This article examines the influence of climate variability and accelerated forest thinning on runoff in ponderosa pine forests in the Salt and Verde River watersheds in central Arizona. The effects of thinning treatments were examined over 15-, 25-, and 35-year periods. Over the course of treatments, cumulative runoff on thinned forests was about 20% greater than un-thinned forests, regardless of whether forest thinning occurred in a dry or wet period. Runoff gains were temporary and modest when compared to total annual flows in Salt-Verde (≤3%). Nonetheless, additional runoff from thinning could help offset projected declines in snowpack due to warming, augment river flows on a seasonal basis, improve conditions for water dependent natural resources, as well as provide incidental benefits to downstream users.Download file (847KB)
The White Mountains Stewardship Project on the Apache-Sitgreaves National Forest in Arizona was designed to reduce the impacts of wildfires on communities, improve wildlife habitat, and help stimulate employment in the wood products industry. A multi-party monitoring board was convened to design a program for evaluating project effectiveness. This report summarizes results from five years of data on economic, social, administrative, and ecological indicators and provides recommendations for improving program effectiveness moving forward.
Descriptions of the Historical Range of Variation or Variability (HRV) characterize the change over time and space in the condition of the Southwest’s major vegetation types and the ecological processes that shape those types. HRVs enable land managers and the public to understand the drivers of change in our region’s major vegetation types.
All of the reports and data sets developed for the Southwest Forest Assessment Project were subjected to external peer review to ensure conformance with the Forest Service’s Science Consistency Review Standards. This report includes a complete list of the resource professionals who reviewed the various components of this project.Download file (<1 MB)
Ecosystem diversity reports were developed to support the Forest Service’s need for information on the species and ecosystems that occur on National Forests in Region 3. The reports contain data summaries and analyses of a variety of regional datasets. Each report is packaged with an introduction and chapters describing methods and data sources.
Brief overview describing a collaborative effort between The Nature Conservancy and U.S. Forest Service Region 3 in Arizona and New Mexico, a project designed to develop scientific information for forest plan revisions and to help in the restoration of ecosystems.Download file (< 1 MB)
Synthesizes the scientific literature on historical fire return intervals associated with the major vegetation systems across Arizona and New Mexico. Included is a crosswalk table for use with the Southwest Regional Gap Analysis Project’s land cover dataset and three ArcGIS layer (.lyr) files that enable the user to mimic the report graphics.Download file (<1 MB)
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