Skip to page content
USDA Forest Service
  
Treesearch

Research & Development Treesearch

 
Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Northern
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern
Help
 

GeoTreesearch


Science.gov - We Participate


USA.gov  Government Made Easy


Global Forest Information Service

US Forest Service
P.O. Box 96090
Washington, D.C.
20090-6090

(202) 205-8333

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

Publication Information

(757 KB)

Title: Climate warming, reduced snow, and freezing injury could explain the demise of yellow-cedar in southeast Alaska, USA

Author: Hennon, P.; D'Amore, D.; Wittwer, D.; Johnson, A.; Schaberg, P.; Hawley, G.; Beier, C.; Sink, S.; Juday, G.

Date: 2006

Source: World Resource Review. 18(2): 427-450.

Publication Series: Journal/Magazine Article (JRNL)

Description: Yellow-cedar (Chamaecyparis nootkatensis) is a valuable tree species that has been experiencing concentrated mortality known as yellow-cedar decline on 200,000 ha of largely pristine forests in Southeast Alaska. Mature trees that regenerated and grew during the Little Ice Age have been dying on low elevation sites with wet soils and open canopies for about 100 years. We propose the following hypothesis to explain tree death (methods in parentheses): landscape features (digital elevation model via LiDAR) and soil properties (soil descriptions) produce poor drainage (wells and piezometers) which create open canopy forests (LiDAR and hemispherical photography) and shallow rooting; exposure allows soils to warm in early spring (air and soil temperature loggers) which triggers dehardening, the loss of cold tolerance, and eventual spring freezing injury (electrolyte leakage testing of tissues). The distribution of yellow-cedar decline is associated with areas of low snowpack in winter and spring. Snow delays soil warming and presumably protects yellow-cedar roots through periods of spring frosts. Limited to higher elevations throughout most of its natural range, perhaps yellow-cedar migrated to lower elevations during the Little Ice Age, and these trees are now vulnerable to the lack of protective snow in these exposed, open canopy forests where forest decline is now severe.

Keywords: freezing, forest decline, Chamaecyparis, global warming, snow, exposure

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.
  • This publication may be available in hard copy. Check the Northern Research Station web site to request a printed copy of this publication.
  • Our on-line publications are scanned and captured using Adobe Acrobat. During the capture process some typographical errors may occur. Please contact Sharon Hobrla, shobrla@fs.fed.us if you notice any errors which make this publication unusable.

XML: View XML

Citation:


Hennon, P.; D'Amore, D.; Wittwer, D.; Johnson, A.; Schaberg, P.; Hawley, G.; Beier, C.; Sink, S.; Juday, G. 2006. Climate warming, reduced snow, and freezing injury could explain the demise of yellow-cedar in southeast Alaska, USA. World Resource Review. 18(2): 427-450.

 


 [ 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.