Paul J. Hanson, Environmental Sciences Division Staff, Oak Ridge National Laboratory

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Paul J. Hanson

Ecosystem and Plant Sciences Group
Environmental Sciences Division
Oak Ridge National Laboratory
Bethel Valley Road, Building 1062
Oak Ridge, TN 37831-6422
Phone: (865)574-5361
Fax: (865)576-9939
hansonpj@ornl.gov

Research Interests

Influence of climatic change on ecophysiological processes and tree growth
Chronic versus acute responses of forests to precipitation change
Forest carbon, water and nutrient cycling
Modeling soil surface CO₂ efflux and belowground carbon flux within deciduous forest ecosystems
Process-level physiological modeling
Deposition of trace gases to landscape surfaces (esp. forms of nitrogen)
Photosynthesis, respiration, and plant water relations of woody plants
Air pollution stress physiology (esp. ozone and nitrogen deposition)

Education/Employment History [ Top ]

Ph.D., University of Minnesota, Tree Physiology, 1986
M.S., University of Minnesota, Plant Physiology, 1983
B.S., St. Cloud State University, Biology, 1981 (summa cum laude)

Employment History:

Distinguished R&D Staff Member, Environmental Sciences Division, Oak Ridge National Laboratory, 2005-present
Group Leader, Ecosystem Sciences Group, Environmental Sciences Division, Oak Ridge National Laboratory, 2006-present
Chief Scientist, Program for Ecosystem Research, U.S. Department of Energy, 2004 - 2009
Senior R&D Scientist, Environmental Sciences Division, Oak Ridge National Laboratory, 2001 - 2004
Research Staff Member II, Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN., 1996- 2001
Adjunct Associate Professor, Department of Ecology, University of Tennessee, Knoxville, TN., 1994-1998
Research Staff Member I, Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN., 1992-95
Research Associate, Physiological Ecology Group, Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN., 1989-92
Scientist, Automated Sciences Group, Oak Ridge, TN., 1988-89
Postdoctoral Research Associate, Oak Ridge National Laboratory, Environmental Sciences Division, Oak Ridge, TN., 1986-88

Professional Activities and Affiliations [ Top ]

Activities:

Subject Editor, Global Change Biology, 2005 - present
Member, North American Carbon Program, Carbon Cycle Science Steering Group, 2009 - present
Invited Congressional Testimony, Energy and Environment Subcommittee of the House Science and Technology Committee, 9 June 2009
Member of EPA’s Clean Air Science Advisory Committee (CASAC) NOx & SOx Secondary Review Panel, 2007 - present
Member, NASA's ORNL DAAC User Working Group, 2007- present
Member of EPA’s Clean Air Science Advisory Committee (CASAC) Ozone Review Panel, 2005 - 2008
Member, National Institute for Global Environmental Change, National Technical Advisory Committee (NTAC), 2002 - 2004
Panel member, USDA-CSREES Competitive Grants Program, 2003
Editorial Review Board, Tree Physiology (1994 - 2004; not 1999)
Associate Editor, Journal of Environmental Quality, 1995-2000 (two 3-year terms)
Ad hoc member of a U.S. Environmental Protection Agency Technical Qualifications Board, 1998
Advisory Board Southeast Regional Center of National Institute For Global Environmental Change, 1996-1998
Panel Member, DOE's Southeast Regional Center -- National Institute For Global Environmental Change, 1994-1995
Contributing Author, U.S. Environmental Protection Agency, authored part of the revised Air Quality Criteria Document for Particulate Matter, 1994-1996
Panel Member, USDA's National Research Initiative Competitive Grants Program, 1992 & 1994
Grand Awards Judge, 43rd International Science and Engineering Fair, 1992
Contributing Author, U.S. Environmental Protection Agency, Authored part of the revised Air Quality Criteria Document for Oxides of Nitrogen, 1988-1990

Affiliations:

American Association for the Advancement of Science
American Geophysical Union - Biogeosciences
American Society of Agronomy
Ecological Society of America
Soil Science Society of America

Awards and Honors [ Top ]

Awards:

2004 Award for excellence in presentation of a paper, Soil Science Society of America, Division S-7, Annual meeting, October 31 - November 4, 2004, Seattle, Washington.
2003 Award of Merit for a Book, Society for Technical Communication.
2002 Award for excellence in presentation of a paper, Soil Science Society of America, Division S-7, Annual meeting, November 10-14, 2002, Indianapolis, Indiana.
1995 Distinguished Scientific Achievement Award, Environmental Sciences Division Oak Ridge National Laboratory.
1994 Award of Merit in Scholarly Articles, Society for Technical Communicaton

Honors:

Fellow, American Association for the Advancement of Science (AAAS), Section on Biological Sciences elected November 2008.
Sigma Xi, elected to full membership 1988.
Postdoctoral Fellowship, Oak Ridge Associated Universities, 1986-88.
Graduate School Fellowship, University of Minnesota, 1985.
Phi Kappa Phi, elected 1980.

Publications [ Top]

Book:

Hanson PJ, Wullschleger SD, Editors (2003) North American Temperate Deciduous Forest Responses to Changing Precipitation Regimes. Springer, New York, 421 p.

Articles (journal papers, book chapters, reports):

2009

Fröberg M, Hanson PJ, Trumbore SE, Swanston CW, Todd DE (2009) Flux of carbon from 14C-enriched leaf litter throughout a forest soil mesocosm. Geoderma 149:181-188.
Gaudinski JB, Torn MS, Riley WJ, Swanston C, Trumbore SE, Joslin JD, Majdi H, Dawson TE, Hanson PJ (2009) Use of stored carbon reserves in growth of temperate tree roots and leaf buds: analyses using radiocarbon measurements and modeling. Global Change Biology 15:992-1014.
Gu L, Pallardy SG, Hanson PJ, Wullschleger SD (2009) A comprehensive optimization method and its application to assessing uncertainties in estimated C3 biochemical parameters due to the use of different temperature dependence functions. Journal of Experimental Botany (submitted).
Hanson PJ, Classen AT, Kueppers LM, Luo Y, McDowell NG, Morris JT, Thornton PM, Dukes JS, Goulden ML, Melillo JM, Workshop Participants (2009) The Need for Next Generation Experiments to Understand Ecosystem Responses and Feedbacks to Climatic Change. Global Change Biology (submitted).
Kardol P, Todd DE, Hanson PJ, Mulholland PJ (2009) Long-term successional forest dynamics: species and community responses to climatic variability. Journal of Vegetation Science (submitted).
Riley WJ, Gaudinski JB, Torn MS, Joslin JD, Hanson PJ (2009) Fine-root mortality rates in a temperate forest: estimates using radiocarbon data and numerical modeling. New Phytologist (in press).
Yang B, Pallardy SG, Meyers TP, Gu L-H, Hanson PJ, Wullschleger SD, Heuer M, Hosman KP, Riggs JS, Sluss DW (2009) Environmental Controls on Water Use Efficiency during Severe Drought in an OzarkForest in Missouri, USA. Global Change Biology (submitted)

2008

Bernier P, Hanson PJ, Curtis PS (2008) Measuring litterfall and branchfall. Chapter 7 In: Hoover CM Ed., Field Measurements for Forest Carbon Monitoring, Springer, New York, pp. 91-101.
Fröberg M, Hanson PJ, Trumbore SE, Swanston CW, Todd DE Jr. (2008) Fluxes of carbon from ¹⁴C-enriched leaf litter in forest soil mesocosms. Geoderma (in press).
Fröberg M, Hanson PJ, Todd DE, Johnson DW (2008) Evaluation of effects of sustained decadal precipitation manipulations on soil carbon stocks. Biogeochemistry 89:151-161.
Gerten D, Luo Y, Le Maire G, Parton WJ, Keough C, Weng E, Beier C, Ciais P, Cramer W, Dukes JS, Sowerby A, Hanson PJ, Knapp AK, Linder S, Nepstad D, Rustad L, Sowerby A (2008) Modelled effects of precipitation on ecosystem carbon and water dynamics in different climatic zones. Global Change Biology 14:2365-2379.
Gu L, Hanson PJ, Post WM, Liu Q (2008) A novel approach for identifying the true temperature sensitivity from soil respiration measurements, Global Biogeochemical Cycles 22, GB4009, doi:10.1029/2007GB003164.
Gu L, Hanson PJ, Post WM, Kaiser DP, Yang B, Nemani R, Pallardy SG, Meyers T (2008) The April 2007 freeze in the eastern United States: its damage to vegetation and implication for terrestrial ecosystem structure and functioning in a warming climate. Bioscience 58:253-262.
Johnson DW, Todd DE Jr., Hanson PJ (2008) The effects of throughfall manipulation on soil nutrient status: results of 12 years of sustained wet and dry treatments. Global Change Biology 14:1661-1675.
Luo Y, Gerten D, Le Marie G, Parton WJ, Weng E, Zhou X, Keough C, Beier C, Ciais P, Cramer W, Dukes JS, Emmett B, Hanson PJ, Knapp A, Linder S, Nepstad D, Rustad L (2008) Modeled interactive effects of precipitation, temperature, and [CO2] on ecosystem carbon and water dynamics in different climatic zones. Global Change Biology 14:1986-1999.

2007

Cisneros-Dozal LM, Trumbore S, Hanson PJ (2007) Effect of moisture on leaf litter decomposition and its contribution to soil respiration in a temperate forest. Journal of Geophysical Research 112: G01013, doi:10.1029/2006JG000197.
Fröberg M, Jardine PM, Hanson PJ, Swanston CW, Todd DE, Tarver JR, Garten CT Jr. (2007) Low Dissolved Organic Carbon Input from Fresh Litter to Deep Mineral Soils. Soil Science Society of America Journal 71:347-354.
Hanson PJ, Kurz WA (2007) Commercial and project-based responses and associated research initiatives in the forest sector. In Freer-Smith PH, Broadmeadow MSJ, Lynch JM, Eds. Forestry and Climate Change, CAB International, pp. 226-232.
Hanson PJ, Tschaplinski TJ, Wullschleger SD, Todd DE Jr., Augé RM (2007) The Resilience of Upland-Oak Forest Canopy Trees to Chronic and Acute Precipitation Manipulations. In: Buckley DS and Clatterbuck WK, Eds, Proceedings 15th Central Hardwood Forest Conference, Knoxville, TN February 27–March 1, 2006, e-General Technical Report SRS–101, United States Department of Agriculture, Forest Service Southern Research Station, pp. 3-12
Garten CT Jr, Hanson PJ, Todd DE Jr, Lu BW, Brice DJ (2007) Natural 15N and 13C abundance as indicators of forest N status and soil C dynamics, pp. 61-82. IN (R.H. Michener and K. Lajtha, eds.) Stable Isotopes in Ecology and Environmental Science (second edition). Blackwell Science, Oxford.
Gu L, Meyers T, Pallardy SG, Hanson PJ, Yang B, Heuer M, Hosman KP, Liu Q, Riggs J, Sluss D, Wullschleger SD (2007) Influences of biomass heat and biochemical energy storages on the land surface fluxes and radiative temperature. Journal of Geophysical Research 112: D02107, doi:10.1029/2006JD007425
Luyssaert S, Inglima I, Jung M, Richardson AD, Reichstein M, Papale D, Piao S, Schulze E-D, Wingate L, Matteucci G, Aragao L, Aubinet M, Beer C, Bernhofer C, Black KG, Bonal D, Bonnefond JM, Chambers J, Ciais P, Cook B, Davis KJ, Dolman AJ, Gielen B, Goulden M, Grace J, Granier A, Grelle A, Griffis T, Grünwald T, Guidolotti G, Hanson PJ, Harding R, Hollinger D, Hutyra LR, Kolari P, Kruijt B, Kutsch W, Lagergren F, Laurila T, Law B, LeMaire G, Lindroth A, Loustau D, Malhi Y, Mateus J, Migliavacca M, Mission L, Montagnani L, Moncrieff J, Moors E, Munger JW, Nikinmaa E, Ollinger SV, Pita G, Rebmann C, Roupsard O, Saigusa N, Sanz MJ, Seufert G, Sierra C, Smith ML, Tang J, Valentini R, Vesala T, Janssens IA. (2007) CO2 balance of boreal, temperate, and tropical forests derived from a global database. Global Change Biology 13:2509-2537.
Mau J, Wang B, Dai Y, Woodward FI, and Hanson PJ, Lomas MR (2007) Improvements of a dynamic global vegetation model and simulations of carbon and water at an upland-oak forest. Advances in Atmospheric Sciences 24:311-322.
Pallardy SG, Gu L, Hanson PJ, Myers TP, Wullschleger SD,Yang B, Riggs JS, Hosman KP, Mark Heuer M (2007) Carbon Dioxide Fluxes in a Central Hardwoods Oak-hickory Forest Ecosystem. In: Buckley DS and Clatterbuck WK, Eds, Proceedings 15th Central Hardwood Forest Conference, Knoxville, TN February 27–March 1, 2006, e-General Technical Report SRS–101, United States Department of Agriculture, Forest Service Southern Research Station, pp. 13-20.
Yang B, Hanson PJ, Riggs JS, Pallardy SG, Hosman KP, Meyers TP, Wullschleger SD, Gu L (2007) Biases of CO2 storage in eddy flux measurements in a forest pertinent to vertical configurations of a profile system and CO2 density averaging. Journal of Geophysical Research 112; D20123, doi:10.1029/2006JD008243.

2006

Garten CT Jr., Hanson PJ (2006) Measured forest soil C stocks and estimated turnover times along an elevation gradient. Geoderma 136:342-352.
Grant RF, Zhang Y , Yuan F, Wang S, Hanson PJ, Gaumont-Guay D, Chen J, Black TA, Barr A, Baldocchi DD, Arain A (2006) Intercomparison of techniques to model water stress effects on CO2 and energy exchange in temperate and boreal deciduous forests. Ecological Modelling 196:289-312.
Gu LH, Meyers T, Pallardy SG, Hanson PJ, Yang B, Heuer M, Hosman KP, Riggs JS, Sluss D, Wullschleger SD (2006) Direct and indirect effects of atmospheric conditions and soil moisture on surface energy partitioning revealed by a prolonged drought at a temperate forest site. Journal of Geophysical Research-Atmospheres 111(D16): Art. No. D16102.
Jardine PM, Mayes MA, Mulholland PJ, Hanson PJ, Tarver J, Luxmoore RJ, McCarthy JF, Wilson GV (2006) Vadose zone flow and transport of dissolved organic carbon at multiple scales in humid regions. Vadose Zone Journal 5:140-152.
Joslin JD, Gaudinski JB, Torn MS, Riley WJ, Hanson PJ (2006) Fine root turnover patterns and their relationship to root diameter and soil depth in a 14C-labeled hardwood forest. New Phytologist 172:523-535.
Norby RJ, Wullschleger SD, Hanson PJ, Gunderson CA, Tschaplinski TJ, Jastrow JD (2006) CO2 enrichment of a deciduous forest: The Oak Ridge FACE Experiment. In Nösberger J, Long SP, Norby RJ, Stitt M, Hendrey GR, Blum H, Eds. Managed Ecosystems and CO2: Case Studies, Processes, and Perspectives Ecological Studies, Vol. 187. Springer, Berlin, pp. 231-251.
Wayson CA, Randolph JC, Hanson PJ, Schmid HP, Grimmond CSB (2006) Comparison of soil respiration methods in a mid-latitude deciduous forest. Biogeochemistry 80:173-189.
Wullschleger SD, Hanson PJ (2006) Sensitivity of canopy transpiration to altered precipitation in an upland oak forest: evidence from a long-term field manipulation study. Global Change Biology 12:97-109

2005

Cisneros-Dozal LM, Trumbore SE, Hanson PJ (2005) Partitioning sources of soil-respired CO2 and their seasonal variation using a unique radiocarbon tracer. Global Change Biology 12:194–204
Hanson PJ, Wullschleger SD, Norby RJ, Tschaplinski TJ, Gunderson CA (2005) Importance of changing CO2, temperature, precipitation, and ozone on carbon and water cycles of an upland oak forest: incorporating experimental results into model simulationd. Global Change Biology 11:1402-1423
Hanson PJ, Swanston CW, Garten CT Jr., Todd DE, Trumbore SE (2005) Reconciling Change in Oi-Horizon ¹⁴C With Mass Loss for an Oak Forest. Soil Science Society of America Journal 69:1492-1502
Swanston CW, Torn MS, Hanson PJ, Southon JR, Garten CT, Hanlon EM, Ganio L (2005) Initial characterizing processes of soil carbon stabilization using forest stand-level radiocarbon enrichment. Geoderma 128:52-62

2004

Hanson PJ, Amthor JS, Wullschleger SD, Wilson KB, Grant RF, Hartley A, Hui D, Hunt ER Jr., Johnson DW, Kimball JS, King AW, Luo Y, McNulty SG, Sun G., Thornton PE, Wang S, Williams M, Baldocchi DD, Cushman RM (2004) Oak forest carbon and water simulations: model intercomparisons and evaluations against independent data. Ecological Monographs 74(3):443-489
King JS, Hanson PJ, Bernhardt E, DeAngelis P, Norby RJ, Pregitzer KS (2004) A multiyear synthesis of soil respiration responses to elevated atmospheric CO₂ from four forest FACE experiments. Global Change Biology 10:1027-1042
Pendall E, Bridgham S, Hanson PJ, Hungate B, Kicklighter DW, Johnson DW, Law BE, Luo Y, Megonigal JP, Olsrud M, Ryan MG, Thornton P, Wan S (2004) Below-ground process responses to elevated CO₂ and temperature: a discussion of observations, measurement methods, and models. New Phytologist 162:311-322

2003

Edwards NT, Hanson PJ (2003) Aboveground autotrophic respiration. In: Hanson PJ, Wullschleger SD, Eds, North American Temperate Deciduous Forest Responses to Changing Precipitation Regimes. Springer, New York, pp. 48-66.
Hanson PJ, Ohara FM Jr (2003) Introduction. In: Hanson PJ, Wullschleger SD, Eds, North American Temperate Deciduous Forest Responses to Changing Precipitation Regimes. Springer, New York, pp. 3-7.
Hanson PJ, Edwards NT, Tschaplinski TJ, Wullschleger SD, Joslin JD (2003) Estimating the net primary and net ecosystem production of a southeastern upland Quercus forest from an 8-year biometric record. In: Hanson PJ, Wullschleger SD, Eds, North American Temperate Deciduous Forest Responses to Changing Precipitation Regimes. Springer, New York, pp. 378-395.
Hanson PJ, O’Neill EG, Chambers MLS, Riggs JS, Joslin JD, Wolfe MH (2003) Soil respiration and litter decomposition. In: Hanson PJ, Wullschleger SD, Eds, North American Temperate Deciduous Forest Responses to Changing Precipitation Regimes. Springer, New York, pp. 163-189.
Hanson PJ, Huston MA, Todd DE (2003) Walker Branch Throughfall Displacement Experiment (TDE) In: Hanson PJ, Wullschleger SD, Eds, North American Temperate Deciduous Forest Responses to Changing Precipitation Regimes. Springer, New York, pp. 8-31.
Hanson PJ, Todd DE, Johnson DW, Joslin JD (2003) Responses of Eastern Deciduous Forests to Precipitation Change. Chapter 10 In: McPherson GR, Weltzin JF, Eds. Changing Precipitation Regimes and Terrestrial Ecosystems, The University of Arizona Press, Tucson, pp. 164-179.
Hanson PJ, Todd DE, Joslin JD (2003) Canopy production. In: Hanson PJ, Wullschleger SD, Eds, North American Temperate Deciduous Forest Responses to Changing Precipitation Regimes. Springer, New York, pp. 303-315.
Hanson PJ, Todd DE, West DC, Edwards NT, Tharp ML, Simpson WA Jr. (2003) Tree and sapling growth and mortality. In: Hanson PJ, Wullschleger SD, Eds, North American Temperate Deciduous Forest Responses to Changing Precipitation Regimes. Springer, New York, pp. 255-273.
Johnson DW, Hanson PJ, Todd DE (2003) Nutrient availability and cycling. In: Hanson PJ, Wullschleger SD, Eds, North American Temperate Deciduous Forest Responses to Changing Precipitation Regimes. Springer, New York, pp. 396-414.
Todd DE, Hanson PJ (2003) Rates of coarse-wood decomposition. In: Hanson PJ, Wullschleger SD, Eds, North American Temperate Deciduous Forest Responses to Changing Precipitation Regimes. Springer, New York, pp. 210-214.
Tschaplinski TJ, Hanson PJ (2003) Dormant-season nonstructural carbohydrate storage. In: Hanson PJ, Wullschleger SD, Eds, North American Temperate Deciduous Forest Responses to Changing Precipitation Regimes. Springer, New York, pp. 67-84.
Wilson KB, Hanson PJ (2003) Deciduous Hardwood Photosynthesis: Species Differences, Temporal Patterns and Response to Soil Water Deficits. In: Hanson PJ, Wullschleger SD, Eds, North American Temperate Deciduous Forest Responses to Changing Precipitation Regimes. Springer, New York, pp. 35-47.
Wullschleger SD, Hanson PJ (2003) Sensitivity of sapling and mature-tree water use to altered precipitation. In: Hanson PJ, Wullschleger SD, Eds, North American Temperate Deciduous Forest Responses to Changing Precipitation Regimes. Springer, New York, pp. 87-99.
Wullschleger SD, Hanson PJ, Todd DE (2003) Forest water use and the influence of precipitation change. In: Hanson PJ, Wullschleger SD, Eds, North American Temperate Deciduous Forest Responses to Changing Precipitation Regimes. Springer, New York, pp. 363-377.

2002

Curtis PS, Hanson PJ, Bolstad P, Barford C, Randolph JC, Schmid HP, Wilson KB (2002) Biometric and eddy-covariance based estimates of annual carbon storage in five eastern North American deciduous forests. Agric For Meteorol 113:3-19.
Davidson EA, Savage K, Bolstad P, Clark DA, Curtis PS, Ellsworth DS, Hanson PJ, Law BE, Luo Y, Pregitzer KS, Randolph JC, Zak D (2002) Belowground carbon allocation in forests estimated from litterfall and IRGA-based soil respiration measurements. Agric For Meteor 113:39-51.
Ehman JL, Schmid HP, Grimmond CSB, Randolph JC, Hanson PJ, Wayson CA, Cropley FD (2002) An initial intercomparison of micrometeorological and ecological inventory estimates of carbon sequestration in a mid-latitude deciduous forest. Global Change Biology 8:575-589.
Gunderson CA, Sholtis JD, Wullschleger SD, Tissue DT, Hanson PJ, Norby RJ (2002) Environmental and stomatal control of photosynthetic enhancement in the canopy of a sweetgum (Liquidambar styraciflua L.) plantation during three years of CO₂ enrichment. Plant Cell and Environment 25:379-393.
Hanson PJ, one of 9 contributing authors. (2002) Chapter 4. Environmental Effects of Particulate Matter. In: Air Quality Criteria for Particulate Matter , U.S. Environmental Protection Agency, Washington, D.C.
Johnson DW, Hanson PJ, Todd DE (2002) The effects of throughfall manipulation on soil leaching in a deciduous forest. Journal of Environmental Quality 31:204-216.
Norby RJ, Hanson PJ, O’Neill EG, Tschaplinski TJ, Weltzin JF, Hansen RT, Cheng W, Wullschleger SD, Gunderson CA, Edwards NT, Johnson DW (2002) Net primary productivity of a ₂-enriched deciduous forest and the implications for carbon storage. Ecological Applications 12:1261-1266.
Trumbore S, Gaudinski JB, Hanson PJ, Southon JR (2002) A whole-ecosystem carbon-14 label in a temperate forest. EOS 83:265,267-268.
Wullschleger SD, Guderson CA, Hanson PJ, Wilson KB, Norby RJ (2002) Sensitivity of stomatal and canopy conductance to elevated CO₂ concentration – Interacting variables and perspectives of scale. New Phytologist 153:485-496.

2001

Dale VH, Joyce LA, McNulty S, Neilson RP, Ayres MP, Flannigan MD, Hanson PJ, Irland LC, Lugo AE, Peterson, CJ, Simberloff D, Swanson FJ, Stocks BJ, Wotton BM (2001) Forest disturbances and climate change. BioScience 51:723-734.
Hanson PJ, Todd DE, Riggs JS, Wolfe ME, O’Neill EG (2001) Walker Branch Throughfall Displacement Experiment Data Report: Site characterization, system performance, weather, species composition and growth. ORNL/CDIAC-134, NDP-078A. Carbon Dioxide Information Analysis Center, U.S. Department of Energy, Oak Ridge National Laboratory, Oak Ridge, Tennessee, U.S.A. 158 p.
Hanson PJ, Todd DE, Amthor JS (2001) A six year study of sapling and large-tree growth and mortality responses to natural and induced variability in precipitation and throughfall. Tree Physiology 21:345-358.
Joslin JD, Wolfe MH, Hanson PJ (2001) Factors controlling the timing of root elongation intensity in a mature upland oak-hickory stand. Plant and Soil 228:201-212.
Wilson KB, Baldocchi DD, Hanson PJ (2001) Leaf age affects the seasonal pattern of photosynthetic capacity and net ecosystem exchange of carbon in a deciduous forest. Plant Cell and Environment 24:571-583.
Wilson KB, Hanson PJ, Mulholland PJ, Baldocchi DD, Wullschleger SD (2001) A comparison of methods for determining forest evapotranspiration and its components across scales: sap-flow, soil water budget, eddy covariance, and catchment water balance. Agric For Meteor 106:153-168.
Wullschleger SD, Hanson PJ, Todd DE (2001) Transpiration from a multi-species deciduous forest as estimated by xylem sap flow techniques. Forest Ecology and Management 143:205-213.

2000

Ehman J, Schmid HP, Grimmond CSB, Hanson PJ, Randolph JC, Cropley FD (2000) A preliminary intercomparison of micrometeorological and ecological estimates of carbon sequestration in a mid-latitude deciduous forest. In R.J. de Dear, J.D. Kalma, T.R. Oke and A. Auliciems (eds). Biometeorology and Urban Climatology at the Turn of the Millenium, World Meteorological Organization, pp. 235-240.
Garten CT Jr., Cooper LW, Post WM III, Hanson PJ (2000) Climate controls on forest soil C isotope ratios in the southern Appalachian Mountains. Ecology 81:1108-1119.
Grimmond CSB, Hanson P, Schmid HP, Wullschleger S, Cropley F (2000) Evapotranspiration rates at the Morgan Monroe State Forest AmeriFlux Site: A comparison of results from eddy covariance turbulent flux measurements and sap flow techniques. 15th Conference on Hydrology, American Meteorological Society Long Beach, CA . January 2000, pp 158-161.
Hanson PJ (2000) Large-scale Water Manipulations. Chapter 23 in Sala OE, Jackson RB, Mooney HA, Howarth RW (Eds.) Methods in Ecosystem Science, Springer-Verlag, New York. pp. 341-352.
Hanson PJ, Edwards NT, Garten CT Jr., Andrews JA (2000) Separating root and soil microbial contributions to soil respiration: a review of methods and observations. Biogeochemistry 48:115-146.
Hanson PJ, Weltzin JF (2000) Drought disturbance from climate change: response of United States forests. Science of the Total Environment 262:205-220.
Johnson DW, Susfalk RB, Gholz HL, Hanson PJ (2000) Simulated effects of temperature and precipitation change in several forest ecosystems. Journal of Hydrology 235:183-204.
Joslin JD, Wolfe MH, Hanson PJ (2000) Effects of shifting water regimes on forest root systems. New Phytologist 147:117-129.
Wilson KB, Baldocchi DD, Hanson PJ (2000) Quantifying stomatal and non-stomatal limitations to carbon assimilation resulting from leaf aging and drought in mature deciduous tree species. Tree Physiology 20:787-797.
Wilson KB, Hanson PJ, Baldocchi DD (2000) Factors controlling evaporation and energy partitioning beneath a deciduous forest over an annual cycle. Agric For Meteorol 102:83-103.
Wilson KB, Baldocchi DD, Hanson PJ (2000) Spatial and seasonal variability of photosynthetic parameters and their relationship to leaf nitrogen in a deciduous forest. Tree Physiology 20:565-578.
Wullschleger SD, Wilson KB, Hanson PJ (2000) Environmental control of whole-plant transpiration, canopy conductance and estimates of the decoupling coefficient for large red maple trees. Agric For Meteorol 104:157-168.

1998-1999

Garten CT Jr., Post WM III, Hanson PJ, Cooper LW (1999) Forest soil carbon inventories and dynamics along an elevation gradient in the southern Appalachian Mountains. Biogeochemistry 45:115-145.
Hanson PJ, Todd DE, Huston MA, Joslin JD, Croker J, Augé. RM (1998) Description and field performance of the Walker Branch Throughfall Displacement Experiment: 1993-1996, ORNL/TM-13586, Oak Ridge National Laboratory, Oak Ridge, Tennessee.
Johnson DW, Hanson PJ, Todd DE, Susfalk RB, Trettin C (1998) Precipitation Change and Soil Leaching: Field Results and Simulations from Walker Branch Watershed, Tennessee. Water Air Soil Pollution 105:251-262.
Luxmoore RJ, Hanson PJ, Beauchamp JJ, Joslin JD (1998) Passive nighttime warming facility for forest ecosystem research. Tree Physiology 18:615-623.
Lindberg SE, Hanson PJ, Meyers TP, Kim KH (1998) Air/surface exchange of mercury vapor over forests: the need for a reassessment of continental biogenic emissions. Atmospheric Environment 32:895-908.
Wullschleger SD, Hanson PJ, Tschaplinski TJ (1998) Whole-plant water flux in understory red maple exposed to altered precipitation regimes. Tree Physiology 18:71-79.

1996-1997

Hanson PJ, Tabberer TA, Lindberg SE (1997) Emissions of mercury vapor from tree bark. Atmospheric Environment 31:777-780.
Kim K-H, Hanson PJ, Barnett MO, Lindberg SE (1997) Biogeochemistry of mercury in the air-soil-plant system. In H. Sigel and A. Sigel, eds. Metal Ions in Biological Systems, Vol. 34: Mercury and Its Effects on Environment and Biology. Basel, Hong Kong, pp. 185-212.
Edwards NT, Hanson PJ (1996) Stem respiration in a closed-canopy upland oak forest. Tree Physiology 16:433-439.
Wullschleger SD, Hanson PJ, Todd DE (1996) Measuring stem water content in four deciduous hardwoods with a time-domain reflectometer. Tree Physiology 16: 809-815.
Wullschleger SD, Hanson PJ, Edwards GS (1996) Growth and maintenance respiration in leaves of northern red oak seedlings and mature trees after three years of ozone exposure. Plant Cell Environment 19:577-584.

1995

Hanson PJ, Todd DE, Edwards NT, Huston MA (1995) Field performance of the Walker Branch Throughfall Displacement Experiment, In: A. Jenkins, R.C. Ferrier, and C. Kirby, eds., Ecosystem Manipulation Experiments: scientific approaches, experimental design and relevant results, Ecosystem Research Report #20, Commission of the European Communities, pp. 307-313.
Hanson PJ, Lindberg SE, Tabberer TA, Owens JG, Kim K-H (1995) Foliar Exchange of Mercury Vapor: Evidence for a Compensation Point. Water Air Soil Pollution 80:373-382.
Kelly JM, Samuelson L, Edwards G, Hanson P, Kelting D, Mays A, Wullschleger S (1995) Are seedlings reasonable surrogates for trees? an analysis of ozone impacts on Quercus rubra. Water Air Soil Pollution 85:1317-1324.
Tschaplinski TJ, Stewart DB, Hanson PJ, Norby RJ (1995) Interactions between drought and elevated CO₂ on growth and gas exchange of seedlings of three deciduous tree species. New Phytologist 129:63-71.
Wullschleger SD, Norby RJ, Hanson PJ (1995) Growth and maintenance respiration in stems of Quercus alba after four years of CO₂ enrichment. Physiologia Plantarum 93:47-54.

1994

Hanson PJ, Samuelson LJ, Wullschleger SD, Tabberer TA, Edwards GS (1994) Seasonal patterns of light-saturated photosynthesis and leaf conductance for mature and seedling Quercus rubra L. Foliage: Differential sensitivity to ozone. Tree Physiology 14:1351-1366.
Hanson PJ, Hoffman WA (1994) Emissions of non-CH₄ organic compounds and CO₂ from forest floor cores. Soil Science Society of America Journal 58:552-555.
McLaughlin SB, Layton PA, Adams MB, Edwards NT, Hanson PJ, O’Neill EG, Roy WK (1994) Growth responses of 53 open-pollinated loblolly pine families to ozone and acid rain. Journal of Environmental Quality 23:247-257.

1993

Hanson PJ, Wullschleger SD, Bohlman SA, Todd DE (1993) Seasonal and topographic patterns of forest floor CO₂ efflux from an upland oak forest. Tree Physiology 13:1-15.
Kim K-H, Lindberg SE, Hanson PJ, Meyers TP, Owens J (1993) Applications of micrometeorological methods to measurements of mercury emissions over contaminated soils. In Proc. Ninth International Conference on Heavy Metals in the Environment, Toronto, Canada, Vol 1, pp. 328-331.
Luxmoore RJ, Wullschleger SD, Hanson PJ (1993) Forest responses to CO₂ enrichment and climate warming. Water Air Soil Pollution 70:309-323.
Turner RS, Hanson PJ, Huston MA, Garten CT Jr., Mulholland PJ (1993) A large-scale throughfall manipulation experiment on Walker Branch Watershed. In: Rasmussen L, Brydges T, Mathy P (Eds), Experimental Manipulations of Biota and Biogeochemical Cycling in Ecosystems: Approach - Methodologies - Findings, Commission of the European Communities, Copenhagen, Denmark, pp. 96-105.

1992

Hanson PJ, Garten CT Jr. (1992) Deposition of H¹⁵NO₃ to white oak, red maple, and loblolly pine foliage: experimental observations and a generalized model. New Phytologist 122:329-337.
Hanson PJ, Taylor GE Jr., Vose JM (1992) Measurements of reactive nitrogen gas deposition to forest landscape surfaces: biological and environmental controls. In: D.W. Johnson and S.E. Lindberg, eds. Atmospheric Deposition and Nutrient Cycling in Forest Ecosystems, Springer-Verlag, New York, pp. 166-177.
Hanson PJ, Turner RS (1992) Nitrogen deposition to forest ecosystems: forms, regional inputs, and effects. Proceedings of the 1992 Air and Waste Management Association Annual Meeting, Kansas City, MO, paper No. 92 71.04.
Pier PA, Thornton FC, McDuffie C Jr., Hanson PJ (1992) CO₂ exchange rates of red spruce during the second season of exposure to ozone and acidic cloud deposition. Environmental and Experimental Botany 32:115-124.
Taylor GE Jr., Hanson PJ (1992) Forest trees and tropospheric ozone: role of canopy deposition and leaf uptake in developing exposure-response relationships. Agric Ecosys Environ 42:255-273.
Wullschleger SD, Hanson PJ, Sage RF (1992) PHOTOBIO: Modeling the stomatal and biochemical control of plant gas exchange. J Nat Res Life Sci Educ 21:141-145.
Wullschleger SD, Hanson PJ, Gunderson CA (1992) Assessing the influence of exogenous ethylene on electron transport and fluorescence quenching in leaves of Glycine max. Environmental and Experimental Botany 32:449-455.

1991

Hanson PJ, Lindberg SE (1991) Dry deposition of reactive nitrogen compounds: a summary of leaf canopy and nonfoliar measurements. Atmospheric Environment 25A:1615-1634.
Hanson PJ (one of 6 contributing authors) (1991) Chapter 10. The effects of nitrogen oxides on natural ecosystems and their composition. In: Air Quality Criteria for Oxides of Nitrogen, Vol II., U.S. Environmental Protection Agency, Washington, D.C.
McLaughlin SB, Anderson CP, Hanson PJ, Tjoelker MG, Roy WK (1991) Increased dark respiration and calcium deficiency of red spruce in relation to acidic deposition at high elevation Southern Appalachian Mountain Sites. Canadian Journal of Forest Research 21:1234-1244.
Wullschleger SD, Oosterhuis DM, Hurren RG, Hanson PJ (1991) Evidence for light-dependent recycling of respired carbon dioxide by the cotton fruit. Plant Physiology 97:574-579.

1990

Garten CT, Hanson PJ (1990) Foliar retention of ¹⁵N-nitrate and ¹⁵N-ammonium by red maple (Acer rubrum) and white oak (Quercus alba) leaves from simulated acid rain. Environmental and Experimental Botany 30:333-342.
Hanson PJ, Taylor GE Jr. (1990) Modeling pollutant gas uptake by leaves: an approach based on physicochemical properties. In Dixon R et al. (Eds), Process Modeling of Forest Growth Responses to Environmental Stress, Timber Press, Portland, Oregon, pp. 351-356.
Hanson PJ, McLaughlin SB (1990) Continuous gas exchange measurements using individual fascicle cuvettes: the "tubule" system. In Payer HD, Pfirrmann T, Mathy P (Eds) Environmental Research With Plants in Closed Chambers, Air Pollution Research Report No. 26, Commision of the European Communities, pp. 143-147.
Hanson PJ, McLaughlin SB, Garten CT Jr. (1990) Application of artificial rain in experimental systems: methods, results of case studies, and future needs. In Payer HD, Pfirrmann T, Mathy P (Eds) Environmental Research With Plants in Closed Chambers, Air Pollution Research Report No. 26, Commision of the European Communities, pp. 223-233.
Taylor GE Jr, Hanson PJ, Lindberg SE (1990) Deposition and emission of trace gases in controlled environments: A conceptual model, experimental methodologies, and application of results to the disciplines of physiological ecology and biogeochemistry. In Payer HD, Pfirrmann T, Mathy P (Eds) Environmental Research With Plants in Closed Chambers, Air Pollution Research Report No. 26, Commision of the European Communities, pp. 194-215.

1989

Hanson PJ, Rott K, Taylor GE Jr., Lindberg SE, Gunderson CA, Ross-Todd BM (1989) NO₂ deposition to elements of a forest landscape. Atmospheric Environment 23:1783-1794.
Hanson PJ, Taylor GE Jr, Lindberg SE, Lovett GM (1989) Deposition of reactive nitrogen gases to landscape surfaces. 1988 Annual Report of the Integrated Forest Study, ORNL/TM-11121, Oak Ridge National Laboratory, Oak Ridge, Tennessee, pp. 96-100.
Hanson PJ, McLaughlin SB (1989) Growth, photosynthesis, and chlorophyll concentrations of red spruce seedlings treated with mist containing H₂O₂. Journal of Environmental Quality 18:499-503.
Norby RJ, Weerasuriya Y, Hanson PJ (1989) Induction of nitrate reductase activity in red spruce needles by NO₂ and HNO₃ vapor. Canadian Journal of Forest Research 19:889-896.
Taylor G, Lindberg S, Hanson P, Garten C. (1989) Atmospheric-canopy exchange in forests. Oak Ridge National Laboratory Review, Oak Ridge National Laboratory, Oak Ridge, Tennessee, pp. 90-96.

1988

Hanson PJ, McLaughlin SB, Edwards NT (1988) Net CO₂ exchange of Pinus taeda shoots exposed to variable ozone levels and precipitation chemistries in field and laboratory settings. Physiologia Plantarum 74:635-642.
Hanson PJ, Isebrands JG, Dickson RE, Dixon RK (1988) Ontogenetic patterns of CO₂ exchange of Quercus rubra L. leaves during three flushes of shoot growth I. Median Flush leaves. Forest Science 34:55-68.
Hanson PJ, Isebrands JG, Dickson RE, Dixon RK (1988) Ontogenetic patterns of CO₂ exchange of Quercus rubra L. leaves during three flushes of shoot growth II. Insertion gradients of leaf photosynthesis. Forest Science 34:69-76.
Hanson PJ, McLaughlin SB (1988) Net carbon dioxide exchange characteristics of Pinus taeda L. shoots. In Comparative Sensitivity, Mechanisms, and Whole Plant Physiological Implications of Responses of Loblolly Pine Genotypes To Ozone and Acid Deposition, ORNL/TM-10777, Oak Ridge National Laboratory, Oak Ridge, Tennessee, pp. 96-123.
Hanson PJ, McLaughlin SB, Adams MB, Edwards NT (1988) Three techniques for measuring photosynthesis of loblolly pine shoots: comparisons between techniques and their relationship to seedling growth. In Comparative Sensitivity, Mechanisms, and Whole Plant Physiological Implications of Responses of Loblolly Pine Genotypes To Ozone and Acid Deposition, ORNL/TM-10777, Oak Ridge National Laboratory, Oak Ridge, Tennessee, pp. 241-254.
Taylor GE Jr, Hanson PJ, Baldocchi DD (1988) Pollutant deposition to individual leaves and plant canopies: site of regulation and relationship to injury. In Heck WW, Taylor OC, Tingey DT (Eds) Assessment of Crop Loss From Air Pollutants, Elsevier Publishers, pp. 227-257.

1987

Hanson PJ, Dixon RK, Dickson RE (1987) Effect of container size and shape on the growth of northern red oak seedlings. HortScience 22:1293-1295.
Hanson PJ, McRoberts RE, Isebrands JG, Dixon RK (1987) An optimal sampling strategy for determining CO₂ exchange rate as a function of photosynthetic photon flux density. Photosynthetica 21:98-101.
Hanson PJ, Dixon RK (1987) Allelopathic effects of interrupted fern on norhtern red oak seedlings: amelioration by Suillus luteus L:Fr. Plant and Soil 98:43-51.
Hanson PJ, Isebrands JG, Dickson RE (1987) Carbon budgets of Quercus rubra L. seedlings at selected stages of growth: Influence of light. In Central Hardwood Forest Conference VI. Knoxville, Tennessee, Feb. 24-26, pp. 269-276.

1985-1986

Hanson PJ, Dickson RE, Isebrands JG, Crow TR, Dixon RK (1986) A morphological index of Quercus seedling ontogeny for use in studies of physiology and growth. Tree Physiology 2:273-281.
Hanson PJ, Sucoff EI, Markhart AH III (1985) Quantifying apoplastic flux through red pine root systems using trisodium 3-hydroxy- 5,8,10- pyrenetrisulfonate. Plant Physiology 77:21-24.
Hanson PJ, Dixon RK (1985) Allelopathic inhibition of northern red oak by interrupted fern and goldenrod. In Proc. Fifth Central Hardwood Forest Conference, University of Illinois, Urbana-Champaign, IL, April 15-17, pp. 269-274.