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Keyword: trends

Applications of spatial statistical network models to stream data

Publications Posted on: March 12, 2014
Streams and rivers host a significant portion of Earth's biodiversity and provide important ecosystem services for human populations. Accurate information regarding the status and trends of stream resources is vital for their effective conservation and management. Most statistical techniques applied to data measured on stream networks were developed for terrestrial applications and are not optimized for streams.

Trends in stream nitrogen concentrations for forested reference catchments across the USA

Publications Posted on: March 20, 2013
To examine whether stream nitrogen concentrations in forested reference catchments have changed over time and if patterns were consistent across the USA, we synthesized up to 44 yr of data collected from 22 catchments at seven USDA Forest Service Experimental Forests. Trends in stream nitrogen presented high spatial variability both among catchments at a site and among sites across the USA.

The Northern Forest Futures Project: A forward look at forest conditions in the northern United States

Publications Posted on: December 07, 2012
Forests and forest ecosystems provide a critical array of benefits, from clean air and water to commercial products to open space. The forests and their ability to provide desired benefi ts constantly change in response to natural forces, human decisions, and human needs.

A watershed-scale monitoring protocol for bull trout

Publications Posted on: March 26, 2009
Bull trout is a threatened species native to the Pacific Northwest that has been selected as Management Indicator Species on several national forests. Scientifically defensible procedures for monitoring bull trout populations are necessary that can be applied to the extensive and remote lands managed by the U.S. Forest Service.

Twenty years of change on campsites in the backcountry of Grand Canyon National Park

Publications Posted on: March 14, 2008
This article draws on three separate research and monitoring studies to describe 20-year trends in the number and condition of campsites in the backcountry of Grand Canyon National Park. Results are used to assess the effectiveness of a complex and innovative management program, adopted in 1983, that sought to concentrate use on designated campsites in popular places and disperse camping in more remote places.

Trends in campsite condition: Eagle Cap Wilderness, Bob Marshall Wilderness, and Grand Canyon National Park

Publications Posted on: July 20, 2006
The overall trend in condition on established campsites was one of slight deterioration, with the most deterioration occurring in campsite area, mineral soil exposure, and tree damage. Impacts to ground cover vegetation were relatively stable. Differences in amount of impact between high-use and low-use sites generally increased over time.

Campsites in three western wildernesses: proliferation and changes in condition over 12 to 16 years

Publications Posted on: July 19, 2006
Changes in the number and condition of campsites were monitored for 12 to 16 years in portions of the Lee Metcalf, Selway-Bitterroot, and Eagle Cap Wildernesses. The number of campsites increased by 53 to 123 percent, indicating that campsite impacts have increased greatly. Suggestions for reducing campsite impacts are provided.

Wilderness recreation use trends, 1965 through 1994

Publications Posted on: July 19, 2006
Recreation use of the National Wilderness Preservation System has steadily increased since passage of the Wilderness Act in 1964. People are recreating in designated wilderness more than ever. Although the size of the National Wilderness Preservation System has greatly increased since 1964, many wildernesses are also used more heavily than ever.

Trends in pan evaporation and actual evapotranspiration across the conterminous U.S.: paradoxical or complementary?

Publications Posted on: July 07, 2006
Pan evaporation (ETpan) has decreased at 64% of pans in the conterminous U.S. over the past half-century.

Trends in wilderness recreation use characteristics

Publications Posted on: June 23, 2006
Recent studies at the Leopold Institute have included analysis of use and user trends at the Boundary Waters Canoe Area Wilderness, Desolation Wilderness, Shining Rock Wilderness, the Bob Marshall Wilderness Complex, Great Smoky Mountains National Park and Eagle Cap Wilderness.