Natural fire rotation in the BWCA was about 100 years

Evidence

A Natural Fire Rotation of about 100 yr prevailed in presettlement times, but many red and white pine stands remained largely intact for 150-350 yr, and some jack pine and aspen-birch forests probably burned at intervals of 50 yr or less. There is paleoecological evidence that fire was an ecosystem factor before European man arrived, and even before early man migrated to North America. Probably few areas ever attained the postulated fir-spruce-cedar-birch climax in postglacial times. — Miron L. Heinselman, Fire in the Virgin Forests of the…, 2

Categorization

• DEFINE: Natural Fire Rotation of ~100 yr is the anchor metric the course’s disturbance-history syllabus needs.
• XREF: Challenges climax-community assumptions familiar from ecology course orthodoxy. — connects to: Natural fire rotation quantifies fire’s role and grounds fire-management targets. — Miron L. Heinselman, Fire in the Virgin Forests of the…, 320; Every major fire year coincided with summer or summer-to-fall drought — Miron L. Heinselman, Fire in the Virgin Forests of the…, 238; Surface fires returned every 36 years on average in surviving pine stands. — Miron L. Heinselman, Fire in the Virgin Forests of the…, 163 (+5 more)
• recurring: this claim recurs 5 times within its source

Related

• The Canoe Area burned and regenerated on about a 100-year rotation. (similarity 0.91)
• Natural fire rotation quantifies fire’s role and grounds fire-management targets. (similarity 0.89)
• The BWCA still has a roughly 60-year window before fire exclusion makes restoration impossible. (similarity 0.87)
• Virtually every BWCA virgin forest stand burned since 1595. (similarity 0.86)
• Five fire years created nearly three-quarters of today’s forest stands. (similarity 0.86)
• Virtually every BWCA forest stand regenerated after fire since 1595 (similarity 0.85)
• Restoring the natural regime means burning roughly 4,200 Canoe Area acres yearly (similarity 0.85)
• No large BWCA burns since 1936 already eliminated early postfire communities. (similarity 0.85)
• Surface fires returned every 36 years on average in surviving pine stands. (similarity 0.84)
• The entire BWCA ecosystem was fire-dependent (similarity 0.82)
• Every major fire year coincided with summer or summer-to-fall drought (similarity 0.81)
• Historic burns of 100,000 acres can no longer be allowed in the Canoe Area (similarity 0.79)
• The landscape mosaic remains fire-created even after sixty years of suppression. (similarity 0.79)
• Fire is an intrinsic ecosystem component, not an unnatural disturbance, in the Canoe Area. (similarity 0.78)

Broader Connections

• The Canoe Area burned and regenerated on about a 100-year rotation. #corroborates (0.98) — Miron L. Heinselman, Fire in the Virgin Forests of the…, 322