USDA Forest Service

Pacific Southwest Research Station

Pacific Southwest
Research Station

800 Buchanan Street
Albany, CA 94710-0011
(510) 883-8830
United States Department of Agriculture Forest Service. USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.

Third Critical Loads Meeting

This meeting affords us a soul-searching opportunity and a chance to think of linkage and relevancy to the public good. Our biggest questions are "What exactly are the effects of air pollution on our forested ecosystems? And, in this regard, are we meeting the public's needs?"

[photo] Mission Inn On February 16-18, 2005, representatives of the USDA Forest Service, U.S. Environmental Protections Agency, National Park Service, U.S. Geological Survey, U.S. universities and scientists from Europe and Canada, met to discuss feasibility of implementing a Critical Loads (CL) approach for evaluating ecological effects of sulfur & nitrogen deposition and acidity on the U.S. federal lands. This was the third meeting on CL held in Riverside, California at the Historic Mission Inn and hosted by the USDA Forest Service, Pacific Southwest Research Station.

Meeting Objectives:
  • Consider appropriate forms of collaboration between the USDA Forest Service (FS) and US Environmental Protection Agency (EPA) to advance the Critical Loads (CL) concept for evaluation of Sulfur (S), Nitrogen (N) and Ozone (O3) impacts on US forest and rangeland ecosystems;
  • Review the status of on-going FS activities to address CL for S, N and O3 on the network of demonstration sites;
  • Review the progress of current efforts to develop and implement an integrated national strategy for evaluation of the effects of S, N and O3 on forest and rangeland ecosystems.
Meeting Participants Main Meeting Small Group Meeting
Meeting Report:

A brief report of the Workshop that was drafted by the meeting facilitator will be located here. The report summarizes presentations, discussions and main conclusions from the Workshop.

Final Report

Powerpoint Presentations:
All (190 mb) (
Day 1: Wednesday, February 16
Opening (Sedell.ppt)
History of Critical Loads Meetings (Bytnerowicz.ppt)
European Critical Loads Work - ICP (Lorenz.ppt)
Asessment of Critical Loads (20mb) (Nagel.ppt)
Canadian Accomplishments on Critical Load Mapping (Ouimet.ppt)
Site-specific Nutrient Mass Balances and Critical Loads for Forests in Canada (Watmough.ppt)
Protecting Ecosystems from S and N Emissions - EPA's Perspective (Sandiford/Haeuber.ppt)
Scientific Justification for Using the Critical Loads Approach (Cosby.ppt)
Introducing Ozone into Critical Loads Analysis (Musselman.ppt)
Non-pollutant ecosystem stress impacts on defining a critical load (McNulty.ppt)
Otter Creek-FS Demo Site for ICP-Forests Methodologies (20mb) (Pardo_1.ppt)
Kings River Demonstration Site (62mb) (Hunsaker.ppt)
Evaluation of air pollution status for the Kings River Project (Bytnerowicz.ppt)
Critical Loads Protocol for Forest Ecosystems in FS class I areas (Pardo_2.ppt)
Day 2: Thursday, February 17
N Deposition, Invasive Species and the Impacts on Biodiversity in Southern California (Allen.ppt)
Introduction to Small group discussions (Fox.ppt)
Group 1: "Standardized" CL protocol proposal (Group_1.ppt)
Group 2: "Standardized" CL protocol proposal (Group_2.ppt)
Group 3: "Standardized" CL protocol proposal (Group_3.ppt)
The Collaborative Environmental Monitoring and Research Initiative (Murdoch.ppt)
Critical Loads and the USFS's Forest Health Monitoring and Forest Inventory and Analysis Programs (14, 33mb) (Dunn.ppt)/(Stolte.ppt)
VT Site-Specific CL and FIA/FHM Results fron New England (Duarte.ppt)
Day 3: Friday, February 18
Research Needs for Critical Loads and Levels (Riebau.ppt)
The BIG Picture - EOS and GEOSS (Worthy.ppt)
Critical Loads: National Park Service Perspective (10mb) (Porter.ppt)
All photos provided by Jeff Sorkin
Small Group Meeting Mission Inn Scene Main Meeting
Last Modified: Mar 28, 2013 03:38:22 PM