Analysis
y = 1.097x - 0.223
R
2
= 0.97
0
10
20
0
4
8
12
16
20
Percent C; 1993 estimates
Percent C; 2005 estimates
1:1
Carbon
Instrument error—comparing analyses of pre-fire soil with 1993
and 2005 carbon-hydrogen-nitrogen (CHN) instruments.
Nitrogen concentrations in archived
samples are estimated to be about 15% higher, when using modern instruments compared to instruments values from 1993.
Instruments give nearly identical C
estimates, suggesting that biological activity during storage is not a factor in different N
estimates.
y = 0.868x - 0.0169
R
2
= 0.95
0.0
0.2
0.4
0.0
0.2
0.4
0.6
Percent N; 1993 estimates
Percent N; 2005 estimates
1:1
Nitrogen
0.6
Initial results:
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