Mean δ15N (‰) values of soil inorganic N in burned and unburned watersheds at two sample dates.

One SE is given in parentheses (n = 4 sites), each n represents the average of generally four plots (subsamples).x Value represents only one plot from one sitey Value represents only six plots from two sites, hence statistical analysis of treatment differences not performeda,b significant treatment difference at P ≤ 0.05.Mean δ15N (‰) values of soil inorganic N in burned and unburned watersheds at two sample dates.