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

(571 KB)

Title: Factors influencing the spatial and temporal dynamics of engelmann spruce mortality during a spruce beetle outbreak on the Markagunt Plateau, Utah

Author: DeRose, R. Justin; Long, James N.

Date: 2012

Source: Forest Science. 58(1): 1-14.

Publication Series: Journal/Magazine Article (JRNL)

Description: Host conditions are known to influence spruce beetle population levels, but whether they influence the spatial and temporal patterns of beetle-caused mortality during an outbreak is unknown. Using dendrochronological techniques, we quantified the spatiotemporal dynamics of a modern (late 1980s through the early 2000s) spruce beetle outbreak in Engelmann spruce on the Markagunt Plateau, Utah. Erupting beetle populations occurred in multiple areas across the Plateau over the course of 8 years. Early in the outbreak, the timing of spruce mortality was strongly and predictably related to latitude, slope, aspect, stand structure, host species composition, and site productivity potential. Exogenous forcing from landscape-scale drivers such as winter minimum temperatures, summer maximum temperatures, and landscape-wide host suitability probably contributed to spruce beetle population success and heightened spruce mortality. As the outbreak progressed, the timing of spruce mortality became less well correlated to stand and environmental variables. The outbreak subsided when suitable host material was depleted, including smaller spruce in remote stands at the fringe of the spruce-fir zone. Tests for spatial and temporal autocorrelation of beetle-cased spruce mortality did not provide strong evidence for the common perception that spruce beetle outbreaks originate in a specific location (epicenter) and then "spread" across the landscape; rather, support for positive spatial synchrony of multiple, building populations during development of the outbreak was found. Based on these results, silvicultural intervention before the onset of an outbreak might mitigate Engelmann spruce losses; however, the same is almost certainly not true later in an outbreak of this scale and magnitude.

Keywords: Dendroctonus rufipennis, Picea engelmannii, silviculture, spatial covariance function, spruce-fir, time-series analysis

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.

XML: View XML

Citation:


DeRose, R. Justin; Long, James N. 2012. Factors influencing the spatial and temporal dynamics of engelmann spruce mortality during a spruce beetle outbreak on the Markagunt Plateau, Utah. Forest Science. 58(1): 1-14.

 


 [ 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.