Title: Twelve-year responses of planted and naturally regenerating conifers to variable-retention harvest in the Pacific Northwest, USA
Author: Urgenson, Lauren S.; Halpern, Charles B.; Anderson, Paul D.
Source: Canadian Journal of Forestry Research. 43: 46-55
Description: We studied patterns of conifer regeneration over 12 years as part of a regional-scale experiment in variable-retention harvest in the Pacific Northwest, the DEMO Study. We compared survival and height growth of planted conifers and density and seral composition of natural regeneration among treatments with differing retention levels (15% versus 40%) and patterns (dispersed versus aggregated) replicated across a range of latitudes and forest zones. We also assessed plot-scale relationships of natural regeneration with overstory density and basal area, competing vegetation, and slash accumulations. Early (1- to 2-year) survival of planted seedlings was greater in dispersed treatments (Pinus monticola Douglas ex D. Don, Abies spp.) or unaffected by retention level or pattern (Pseudotsuga menziesii (Mirb.) Franco). Later (5- to 12-year) survival did not differ (all species), but growth was distinctly reduced in dispersed treatments and (or) at higher levels of retention. Density of natural regeneration was 1.5-2.5 times greater in dispersed treatments than in the cleared areas of aggregated treatments.
Keywords: seedling growth, seedling mortality, dispersed retention, regeneration harvest, Pseudotsuga menziesii
View and Print this Publication (970.46 KB)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication. (Please specify exactly
which publication you are requesting and your mailing address.)
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility
Urgenson, Lauren S.; Halpern, Charles B.; Anderson, Paul D. 2013. Twelve-year responses of planted and naturally regenerating conifers to variable-retention harvest in the Pacific Northwest, USA. Canadian Journal of Forestry Research. 43: 46-55.