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Keyword: Picea engelmannii

A test of lethal trap trees for control of spruce beetles

Publications Posted on: July 22, 2019
The spruce beetle, Dendroctonus rufipennis, can cause extensive mortality of Engelmann spruce, Picea engelmannii, during outbreaks. Endemic populations breed in the underside of downed spruces. Outbreaks often develop after blowdowns that create abundant downed trees where beetle populations can increase. Occasionally, managers practice suppression to protect high-value resources.

Silvicultural systems and cutting methods for old-growth spruce-fir forests in the central and southern Rocky Mountains

Publications Posted on: July 06, 2018
Guidelines are provided to help the forest manager and silviculturist develop even- and/or uneven-aged cutting practices needed to convert old-growth spruce-fir forests into managed stands for a variety of resource needs. Guidelines consider stand conditions, succession, windfall risk, and insect and disease susceptibility.

Estimating potential Engelmann spruce seed production on the Fraser Experimental Forest, Colorado

Publications Posted on: December 09, 2016
Two good, three heavy, and two bumper spruce seed crops were produced during a 15-year period. There was considerable variability in seed crops, however. Not all locations produced good to bumper seed crops when overall yearly ratings averaged good or better; conversely, some locations produced bumper seed crops in 3 or more years.

Silvical characteristics of Engelmann spruce

Publications Posted on: July 05, 2016
This report summarizes information on distribution, botanical description, habitat conditions, life history, special uses, and genetics of Engelmann spruce.

Seed and ring width data from 'Climate drivers of seed production in Picea engelmannii and response to warming temperatures in the southern Rocky Mountains'

Datasets Posted on: June 08, 2016
Seed production by Picea engelmannii was monitored at 13 plots distributed across an approximately 670 meter elevation gradient in the Fraser Experimental Forest near Fraser, Colorado. Seeds were collected annually between 1970 and 2010 from ten wire mesh seed traps located in each of the 13 plots. Annual plot level estimates of seed abundance were derived from an average value of the 10 traps.

Oldest known Engelmann spruce

Publications Posted on: May 12, 2016
Age structure in a stand of very old-age Engelmann spruce is described. The site is at 3,505 m near treeline in the Fraser Experimental Forest in central Colorado. The site contains the oldest Engelmann spruce trees yet reported in the literature; the oldest tree is at least 852 years of age.

Effect of two years of nitrogen deposition on shoot growth and phenology of Engelmann spruce seedlings

Publications Posted on: May 29, 2015
As a result of anthropogenic combustion processes, ecosystems in the eastern and western United States and Europe have experienced elevated atmospheric deposition of nitrogen for most of this century and have begun to show symptoms of decline. If there is a cause and effect relationship between nitrogen deposition and ecosystem decline, one would expect that the current symptoms are a result of the cumulative effect of years of deposition.

Tenderfoot Creek Research Project seedling, sapling and variable radius plot tree data

Datasets Posted on: March 27, 2015
This data publication contains seedling density, sapling density and variable plot radius tree data associated with the Tenderfoot Creek Research Project sampled between 1997 and 2007. Experimental shelterwood harvests combined with prescribed burning were implemented in the Tenderfoot Creek Experimental Forest between 1999 and 2003. These data contain pre- and post-treatment data.

Tenderfoot Research Project: Fuel loading and postburn tree mortality data

Datasets Posted on: March 27, 2015
This product contains fuel loading, overstory tree mortality and burn severity data associated with the Tenderfoot Creek Experimental Forest Vegetative Treatment Research Project between 2000 and 2009. The project is located on the Tenderfoot Creek Experimental Forest (TCEF) which is north of White Sulphur Springs, Montana.

Patterns of growth dominance in forests of the Rocky Mountains, USA

Publications Posted on: September 26, 2014
We used data from 142 stands in Colorado and Wyoming, USA, to test the expectations of a model of growth dominance and stand development. Growth dominance relates the distribution of growth rates of individual trees within a stand to tree sizes. Stands with large trees that account for a greater share of stand growth than of stand mass exhibit strong growth dominance.