Table 2. Minimum stand structural requirements for old-growth ponderosa pine
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Parameter |
Minimum Value |
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Live tree density |
20–25 trees per ha (tph) |
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Diameter at breast height (dbh) |
38–50 cm (dry sites); >50 cm (moister sites) |
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Age at breast height |
125–150 years |
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Number of canopy layers |
1 story, 2 stories, or multi-storied |
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Tree decadence |
Not required, but expected if some very old trees are present |
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Snag density |
5 per ha >25 cm diameter (desired) |
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Downed logs |
Not required, but numbers increase in the absence of fire |
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