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Long-Term Ecological Research (LTER)/HFR004: Ecosystem Response to Chronic Nitrogen Additions
Entry ID: LTER_HFR004

Abstract: HFR004: Nitrogen is being added as ammonium nitrate at rates of 50 and
150 kg/ha-yr in oak-maple and red pine stands. Measurements include nitrogen mineralization, litter decomposition, tree growth, foliar chemistry, litter chemistry, and CH4, CO2, and N2O fluxes.

The Harvard Forest LTER site (HFR) is primarily Eastern deciduous forest. Research topics include: long-term climate change; disturbance history and vegetation dynamics; comparison of community, population, and plant architechtural responses to human and natural disturbances; forest-atmosphere trace gas fluxes; organic matter accumulation, decomposition and mineralization; element cycling, fine root dynamics and forest microbiology.

Information about LTER is also available on-line at
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Description: Access to HFR-LTER datasets.
Geographic Coverage
Spatial coordinates   
  N: 42.0   S: 42.0   E: -71.0   W: -71.0
Max Altitude: SURFACE

Temporal Coverage
Start Date: 1988-05-08
Originating Center
Data Center
Harvard Forest, Long-Term Ecological Research Network Office Supplemental Info
Data Center URL:
Dataset ID: HFR004

Data Center Personnel
Phone: 508-724-3302
Fax: 508-724-3595
Email: rlent at
Contact Address:
Harvard University
Harvard Forest
P.O. Box 68
City: Petersham
Province or State: MA
Postal Code: 01366
Country: USA
Phone: 603-862-3045
Email: John.Aber at
Contact Address:
University of New Hampshire
Complex Systems Research Center
City: Durham
Province or State: NH
Postal Code: 03824
Country: USA
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Aber, J.D., J.M. Melillo, C. McClaugherty and K.N. Eshleman. 1983.
"Potential sinks for mineralized nitrogen following disturbance in
forest ecosystems". Ecological Bulletin (Stockholm), Vol. 35, pp
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Extended Metadata Properties
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Creation and Review Dates
Last DIF Revision Date: 2017-08-23