Forest thinning and subsequent bark beetle-caused mortality in Northeastern California

  • Published source details Egan J.M., Jacobi W.R., Negron J.F., Smith S.L. & Cluck D.R. (2010) Forest thinning and subsequent bark beetle-caused mortality in Northeastern California. Forest Ecology and Management, 260, 1832-1842.


This study is summarised as evidence for the following.

Action Category

Thin trees within forests: effects on mature trees

Action Link
Forest Conservation
  1. Thin trees within forests: effects on mature trees

    A replicated, site comparison study in 2001-2007 in mixed conifer forest in California USA (Egan et al. 2010) found that thinning reduced the number of conifers killed by fir engraver beetles Scolytus ventralis. The density of ponderosa pine Pinus ponderosa and white fir Abies concolo trees (>10.2 cm) killed from 2001 to 2007 was lower in commercially thinned (23.8 trees/ha) and salvage-thinned plots (16.4 trees/ha) than in unthinned forest units (44.5 trees/ha). Monitoring was carried out using 20 clusters of four 20 × 100 m transects, in commercially thinned (residual basal area ~37 m2/ha), salvage-thinned (salvage harvesting of bark beetle-killed trees and live-tree thinning to reduce basal area to ~25 m2/ha) and in unthinned forest units. Thinning occurred between 1988 and 1998.


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