ISSN:
1573-5036
Keywords:
Forest soils
;
Nitrogen cycling
;
Nitrogen loss
;
N2
;
N2O
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Summary We examined denitrification and nitrous oxide (N2O) production in intact soil cores removed from a clearcut southern pine site subjected to different harvest, site preparation, and herbicide treatments. Rates of N2O production in structurally intact soil cores incubated with acetylene showed that clearcutting stimulated denitrification but that rates varied by sample date and post-harvest site treatment. The site was harvested in December 1980. In September 1982 denitrification was greater in sheared, piled and disked (SPD) plots than in chopped or reference (uncut) plots; the following May, rates were higher in seven of the eight treatment plots than in the reference plot, and were highest in three of the four herbicide-treated plots. On both sample dates denitrification rates were correlated with nitrification potentials and nitrate pool sizes in the plots, and nitrate added to cores from all treatments significantly stimulated denitrification. Nitrate supply thus appeared to regulate denitrification at this site. Relative to harvest or site preparation losses of nitrogen, denitrification is not a major vector of N loss at this coniferous site; under post-harvest conditions, however, denitrification may be of the same magnitude as leaching losses.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02149830
