Skip to page content
USDA Forest Service

Research & Development Treesearch

Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern Research Station
Help - We Participate  Government Made Easy

Global Forest Information Service

US Forest Service
P.O. Box 96090
Washington, D.C.

(202) 205-8333

You are here: Home / Search / Publication Information
Bookmark and Share

Publication Information

View PDF (0 bytes)

Title: Seedfall and seed viability within artificial canopy gaps in a western Washington douglas-fir forest

Author: Devine, Warren D.; Harrington, Timothy B.;

Date: 2015

Source: Tree Planter’s Notes: 23-32.

Publication Series: Scientific Journal (JRNL)

Description: Seedfall of coast Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco var. menziesii) has been studied at the forest edge-clearcut interface and in small canopy gaps, but it has not been evaluated in gap sizes that would be typical of a group-selection method of regeneration. In a mature Douglas-fir forest in the Puget Sound lowlands of western Washington, seedfall was measured by month in artificially created circular gaps 0.1, 0.2, 0.3, and 0.4 ha (0.25, 0.5, 0.75, and 1.0 ac, respectively) in size and in the forest matrix. Seedfall was assessed 1 year before and 2 years after gap creation, and a germination trial was used to detect potential gap and seasonal effects on seed viability. Seedfall density was not significantly affected by the presence of gaps up to 0.4 ha (1.0 ac). Germination percentage and germination rate did not differ between seed collected in gaps and that collected in the forest matrix. Seed weight and germination percentage both were highest for fall collections and declined for collections taken throughout winter and spring. We found no evidence that seed dispersal or viability would be a limiting factor in natural regeneration of Douglas-fir under a group-selection system that created gaps up to 0.4 ha (1.0 ac) in size.

Keywords: Group selection, natural regeneration, seed germination.

Publication Notes:

  • 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.



Devine, Warren D.; Harrington, Timothy B. 2015. Seedfall and seed viability within artificial canopy gaps in a western Washington douglas-fir forest. Tree Planter’s Notes: 23-32.


 [ Get Acrobat ]  Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.