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Highlight IDTitleStrategic Program Area(s)YearStation
Photo of Composite critical load exceedance map for seven major vegetation types in California. The figure indicates areas where and by how much atmospheric nitrogen deposition is higher than the critical load (e.g., threshold) for risk of harmful ecological effects.  Forest Service
ID: 96
Air-Pollution Thresholds Protect Ecosystems

Research benefits air-quality specialists, land managers, scientists, and policymakers

Principal Investigator : Mark E. Fenn

Water, Air, and Soil2012PSW
Photo of
ID: 234
Development of Critical Loads and Critical Load Exceedance Maps for Protecting California Ecosystems from Atmospheric Nitrogen Deposition

More than 50,000 km2 of the land area in California receive atmospheric deposition inputs of at least 10 kg N/ha/yr. Many ecosystems are negativ ...

Principal Investigator : Mark E. Fenn

Water, Air, and Soil2010PSW
Photo of A coastal sage scrub community from Box Springs Mountain located to the east of the University of California campus in Riverside, California, in which exotic annual grasses are invading the existing plant community resulting in decreased native plant diversity. When the grass becomes dry later in summer, it creates elevated fire danger, resulting in more frequent fire that impedes regeneration of the native species. The end result is vegetation type change and resulting loss of native plant diversity and associated impacts on other organisms that depend on the native plant species.
ID: 1393
Ecosystem services affected by atmospheric nitrogen seposition

Forest Service scientists describe the ecosystem services affected by chronic N deposition in the southern California coastal sage scrub vegetat ...

Principal Investigator : Mark E. Fenn

Wildlife and Fish
Water, Air, and Soil
Photo of Smoke hangs over a large wildfire burning in the northeast corner of Alberta, Canada, in this natural color image taken by the Moderate Resolution Imaging Spectroradiometer (MODIS) on the Aqua satellite on June 8, 2011. Red outlines actively burning are NASA, MODIS Rapid Response Team. NASA, MODIS Rapid Response Team.
ID: 1079
Effects of a Megafire on Air Quality

Few studies have addressed the effects of forest fires on atmospheric levels of reactive nitrogen pollutants, which function as precursors to oz ...

Principal Investigator : Mark E. Fenn

Water, Air, and Soil2016PSW
Photo of Passive samplers for air pollution in Athabasca Oil Sands Region. Forest Service
ID: 87
Industrial Air Pollution May Have Ecological Consequences

Elevated concentrations of ammonia can negatively impact lichen communities and elevated levels of nitrogen and sulfur deposition can potentiall ...

Principal Investigator : Mark E. Fenn

Water, Air, and Soil
Inventory and Monitoring
Photo of Class I and II Wilderness areas and lakes evaluated for acidification vulnerability. Glen Shaw, USDA Forest Service
ID: 680
Vulnerability of High Elevation Lakes of the Sierra Nevada to Atmospheric Acidic Deposition

In at least some years, hundreds of wilderness lakes are likely receiving acid loading in excess of their buffering capacity. The most vulnerabl ...

Principal Investigator : Mark E. Fenn

Water, Air, and Soil2014PSW