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Keyword: Arizona

FireCLIME VA: A New Fire and Climate Vulnerability Assessment Tool for the U.S. Southwest

Documents and Media Posted on: December 08, 2020
The FireCLIME VA tool is a new resource that allows land managers to compare management strategies under various climate scenarios and to gauge the potential effectiveness of those strategies for reducing undesirable impacts of climate on wildfire regimes and resulting impacts of wildfire on natural ecosystems.  Document Type: Other Documents

Habitat and growth of ponderosa pine seedlings 11-16 years after fire

Science Spotlights Posted on: November 02, 2020
Ponderosa pine seedling establishment can be constrained following especially large, high-severity wildfires. Young seedlings face high mortality levels in the first few years and remain vulnerable to the next fire until they are taller. Understanding attributes associated with the growth of naturally regenerating seedlings that survive 10+ years postfire is useful in developing post-fire management strategies.

Persistent effects of fire severity on ponderosa pine regeneration niches and seedling growth

Publications Posted on: September 30, 2020
Several recent studies have documented how fire severity affects the density and spatial patterns of tree regeneration in western North American ponderosa pine forests. However, less is known about the effects of fire severity on fine-scale tree regeneration niche attributes such as understory plant composition and cover, surface fuel abundance, and soil properties, or how these attributes in turn affect regenerating ponderosa pine growth.

Climate relationships with increasing wildfire in the southwestern US from 1984 to 2015

Publications Posted on: September 30, 2020
Over the last several decades in forest and woodland ecosystems of the southwestern United States, wildfire size and severity have increased, thereby increasing the vulnerability of these systems to type conversions, invasive species, and other disturbances. A combination of land use history and climate change is widely thought to be contributing to the changing fire regimes.

Grassland Sustainability

Publications Posted on: June 22, 2020
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: June 22, 2020
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: June 22, 2020
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: June 22, 2020
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: June 22, 2020
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: June 22, 2020
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.