White Mountain National Forest, New Hampshire
The Hubbard Brook Experimental Forest was established in 1955 as a major center for hydrologic research in New England. Located in the White Mountain National Forest in central New Hampshire, the 3,138-ha bowlshaped Hubbard Brook Valley has hilly terrain, ranging in elevation from 222 to 1,015 m. The Hubbard Brook Ecosystem Study was established by a cooperative agreement in 1963. In 1988 the Hubbard Brook was designated as a Long-Term Ecological Research site by the National Science Foundation.
Climate
Annual precipitation at Hubbard Brook averages about 1,400 mm, with one-third to one-quarter as snow. The month of January averages about -9 °C and the average July temperature is 18 °C. The average number of days without killing frost is 145. The estimated annual evapotranspiration is about 500 mm.
Soils
Soils at the Hubbard Brook are predominantly welldrained Spodosols (Typic Haplorthods) derived from glacial till, with sandy loam textures. They are acidic (pH about 4.5 or less) and relatively infertile (base saturation of mineral soil ~ 10 percent). Soil depths, including unweathered till, average about 2.0 m surface to bedrock, though this is highly variable. Depth to the C horizon averages about 0.6 m. At various places, the C horizon exists as an impermeable pan.
Vegetation
The present second-growth forest is even-aged and composed of about 80 to 90 percent northern hardwoods and 10 to 20 percent spruce-fir.
Research, Past and Present
At Hubbard Brook, the following topics are being
studied:
• The role of calcium supply in regulating the
structure and function of base-poor forest and
aquatic ecosystems
• Animal populations and communities
• Colder soils in a warmer world: a snow
manipulation in a northern hardwood forest
ecosystem
• Stream ecosystems
• A spatial model of soil parent material
• Modeling effects of acid deposition, forest
disturbance, and soil chemistry on forest
production and streamwater quality
• Remote sensing for measurement of canopy
nitrogen and calcium content, and estimation of
forest production and stream chemistry
• Landscape-scale controls on N retention and N
gas fluxes in the Hubbard Brook Valley
• Nutrient uptake at the ecosystem scale
• Carbon and calcium controls on microbial
biomass and invertebrate grazers
• Comparison of δ 15N and nitrification potential
across a nitrate-loss gradient
• Response of northern hardwood forests to
nutrient perturbation
• Edaphic controls on the structure and function of the northern hardwood forest
• Vegetation dynamics and primary productivity
Major Research Accomplishments and Effects on Management
At Hubbard Brook, the following subjects have been
researched:
• Small watershed technique for studying
biogeochemistry
• Factors regulating nutrient flux and cycling in
northern hardwood forests
• First documentation of acid rain in North
America
• Effects of forest harvesting disturbance on water
quality and quantity
• Long-term effects of acid rain on soil nutrient
pools and streamwater chemistry
• Relationship of interior forest bird populations
and communities to forest structure and
development
• Development and application of ecosystem
process models: 1) hydrological, 2) forest growth
and development, and 3) soil nutrient processes
Collaborators
At Hubbard Brook, collaborators include scientists from other Forest Service research units, Institute of Ecosystem Studies, Brown University, Dartsmouth College, Syracuse University, Cornell University, University of Michigan, Yale University, Appalachian State University, State University of New York-Environmental Science and Forestry, USDI Geological Survey, Wellesley College, University of New Hampshire, and Smithsonian Institution.
Research Opportunities
The Hubbard Brook staff welcomes new studies and collaboration on existing ones. There is a need for expanded cooperative research in the fields of soil physics and forest hydrology.
Facilities
The Robert S. Pierce Ecosystem Laboratory located at Hubbard Brook provides 835 m2 of space, including six offices, four laboratories, a conference room, six dormitory rooms, and a kitchen, baths, and showers. There is also a sample archive building and maintenance, storage, garage, and shop facilities.
Lat. 43°56′ N, long. 71°45′ W
Contact Information
Hubbard Brook Experimental Forest
USDA Forest Service
Northern Research Station
271 Mast Road
Durham, NH 03824
Tel: (603) 868-7636
Related Publications
Bailey, Amey Schenck; Hornbeck, James W.; Campbell, John L.; Eagar, Christopher. 2003. Hydrometeorological database for Hubbard Brook Experimental Forest: 1955-2000
Buso, Donald C.; Likens, Gene E.; Eaton, John S. 2000. Chemistry of precipitation, streamwater, and lakewater from the Hubbard Brook Ecosystem Study: a record of sampling protocols and analytical procedures
Holmes, Richard T.; Likens, Gene E. 1999. Organisms of the Hubbard Brook Valley, New Hampshire
Summary information presented here was originally published in:
Adams, Mary Beth; Loughry, Linda; Plaugher, Linda, comps. 2004. Experimental Forests and Ranges of the USDA Forest Service. Gen. Tech. Rep. NE-321. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station. 178 p.
Information may have been updated since original publication.
Last Modified: 07/25/2012