Fire history and stand structure of two ponderosa pine-mixed conifer sites

San Francisco Peaks, Arizona, USA

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

We reconstructed historical fire regimes and contemporary and historical stand structures in two stands of ponderosa pine-mixed conifer forests on the San Francisco Peaks in northern Arizona, USA. Thirty-four fire-scarred specimens recorded 256 fires from the EAST and WEST study sites. Fires were recorded between 1739 and 1903 for the EAST site and between 1548 and 1947 for the WEST site. The mean fire return interval (MFI: ≥25% scarred) for the period 1690-1892 was 10 years with a range of 3-21 years for the EAST site. The WEST site MFI (period 1612-1876) was 9 years with a range of 3-21 years. Seasonal patterns of fire occurrence showed that the majority of fires burned during the summer months. Fire interval (years) means, variances and distributions between the EAST and WEST sites were not statistically different from one another for the common analysis period of 1690-1876. Historically, both the EAST and WEST sites were dominated by ponderosa pine, with scattered individuals of Douglas-fir, limber pine and white fir, with tree densities that ranged from 43 to 60 trees per hectare (TPH). Current forest composition has shifted from fire-tolerant ponderosa pine to less fire-tolerant, more shade-tolerant species, with tree densities ranging from 928 to over 1700 TPH. We suggest that the dramatic structural changes recorded at our study sites occurred since fire regime disruption.

Original languageEnglish (US)
Pages (from-to)307-320
Number of pages14
JournalInternational Journal of Wildland Fire
Volume14
Issue number3
DOIs
StatePublished - 2005

Fingerprint

fire history
stand structure
Pinus ponderosa
conifers
coniferous tree
history
fire regime
Pinus flexilis
mixed forests
Abies
Pseudotsuga menziesii
coniferous forests
shade
structural change
seasonal variation
summer

Keywords

  • Age structure
  • American Southwest
  • Aspen
  • Douglas-fir
  • Fire regime
  • Fire scar
  • Land-use history
  • Limber pine
  • White fir

ASJC Scopus subject areas

  • Forestry
  • Plant Science

Cite this

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title = "Fire history and stand structure of two ponderosa pine-mixed conifer sites: San Francisco Peaks, Arizona, USA",
abstract = "We reconstructed historical fire regimes and contemporary and historical stand structures in two stands of ponderosa pine-mixed conifer forests on the San Francisco Peaks in northern Arizona, USA. Thirty-four fire-scarred specimens recorded 256 fires from the EAST and WEST study sites. Fires were recorded between 1739 and 1903 for the EAST site and between 1548 and 1947 for the WEST site. The mean fire return interval (MFI: ≥25{\%} scarred) for the period 1690-1892 was 10 years with a range of 3-21 years for the EAST site. The WEST site MFI (period 1612-1876) was 9 years with a range of 3-21 years. Seasonal patterns of fire occurrence showed that the majority of fires burned during the summer months. Fire interval (years) means, variances and distributions between the EAST and WEST sites were not statistically different from one another for the common analysis period of 1690-1876. Historically, both the EAST and WEST sites were dominated by ponderosa pine, with scattered individuals of Douglas-fir, limber pine and white fir, with tree densities that ranged from 43 to 60 trees per hectare (TPH). Current forest composition has shifted from fire-tolerant ponderosa pine to less fire-tolerant, more shade-tolerant species, with tree densities ranging from 928 to over 1700 TPH. We suggest that the dramatic structural changes recorded at our study sites occurred since fire regime disruption.",
keywords = "Age structure, American Southwest, Aspen, Douglas-fir, Fire regime, Fire scar, Land-use history, Limber pine, White fir",
author = "Heinlein, {Thomas A.} and Moore, {Margaret M} and Fule, {Peter Z} and Covington, {Wallace W}",
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T1 - Fire history and stand structure of two ponderosa pine-mixed conifer sites

T2 - San Francisco Peaks, Arizona, USA

AU - Heinlein, Thomas A.

AU - Moore, Margaret M

AU - Fule, Peter Z

AU - Covington, Wallace W

PY - 2005

Y1 - 2005

N2 - We reconstructed historical fire regimes and contemporary and historical stand structures in two stands of ponderosa pine-mixed conifer forests on the San Francisco Peaks in northern Arizona, USA. Thirty-four fire-scarred specimens recorded 256 fires from the EAST and WEST study sites. Fires were recorded between 1739 and 1903 for the EAST site and between 1548 and 1947 for the WEST site. The mean fire return interval (MFI: ≥25% scarred) for the period 1690-1892 was 10 years with a range of 3-21 years for the EAST site. The WEST site MFI (period 1612-1876) was 9 years with a range of 3-21 years. Seasonal patterns of fire occurrence showed that the majority of fires burned during the summer months. Fire interval (years) means, variances and distributions between the EAST and WEST sites were not statistically different from one another for the common analysis period of 1690-1876. Historically, both the EAST and WEST sites were dominated by ponderosa pine, with scattered individuals of Douglas-fir, limber pine and white fir, with tree densities that ranged from 43 to 60 trees per hectare (TPH). Current forest composition has shifted from fire-tolerant ponderosa pine to less fire-tolerant, more shade-tolerant species, with tree densities ranging from 928 to over 1700 TPH. We suggest that the dramatic structural changes recorded at our study sites occurred since fire regime disruption.

AB - We reconstructed historical fire regimes and contemporary and historical stand structures in two stands of ponderosa pine-mixed conifer forests on the San Francisco Peaks in northern Arizona, USA. Thirty-four fire-scarred specimens recorded 256 fires from the EAST and WEST study sites. Fires were recorded between 1739 and 1903 for the EAST site and between 1548 and 1947 for the WEST site. The mean fire return interval (MFI: ≥25% scarred) for the period 1690-1892 was 10 years with a range of 3-21 years for the EAST site. The WEST site MFI (period 1612-1876) was 9 years with a range of 3-21 years. Seasonal patterns of fire occurrence showed that the majority of fires burned during the summer months. Fire interval (years) means, variances and distributions between the EAST and WEST sites were not statistically different from one another for the common analysis period of 1690-1876. Historically, both the EAST and WEST sites were dominated by ponderosa pine, with scattered individuals of Douglas-fir, limber pine and white fir, with tree densities that ranged from 43 to 60 trees per hectare (TPH). Current forest composition has shifted from fire-tolerant ponderosa pine to less fire-tolerant, more shade-tolerant species, with tree densities ranging from 928 to over 1700 TPH. We suggest that the dramatic structural changes recorded at our study sites occurred since fire regime disruption.

KW - Age structure

KW - American Southwest

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KW - Fire regime

KW - Fire scar

KW - Land-use history

KW - Limber pine

KW - White fir

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