Woody debris and tree regeneration dynamics following severe wildfires in arizona ponderosa pine forests

John P. Roccaforte, Peter Z Fule, W. Walker Chancellor, Daniel C. Laughlin

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

Severe forest fires worldwide leave behind large quantities of dead woody debris and regenerating trees that can affect future ecosystem trajectories. We studied a chronosequence of severe fires in Arizona, USA, spanning 1 to 18 years after burning to investigate postfire woody debris and regeneration dynamics. Snag densities varied over time, with predominantly recent snags in recent fires and broken or fallen snags in older fires. Coarse woody debris peaked at > 60 Mg/ha in the time period 6-12 years after fire, a value higher than previously reported in postfire fuel assessments in this region. However, debris loadings on fires older than 12 years were within the range of recommended management values (11.2-44.8 Mg/ha). Overstory and regeneration were most commonly dominated by sprouting deciduous species. Ponderosa pine (Pinus ponderosa C. Lawson var. scopulorum Engelm.) overstory and regeneration were completely lacking in 50% and 57% of the sites, respectively, indicating that many sites were likely to experience extended periods as shrublands or grasslands rather than returning rapidly to pine forest. More time is needed to see whether these patterns will remain stable, but there are substantial obstacles to pine forest recovery: competition with sprouting species and (or) grasses, lack of seed sources, and the forecast of warmer, drier climatic conditions for coming decades.

Original languageEnglish (US)
Pages (from-to)593-604
Number of pages12
JournalCanadian Journal of Forest Research
Volume42
Issue number3
DOIs
StatePublished - Mar 2012

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woody debris
Pinus ponderosa
wildfires
wildfire
coniferous forests
regeneration
snag
snags
overstory
sprouting
grass seed
coarse woody debris
chronosequences
forest fires
chronosequence
shrubland
forest fire
shrublands
trajectories
grasslands

ASJC Scopus subject areas

  • Global and Planetary Change
  • Ecology
  • Forestry

Cite this

Woody debris and tree regeneration dynamics following severe wildfires in arizona ponderosa pine forests. / Roccaforte, John P.; Fule, Peter Z; Chancellor, W. Walker; Laughlin, Daniel C.

In: Canadian Journal of Forest Research, Vol. 42, No. 3, 03.2012, p. 593-604.

Research output: Contribution to journalArticle

Roccaforte, John P. ; Fule, Peter Z ; Chancellor, W. Walker ; Laughlin, Daniel C. / Woody debris and tree regeneration dynamics following severe wildfires in arizona ponderosa pine forests. In: Canadian Journal of Forest Research. 2012 ; Vol. 42, No. 3. pp. 593-604.
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