Long-term decrease of organic and inorganic nitrogen concentrations due to pine forest wildfire

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Table II

Effects of last-fire year and sampling date on microbial biomass N (MB-N), mineral N, dissolved organic N (DON), DON-to-mineral N, and LON-to-Mineral N ratios (Kruskal-Wallis test).

	Fire
							Sampling date
	Spring			Winter

	df	Chi²	P	df	Chi²	P	df	Chi²	P
MB-N	5	100.99	< 0.001	5	89.56	< 0.001	1	4.27	< 0.05
Mineral N	5	31.46	< 0.001	5	59.43	< 0.001	1	93.02	< 0.001
DON	5	35.14	< 0.001	5	73.32	< 0.001	1	157.55	< 0.001
DON/Min-N	5	20.02	< 0.005	5	73.13	< 0.001	1	186.99	< 0.001
LON/Min-N	5	96.43	< 0.001	5	37.53	< 0.001	1	8,72	< 0.005