| Dr.
Lisa
Kellman
Canada Research Chair in Environmental Sciences (II) and Associate Professor Department of Earth Sciences and Environmental Sciences Research Centre (ESRC) St. Francis Xavier University P.O. Box 5000, Antigonish, NS, Canada, B2G 2W5 Tel.: 902-867-5086 Fax: 902-867-2414 E-mail: lkellman@stfx.ca
Academic and Administrative Appointments
Research Interests My primary interests center upon the dynamics of natural biogeochemical processes in soil and freshwater environments, and how these have been altered by changes associated with global climate and landuse in temperate and boreal ecosystems. My main contributions to this field of research range from understanding nitrogen cycling in aquatic agricultural ecosystems, to the effects of forest management activities on soil carbon and nitrogen storage, and soil-atmosphere greenhouse gas exchanges. Application of stable isotope techniques has been and continues to be of particular interest in my past, current and future research plans. Students Current Graduate Students: Carrie-Ellen Gabriel PhD Candidate, Dalhousie University, Quantification of the role of moisture in microbial respiration of mineral soils in a managed red spruce forest. [NSERC PGS-D Award recipient] Kristie Mahoney MSc Candidate, St. Francis Xavier University, Dynamics of N2O soil-atmosphere exchanges across a harvested forest chronosequence. Amy Myette MSc Candidate, St. Francis Xavier University [Part Time] Using soil CO2 profiles to understand subsurface gas production processes: Examples from two forest - clearcut pairs Current Post Doctoral Fellows: Erin Smith (PhD), Agricultural nitrogen cycling and stable isotopic analysis. Previous Graduate Students (since 2002): Amanda Diochon PhD, Dalhousie University [NSERC CGS award recipient] The size, structure, and mineralization potential of the soil organic carbon pool in a managed red spruce (Picea Rubens Sarg.) forest chronosequence. [NSERC PDF Award recipient] Carrie-Ellen Gabriel, MSc, St. Francis Xavier University [NSERC PGS-M award recipient] Examination of the Effectsof Moisture and Temperature on Soil Organic Matter Decomposition: Results of a Long-Term Incubation of Shallow and Deep Red Spruce Forest Soil Cores. David Risk, PhD, Dalhousie University, 2006 [NSERC PGS-D award recipient] Exploring the environmental sensitivity of natural CO2 emissions: Do roots and soil microbes respond to different climatic clues? Krista Kavanaugh, MSc, St. Francis Xavier University, 2007 Soil nitrous oxide dynamics associated with forest harvesting in a transitional temperate-boreal forest ecosystem David Risk, MSc, St. Francis Xavier University, 2002 Determining the physical controls on carbon dioxide production in the soil profile: Studies from four sites in Eastern Canada Previous Post Doctoral Fellows: Amanda Diochon (PhD) Soil C dynamics and methane from northern soils. Present position: PDF, Agriculture Canada. Sanjeev Kumar (PhD) Soil N mineralization and nitrous oxide dynamic investigations using stable N isotopes. Present position: PDF University of Victoria Asfaw Bekele (PhD) Soil carbon dynamics in harvested forests. Present position: Research Scientist, Imperial Oil, AB. Current and Previous Undergraduate Thesis/Project Students (since 2002): Larissa Allain, BSc Environmental Sciences and Chemistry, 2010, Investigation of the priming effect in the evolution of CO2 from soil organic matter in northern forest soils. Mike MacDougall BSc Interdisciplinary Studies in Aquatic Resources and Earth Sciences, 2008 Changes in shallow groundwater chemistry due to forest clear-cutting and regrowth Kristie Mahoney, BSc Earth Sciences, 2005 A comparative study estimating carbon dioxide production in the organic soil horizon Shari Hayne, BSc Earth Sciences, 2004 [NSERC PGS-M award recipient] Soil carbon storage across a landuse transect. Craig Power BSc Earth Sciences and Mathematics, 2003[NSERC PGS-M award recipient] Nitrogen fertilization and trace gas emissions from soils Erica Gillis BSc, ISAR – Earth Sciences, 2003 The Bunyon Pond water quality and land use project Scott Rayner BSc ISAR – Earth Sciences, 2002 [NSERC PGS-M award recipient] Groundwater and soil gas pollutant plume monitoring and remediation at a contaminated compressor station, Alberta Current Courses ESCI 271 Environmental Earth Science In this course we examine the relationships between Earth surface processes and human activities. We take an Earth System Science approach to examining human-induced chemical alteration of the atmosphere, continents and fresh water systems. We examine processes that have altered atmospheric, soil, and continental freshwater systems, with a particular emphasis upon contamination issues. Three credits and lab. ESCI 406 Advanced Environmental Geochemistry In this course we examine a selection of topics in environmental geochemistry and biogeochemistry. We take a process-based approach to examining cycling and contamination in atmospheric, soil and aquatic environments from an Earth systems science perspective with an emphasis upon stable isotope geochemistry. General lectures will provide a background of the various topics covered in the course. There is a large seminar component to the course in which students will review current literature and journal articles. Lab assignments will acquaint students with analytical approaches to environmental analyses, as well as the design and implementation of environmental research projects. ENSC 491 Environmental Sciences Seminar (Coordinator) ENSC 493 Environmental Sciences Thesis (Coordinator) Examples of published research contributions since 2002: Risk, D., L. Kellman and M. Moroni. (2009) Characterization of variability and spatial patterns in tree and soil δ13C at research sites in eastern Canada. Isotopes in Environment and Health 45, 220-230. Diochon, A., L. Kellman (2009) Physical fractionation of soil organic matter: Destabilization of deep soil carbon following harvesting of a temperate coniferous forest, J. Geophys. Res., 114, G01016, doi:10.1029/2008JG000844. Diochon, A. L. Kellman and H. Beltrami (2009) Looking deeper: an investigation of soil carbon losses following harvesting from a managed northeastern red spruce (Picea rubens Sarg.) forest chronosequence, Forest Ecology and Management, 257, 2, 31 January 2009, Pages 413-420, doi:10.1016/j.foreco.2008.09.015. Risk, D., L Kellman, H. Beltrami and A. Diochon* (2008) In-situ incubations highlight the environmental constraints on soil organic carbon decomposition. Environmental Research Letters, 3 (2008) 044004, doi:10.1088/1748-9326/3/4/044004. Kellman, L. and K. Kavanaugh* (2008) Nitrous oxide dynamics in managed northern forest soil profiles: is production offset by consumption?, Biogeochemistry, (Ms BIOG935) In press. Diochon*, A. and L. Kellman (2008) Natural abundance measurements of 13C indicate increased deep soil carbon mineralization after forest disturbance. Geophysical Research Letters, 35, L14402, doi:10.1029/2008GL034795. Risk, D., L. Kellman (2008) Isotopic fractionation in non-equilibrium diffusive environments. Geophysical Research Letters, 35, L02403, doi:10.1029/2007GL032374. Risk, D., L. Kellman and H. Beltrami (2008) A new method for in-situ soil gas diffusivity measurement and applications in the monitoring of subsurface CO2. Journal of Geophysical Research- Biogeosciences, 113, G02018, doi:10.1029/2007JG000445. Bekele, A., L. Kellman, and H. Beltrami (2007) Soil profile CO2 concentrations variations from forested and clear cut sites in Nova Scotia, Canada, Forest Ecology and Management, 242, 587-597, doi:10.1016/j.foreco.2007.01.088. Kellman, L., H. Beltrami, and D. Risk (2007), Changes in seasonal soil respiration with pasture conversion to forest in Atlantic Canada , Biogeochemistry, 82, 101-109, doi:10.1007/s10533-006-9056-0. Beltrami, H., E. Bourlon, L. Kellman, and J.F. González-Rouco. (2006) Spatial patterns of ground heat gain in the northern hemisphere, Geophysical Research Letters, Vol. 33, L06717, doi:10.1029/2006GL025676, 2006. Pitcher, A.M., J. Ollerhead, L. Kellman, D. Risk and D.A. Campbell (2006) Evidence of Subsurface Pooling of CH4 in Saltmarsh Sediments in the Musquash Estuary, New Brunswick, Proceedings of the Canadian Coastal Conference. Kellman, L. (2005). A study of tile drain - d15N values: Implications for the identification of nitrate sources in agricultural regions, Nutrient Cycling in Agroecosystems, 71, 131-137, 2005. Kellman, L. (2004). Nitrate retention in a first-order stream: Reconciling laboratory and field measurements, Biogeochemistry, 71, 89-105 Kellman, L. and C. Hillaire-Marcel (2003). Evaluation of nitrogen isotopes as indicators of contamination sources in an agricultural watershed, Agriculture, Ecosystems and Environment, 95, 87-102 Beltrami, H. and L. Kellman (2003). An examination of short and long term air-ground temperature coupling at sites subjected to strong seasonal variations, Global and Planetary Change, 38, 291-303. Risk*, D., L. Kellman, and H. Beltrami (2002). Soil CO2 production and surface flux at four climate observatories in eastern Canada, Global Biogeochemical Cycles, 16 (4), 1122, doi:10.1029/2001GB001831. Risk*, D., L. Kellman, and H. Beltrami (2002). Carbon dioxide in soil profiles: Production and temperature dependency , Geophysical Research Letters, 29 (6), 1087, doi:10.1029/2001GL014002. |
