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Keyword: Pinus ponderosa

Fire history and moisture influences on historical forest age structure in the sky islands of southern Arizona, USA

Publications Posted on: November 18, 2016
Aim: The purpose of this study was to examine the influence of moisture and fire on historical ponderosa pine (Pinus ponderosa Dougl. ex Laws.) age structure patterns. Location: We used a natural experiment created over time by the unique desert island geography of southern Arizona. Methods: We sampled tree establishment dates in two sites on Rincon Peak and another site in the Santa Catalina Mountains.

Mountain pine beetle host selection between lodgepole and ponderosa pines in the southern Rocky Mountains

Publications Posted on: October 04, 2016
Recent evidence of range expansion and host transition by mountain pine beetle (Dendroctonus ponderosae Hopkins; MPB) has suggested that MPB may not primarily breed in their natal host, but will switch hosts to an alternate tree species. As MPB populations expanded in lodgepole pine forests in the southern Rocky Mountains, we investigated the potential for movement into adjacent ponderosa pine forests.

Postfire environmental conditions influence the spatial pattern of regeneration for Pinus ponderosa

Publications Posted on: September 30, 2016
Regeneration of ponderosa pine after fire depends on the patterns of seed availability and the environmental conditions that define safe sites for seedling establishment. A transect approach was applied in 2002 to determine the spatial distribution of regeneration from unburned to burned areas within the landscape impacted by the Jasper Fire of 2000 in the Black Hills of South Dakota (USA).

Fortifying the forest: Thinning and burning increase resistance to a bark beetle outbreak and promote forest resilience

Publications Posted on: September 30, 2016
Fire frequency in low-elevation coniferous forests in western North America has greatly declined since the late 1800s. In many areas, this has increased tree density and the proportion of shade-tolerant species, reduced resource availability, and increased forest susceptibility to forest insect pests and high-severity wildfire.

The making of a scar: How fire scars develop in trees

Science Spotlights Posted on: September 12, 2016
When trees are injured they develop physical and chemical boundaries around the injury wound to resist infection. Trees also grow new wood to close over the injured place. Injuries caused by fires result in fire scars and we use the patterns of scarring among many trees to understand when and how often fires burn.  This research helps to understand the biological process of fire scar formation and use it to improve fire history analysis.

Variables associated with the occurrence of Ips beetles, red turpentine beetle and wood borers in live and dead ponderosa pines with post-fire injury

Publications Posted on: August 16, 2016
Recently, wildfires and prescribed burning have become more frequent in conifer forests of western North America. Most studies examining the impacts of insects on trees with post-fire injury have focused on contributions to tree mortality. Few studies have examined fire-caused injuries to estimate the probability of attack by insects.

Long-term post-wildfire correlates with avian community dynamics in ponderosa pine forests [Chapter J]

Publications Posted on: June 30, 2016
We used a 10-year data set to illustrate the long-term correlates of wildfire on avian species richness in the ponderosa pine (Pinus ponderosa) forests of northern Arizona. This study was conducted in the vicinity of the Horseshoe and Hochderffer Fires, which occurred in 1996, and sampling began 1 year after the fires.

Long-term thinning alters ponderosa pine reproduction in northern Arizona

Publications Posted on: May 23, 2016
The future of ponderosa pine (Pinus ponderosa var. scopulorum) forests in the southwestern United States is uncertain because climate-change-induced stresses are expected to increase tree mortality and place greater constraints on regeneration.

Contemporary human use of southwestern ponderosa pine forests

Publications Posted on: May 12, 2016
The ponderosa pine forests of the Southwest provide land, resources, products, and recreational opportunities for both urban and rural communities of the region and the nation. These human uses and activities affect resident and migratory bird populations in both negative and positive ways.

Postfire mortality of ponderosa pine and Douglas-fir: a review of methods to predict tree death

Publications Posted on: May 12, 2016
This review focused on the primary literature that described, modeled, or predicted the probability of postfire mortality in ponderosa pine (Pinus ponderosa) and Douglas-fir (Pseudotsuga menziesii).