The Bear Brook Watershed in Maine (BBWM) is a long-term, whole-watershed study examining the effects of experimentally elevated N and S deposition on a treated watershed, in comparison to the adjacent reference watershed. The study is in a northern New England, USA, forested ecosystem, and focuses on soil and stream hydrological and biogeochemical processes, and chemical responses of vegetation. Relative to the reference watershed, the treated ecosystem has migrated biogeochemically towards N saturation, and soil and stream acidification. Some of the responses to N amendments were not expected nor predicted by available models.

The Bear Brook Watershed Manipulation Project: Watershed Science in a Policy Perspective.- The Bear Brook Watershed, Maine (BBWM), USA.- Dynamic Hydrologic Simulation of the Bear Brook Watershed in Maine (BBWM).- Altered Soil-Soil Water Interactions Inferred from Stream Water Chemistry at an Artificially Acidified Watershed at Bear Brook Watershed, Maine, USA.- Nitrogen and Sulfur Input-Output Budgets in the Experimental and Reference Watersheds, Bear Brook Watershed in Maine (BBWM).- Linkages of P and AL Export at High Discharge at the Bear Brook Watershed in Maine.- Chemistry of Dissolved Organic Carbon at Bear Brook Watershed, Maine; Stream Water Response to (NH4)2SO4 Additions.- Mineral Soil and Solution Responses to Experimental N and S Enrichment at the Bear Brook Watershed in Maine (BBWM).- Controls of N Retention and Exports in a Forested Watershed.- Routine Measurements of Dissolved Inorganic 15N in Precipitation and Streamwater.- Soil Type and Forest Vegetation Influences on Forest Floor Nitrogen Dynamics at the Bear Brook Watershed in Maine (BBWM).- Impacts of Ammonium Sulfate Treatment on the Foliar Chemistry of Forest Trees at the Bear Brook Watershed in Maine.