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Keyword: aspen

Species richness has not increased after long-term protection from grazing on sagebrush, aspen and tall forb rangelands

Publications Posted on: May 02, 2013
Recent conservation biology and environmental literature contains claims that livestock grazing has caused and continues to cause reduction in species diversity on Western rangelands, especially public rangelands.

Above- and below-ground effects of aspen clonal regeneration and succession to conifers

Publications Posted on: May 02, 2013
Above- and below-ground characteristics were measured and compared for six sets of paired trembling aspen (Populus tremuloides Michx.) clones on the Fishlake National Forest in central Utah. Three self-regenerating clones were compared with three non-regenerating clones and three pure aspen stands were compared with three mixed aspen-conifer stands.

Summary of nutrient and biomass data from two aspen sites in western United States

Publications Posted on: April 30, 2013
Summary tables are presented for aboveground biomass and nutrient concentrations for 20 aspen trees (Populus tremuloides Michx.) that were sampled at two study sites in Utah and Wyoming. Trees were divided into seven components - leaves, current twigs, old twigs, deadwood (branches), branches, bark, and bole wood.

Soil properties associated with various stages of succession in the aspen ecosystem

Publications Posted on: March 28, 2013
In the Interior west, if current conditions continue (e.g., lack of fire, wildlife use, grazing by livestock, natural succession) that have prevailed for the past 100 to 140 years, most aspen stands will eventually be replaced by conifers, sagebrush, or possibly tall shrub communities. Current estimates are there has beeh a 60% decrease in aspen dominated lands since the arrival of European man.

Nitrogen mineralization in the aspen ecosystem

Publications Posted on: March 28, 2013
Aspen (Populus tremuloides) are in decline throughout the interior western U.S. because of conifer invasion, fire suppression, and overbrowsing by domestic livestock and native ungulates. Aspen restoration requires disturbances such as fire or cutting and exclosures to protect against overbrowsing.

Response of transplanted aspen to irrigation and weeding on a Colorado reclaimed surface coal mine

Publications Posted on: December 21, 2012
Successful re-establishment of aspen (Populus tremuloides Michx.) on surface-mined lands in the western United States is problematic because the species generally regenerates vegetatively by sprouting from parent roots in the soil; however, topsoil is removed in the mining process.

Mortality of aspen on the Gros Ventre elk winter range

Publications Posted on: February 29, 2012
Stands of aspen on the Gros Ventre elk winter range of northwestern Wyoming are suffering high mortality and are not regenerating satisfactorily. If the 1970 mortality rate (3.6 percent) continues, about a two-thirds reduction in the numbers of tree-sized aspen can be expected by year 2000.

Aspen sprout production and water use

Publications Posted on: November 18, 2011
Sprouting response and soil moisture depletion on aspen plots were compared under four experimental conditions: (a) clearcut, (b) clearcut, stumps sprayed with sodium arsenite, (c) basal injection of sodium arsenite, and (d) control. Nunbers of sprouts varied with treatment for 2 years, but after 4 years the nunbers of sprouts on all plots were about equal.

Nest-site selection and nest survival of Lewis's woodpecker in aspen riparian woodlands

Publications Posted on: April 25, 2011
Riparian woodlands of aspen (Populus tremuloides) provide valuable breeding habitat for several cavity-nesting birds. Although anecdotal information for this habitat is available for Lewis's Woodpecker (Melanerpes lewis), no study has previously examined the importance of aspen woodlands to this species' breeding biology.

Characteristics of aspen infected with heartrot: Implications for cavity-nesting birds

Publications Posted on: November 29, 2010
Phellinus tremulae is an important fungal decay agent common to aspen and a critical component to the cavity-nesting bird complex found in western aspen stands. Little information exists on the conditions that facilitate infection and spread of P. tremulae in aspen forests. I used Forest Inventory and Analysis (FIA) data to explore the relationships of several tree and stand characteristics to the presence and frequency of P.