You are here

Keyword: Arizona

Southwestern Grassland Ecology

Publications Posted on: May 12, 2016
This chapter provides a brief overview, and selected in-depth coverage, of the factors and processes that have formed, and continue to shape, our Southwestern grasslands. In general, this chapter looks at how distributions of grasslands are regulated by soils and climate, and modified by disturbance (natural and/or anthropogenic).

Tools for Management for Grassland Ecosystem Sustainability: Thinking "Outside the Box"

Publications Posted on: May 12, 2016
Grassland ecosystem management is dynamic and has adapted to the development of new tools and ideas. Our ancestors were indirectly managing grasslands when they learned to move livestock to take advantage of better water and greener forage. One could argue that even their hunting of grassland wildlife, especially the use of fire to drive animals to waiting hunters, had an influence on local grassland ecology.

Effects of wildfire on densities of secondary cavity-nesting birds in ponderosa pine forests of northern Arizona

Publications Posted on: May 12, 2016
Many catastrophic wildfires burned throughout forests in Arizona during the spring and summer of 1996 owing to severely dry conditions. One result of these fires was a loss of preexisting tree cavities for reproduction. In ponderosa pine (Pinus ponderosa) forests most cavities are found in dead trees; therefore, snags are a very important habitat component for cavity-nesting species.

Effects of wildfire severity on small mammals in northern Arizona ponderosa pine forests

Publications Posted on: May 12, 2016
We examined effects of a varied-severity wildfire on the community structure of small mammals and populations of the 2 most abundant species, the deer mouse (Peromyscus maniculatus) and the gray-collared chipmunk (Tamias cinereicollis), in northern Arizona ponderosa pine (Pinus ponderosa) forests. We examined 2 fire severities and compared them to unburned controls.

Purpose and Need for a Grassland Assessment

Publications Posted on: May 12, 2016
This report is volume 1 of an ecological assessment of grassland ecosystems in the Southwestern United States, and it is one of a series of planned publications addressing major ecosystems of the Southwest. The first assessment, General Technical Report RM-GTR- 295, An Assessment of Forest Ecosystem Health in the Southwest (by Dahms and Geils, technical editors, published July 1997), covered forested ecosystems.

Historic and Current Conditions of Southwestern Grasslands

Publications Posted on: May 12, 2016
Southwestern grasslands today share general differences from their pre-Euro-American settlement conditions. With few exceptions, grasslands--whether in the desert, prairie, or mountains--were, prior to non-Indian settlement, more diverse in plant and animal species composition, more productive, more resilient, and better able to absorb the impact of disturbances.

Dynamics of coarse woody debris in southwestern mixed-conifer and ponderosa pine forests

Projects Posted on: October 09, 2015
Snags (standing dead trees) and logs are important components of forest landscapes. RMRS scientists established a series of fixed plots in 1997 for monitoring snag populations. This research has direct ramifications for 11 national forests throughout the Southwestern Region, as well as for our overall understanding of the ecology of coarse woody debris and effects of climate change on forest structure and composition.

Sierra Ancha Experimental Forest

Experimental Forests and Ranges Posted on: September 09, 2015
The U.S. Forest Service established the Sierra Ancha Experimental Forest in 1932 as a research area for studying watershed management. Located within the Tonto National Forest, the climate, soil, and landforms of the Sierra Ancha are representative of much of the southwestern region of the United States.

Simulating post-wildfire forest trajectories under alternative climate and management scenarios

Publications Posted on: July 08, 2015
Post-fire predictions of forest recovery under future climate change and management actions are necessary for forest managers to make decisions about treatments. We applied the Climate-Forest Vegetation Simulator (Climate-FVS), a new version of a widely used forest management model, to compare alternative climate and management scenarios in a severely burned multispecies forest of Arizona, USA.

Managing burned landscapes: Evaluating future management strategies for resilient forests under a warming climate

Publications Posted on: July 08, 2015
Climate change effects on forested ecosystems worldwide include increases in drought-related mortality, changes to disturbance regimes and shifts in species distributions. Such climate-induced changes will alter the outcomes of current management strategies, complicating the selection of appropriate strategies to promote forest resilience.