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Keyword: Arizona

Grassland Sustainability

Publications Posted on: May 12, 2016
In this chapter we discuss grassland sustainability in the Southwest, grassland management for sustainability, national and local criteria and indicators of sustainable grassland ecosystems, and monitoring for sustainability at various scales. Ecological sustainability is defined as: [T]he maintenance or restoration of the composition, structure, and processes of ecosystems over time and space.

Roost sites of radio-marked Mexican spotted owls in Arizona and New Mexico: sources of variability and descriptive characteristics

Publications Posted on: May 12, 2016
To increase understanding of roosting habitat of Mexican Spotted Owls (Strix occidentalis lucida) and factors that influence use of roosting habitat, we sampled habitat characteristics at 1790 sites used for roosting by 28 radio-marked Mexican Spotted Owls in three study areas in Arizona and New Mexico.

Historic and Contemporary Land Use in Southwestern Grassland Ecosystems

Publications Posted on: May 12, 2016
This chapter encompasses the lands of the Southwest as defined by Region 3 of the USDA Forest Service (USFS): Arizona, New Mexico, and portions of western Oklahoma and the Texas Panhandle. I examine human use and modification of the grasslands/rangelands of this region, with an emphasis on those areas managed by the Forest Service.


Publications Posted on: May 12, 2016
This volume addresses the wildlife and fish of the grasslands in the Southwestern Region of the USDA Forest Service. Our intent is to provide information that will help resource specialists and decisionmakers manage wildlife populations within grassland ecosystems in the Southwestern United States. The information and analysis presented is at a Regional scale.

Grassland Assessment Categories and Extent

Publications Posted on: May 12, 2016
This chapter establishes a general framework for describing the various kinds of grasslands outlined in subsequent chapters. This framework outlines the major categories or classes of grasslands that occur as part of Southwestern terrestrial ecosystems within National Forest System lands and provides an ecological and environmental context in regards to how they differ in their floristic, geographic, spatial, and climatic settings.

Dynamics of a pinyon-juniper stand in northern Arizona: a half-century history

Publications Posted on: May 12, 2016
This paper adds to the limited knowledge of stand dynamics in pinyon-juniper woodlands by reporting on the changes in species composition, numbers of trees, arrangements of trees, and total height and volume in a stand from late 1938 to early 1991. This information should be helpful in managing pinyon-juniper woodlands to sustain their productivity and maintain their multiple-use values.

Comparative habitat use of sympatric Mexican spotted and great horned owls

Publications Posted on: May 12, 2016
To provide information on comparative habitat use, we studied radiotagged Mexican spotted owls (Strix occidentalis lucida: n = 13) and great horned owls (Bubo virginianus: n = 4) in northern Arizona. Home-range size (95% adaptive kernel estimate) did not differ significantly between species during either the breeding or nonbreeding season.

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.