B7 evidence
Upper comparable soil
Lower comparable soil
Before Biscuit (1992)
409
2932
Total
3341
After Biscuit (2003)
12
2775
2787
Total
Changes in:
Initial results
Major loss of nitrogen in some
stands: over 400 kg/ha (another 400 estimated from burned vegetation
suggests about 800 kg/ha total).
Trees take up about 35 kg/ha every
year; thus perhaps over 18 years of supply have been lost.
- 400
- 160
- 560
Total
Change in N
Soil changes as averaged for one stand—nitrogen
content (kg N/ha) changes.
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