B2 evidence
A horizon
A horizon
N (%)
0.00
0.20
0.40
0.60
0.80
1.00
B2
B1
B2 horizon
B1
B1
A horizon
O horizon
A horizon
A horizon
O horizon
O horizon
B2 horizon
A horizon
Control,
no-action
Late-succession, lo-wood
Douglas-fir,
hi-wood
Increasing fire temperature and tree mortality
O horizon
O horizon
O horizon
Post-fire (2003) soil % N
Pre-fire (1992) soil % N
Changes in concentration of nitrogen in soils across LTEP stands
Nitrogen (N) concentrations as measured in organic (O), top mineral (A), and lower mineral (B1 and B2) soil horizons. Green lines are before and red after the Biscuit Fire. Vertical brackets are 95% confidence intervals.
Initial result:
Nitrogen concen- trations of upper soil horizons diminished greatly on some burned LTEP stands. 
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