Ph.D., University of Georgia, Ecology, 1984;
B.A., University of Virginia, Environmental Science, 1980.

Assistant (1992), Associate (1993), Full (1996), Senior (2004) Scientist, Institute of Ecosystem Studies;

Assistant Professor, Department of Natural Resources Science, University of Rhode Island, 1987-1991;

Postdoctoral Research Associate, Departments of Crop and Soil Science and Microbiology and Public Health, Michigan State University, 1984-1987;

Graduate Research Assistant and Graduate Teaching Assistant, Institute of Ecology, University of Georgia, 1984-1987.

Peter M. Groffman has worked at the Hubbard Brook Experimental Forest since 1992. His research interests are in soil microbial ecology and carbon and nitrogen dynamics. Specific research efforts include long-term monitoring of soil microbial biomass and activity, investigation of snow depth as a regulator of soil freezing and nitrogen dynamics, the effects of atmospheric nitrogen deposition on nitrogen gas fluxes, and effects of a whole watershed calcium addition on soil nitrogen and carbon cycling.

Groffman was/is a member of the U.S. National Committee for Soil Science, the National Science Foundation Long Term Ecological Research Network Executive Board, the NOAA Gulf of Mexico Hypoxia Nutrient Reduction Workgroup and the Working Group on Aquatic Terrestrial Biogeochemistry at the National Center for Ecological Analysis and Synthesis. He was a lead author for the Second (Wetlands) and Third (North America) Assessment Reports of the Intergovernmental Program on Climate Change (IPCC). He currently serves on the editorial boards of Ecology and Ecosystems, and was chair of the Soil Ecology section of the Ecological Society of America from 1997 – 98 and the Wetland Soils Section of the Soil Science Society of America from 2002 - 2003.

Christenson, L.M., M.J. Mitchell, P.M. Groffman and G.M. Lovett. 2010. Winter climate change implications for decomposition in Northeastern forests: Comparisons of sugar maple litter to herbivore fecal inputs. Global Change Biology DOI: 10.1111/j.1365-2486.2009.02115.x

Groffman, P.M., K. Butterbach-Bahl, R.W. Fulweiler, A.J. Gold, J.L. Morse, E.K. Stander, C.L. Tague, C. Tonitto and P. Vidon. 2009. Challenges to incorporating spatially and temporally explicit phenomena (hotspots and hot moments) in denitrification models. Biogeochemistry 93:49-77. DOI: 10.1007/s10533-008-9277-5

Groffman, P.M., J.P. Hardy, M.C. Fisk, T.J. Fahey and C.T. Fahey. 2009. Climate variation and nitrogen and carbon cycle processes in a northern hardwood forest. Ecosystems 12: 927–943. DOI: 10.1007/s10021-009-9268-y.

Cleavitt, N.L., T. J. Fahey P.M. Groffman, J.P. Hardy, K.S. Henry, and C.T. Driscoll. 2008. Effects of soil freezing on fine roots in a northern hardwood forest. Canadian Journal of Forest Research 38:82-91.

Kulkarni, MV, P.M. Groffman and J.B. Yavitt. 2008. Solving the global nitrogen problem: It’s a gas! Frontiers in Ecology and Environment 4:199-206.

Steinweg, J.M., M.C. Fisk, B. McAlexander, P.M. Groffman and J. P. Hardy. 2008. Effects of soil freezing on soil particle size distributions and organic matter mineralization in a northern hardwood forest. Biology and Fertility of Soils 45:1-10.

Dittman, J.A., C.T. Driscoll, P. M. Groffman and T. J. Fahey. 2007. Dynamics of nitrogen and dissolved organic carbon at the Hubbard Brook Experimental Forest. Ecology 88:1153-1166.

Judd, K.E., G.E. Likens and P.M. Groffman. 2007. High nitrate retention during winter in soils of the Hubbard Brook Experimental Forest. Ecosystems 10:217-225.

Groffman, P.M., M.C. Fisk, C.T. Driscoll, G.E. Likens, T.J. Fahey, C. Eagar and L.H. Pardo. 2006. Calcium additions reduce nitrogen cycling in a northern hardwood forest. Ecosystems 9:1289-1305.

Groffman, P.M., J.P Hardy, C.T. Drisoll and T.J. Fahey. 2006. Snow depth, soil freezing and trace gas fluxes in a northern hardwood forest. Global Change Biology 12:1748-1760.

Groffman, P.M. J.S. Baron, T. Blett, A.J. Gold, I. Goodman, L.H. Gunderson, B.M. Levinson, M.A. Palmer, H.W. Paerl, G.D. Peterson, N. L. Poff, D.W. Rejeski, J.F. Reynolds, M.G. Turner, K.C. Weathers and J. Wiens. 2006. Ecological thresholds: The key to successful environmental management or an important concept with no practical application? Ecosystems 9:1-13.

Groffman P.M., M.A. Altabet, J.K. Böhlke, K. Butterbach-Bahl, M.B. David, M.K.Firestone, A.E. Giblin, T.M. Kana, L.P. Nielsen and M.A. Voytek. 2006. Methods for measuring denitrification: Diverse approaches to a difficult problem. Ecological Applications 16:2091-2122.

Groffman, P.M., R.T. Venterea, L.V. Verchot and C.S. Potter. 2006. Landscape and regional scale studies of nitrogen gas fluxes. Pages 191-203 In Scaling and Uncertainty Analysis in Ecology: Methods and Applications (J. Wu, K.B. Jones, H. Li, and O.L. Loucks, editors). Springer, New York.

Groffman, P.M., C.T. Driscoll, G.E. Likens, T.J. Fahey, R.T. Holmes, C. Eagar and J.D. Aber. 2004. Nor gloom of night: A new conceptual model for the Hubbard Brook ecosystem study. BioScience 54:139-148.

Groffman, P.M., C.T. Driscoll, C. Eagar, M.C. Fisk, T.J. Fahey, R.T. Holmes, G.E. Likens and L. Pardo. 2004. A new governance structure for the Hubbard Brook Ecosystem Study. Bulletin of the Ecological Society of America 85:5-6.

Venterea, R.T., G.M. Lovett, P.M. Groffman and P.A. Schwarz. 2003. Landscape patterns of soil nitrate production in a northern hardwood-conifer forest. Soil Science Society of America Journal. 67:527-539.

Fitzhugh, R.D., C.T. Driscoll, P.M. Groffman, G.L. Tierney, T.J. Fahey and J.P. Hardy. 2003. Soil freezing and the acid-base chemistry of soil solutions in a northern hardwood forest. Soil Science Society of America Journal 67:1897-1908.

Fiorentino, I., T.J. Fahey, P.M. Groffman, C.T. Driscoll, C. Eagar and T.G. Siccama. 2003. Initial responses of phosphorus biogeochemistry to calcium addition in a northern hardwood forest ecosystem. Canadian Journal of Forest Research 33:1864-1873.

Tierney, G.L., T.J. Fahey, P.M. Groffman, J. P. Hardy, R.D. Fitzhugh, C.T. Driscoll and J. B. Yavitt. 2003. Environmental control of fine root dynamics in a northern hardwood forest. Global Change Biology 9:670-679.

Groffman, P.M., C.T. Driscoll, T.J. Fahey, J.P. Hardy, R.D. Fitzhugh and G.L. Tierney. 2001. Colder soils in a warmer world: A snow manipulation study in a northern hardwood forest ecosystem. Biogeochemistry 56:135-150.

I am the Chair of the Hubbard Brook Committee of Scientists Scientific Coordinating Committee.