Patterns of forest structure, competition and regeneration in southwestern white pine (Pinus strobiformis) forests

Christopher E. Looney, Kristen M Waring

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Pinus strobiformis (southwestern white pine, abbr. PIST), a species that comprises a small but significant component of the mixed-conifer forests of the U.S. Southwest, faces an increasing threat from white pine blister rust (Cronartium ribicola, abbr. WPBR). This potentially lethal, non-native fungal pathogen is windborne and, therefore, virtually impossible to control. However, silvicultural strategies, such as thinning, reintroduction of natural fire regimes, and encouraging natural selection for rust-resistant genotypes, show promise for maintaining or restoring infected stands. To expand ecological knowledge of the species and guide management, we surveyed PIST in mixed-conifer stands throughout Arizona and portions of New Mexico. We examined PIST forest structure, regeneration, and competitive interactions. We found that PIST occupied lower canopy positions in Pinus ponderosa-dominated plots, thereby supporting its classification as an intermediate shade-tolerant species. Plots where PIST was a dominant component showed evidence of succession towards more tolerant conifers. PIST regeneration occurred relatively rarely and was negatively associated with increasing understory plant cover and open conditions. Although PIST faced heavy tree competition, with Pseudotsuga menziesii the most important competitor, small suppressed trees showed evidence of persistence.

Original languageEnglish (US)
Pages (from-to)159-170
Number of pages12
JournalForest Ecology and Management
Volume286
DOIs
StatePublished - Dec 15 2012

Fingerprint

conifers
coniferous tree
regeneration
Pinus
rust disease
Cronartium ribicola
blister rust
fire regime
Pinus ponderosa
ground cover plants
mixed forests
Pseudotsuga menziesii
thinning (plants)
coniferous forests
natural selection
understory
shade
reintroduction
canopy
taxonomy

Keywords

  • Competition
  • Forest structure
  • Mixed-conifer forest
  • Pinus strobiformis
  • Regeneration
  • Southwest USA

ASJC Scopus subject areas

  • Forestry
  • Management, Monitoring, Policy and Law
  • Nature and Landscape Conservation

Cite this

Patterns of forest structure, competition and regeneration in southwestern white pine (Pinus strobiformis) forests. / Looney, Christopher E.; Waring, Kristen M.

In: Forest Ecology and Management, Vol. 286, 15.12.2012, p. 159-170.

Research output: Contribution to journalArticle

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