stands was burned in a muffle furnace 

 at various temperatures. Little N volatilized 

 from litter burned at temperatures up to 200 C, 

 but loss increased with temperature. 



42. Knighton, M.D. 1977. Hydrologic response and 

 nutrient concentrations following spring burns in 

 an oak-hickory forest. Soil Sci. Soc. Am. J. 

 41:627-631. 



In an area with fine silty soils, burning reduced 

 L and F by as much as 30%. There was no change in 

 soil o.m. , but there were slight increases in 

 phosphate, nitrate, Ca, Mg , and K in soil leachate 

 collected at 15 cm depth. 



