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Helgason, Bobbi, Ph. D.

Research Scientist, Soil Molecular Microbiologist

Contact Information:

51 Campus Drive
Saskatoon, Saskatchewan S7N 5A8
Telephone: 306-975-6510
Fax: 306-966-4226
Email: bobbi.helgason@agr.gc.ca

Areas of Expertise:

  • Soil microbial diversity in sustaining cropping systems
  • Microbial processes influencing soil carbon and nitrogen cycling
  • Microbial communities in no-till systems
  • Use of stable isotopes (13C and 15N) to study microbial turnover of C and N in soil

Current Projects:

  • Climate change factors influencing microbial turnover of soil organic matter
  • Long-term agricultural production effects on soil microbial diversity
  • Use of archived soils to study the effects of agricultural management on microbial functional groups
  • Links between nitrifier and denitrifier communities and N2O production in N fertilized soils with a long-term history of manure application

Affiliations:

  • Adjunct Professor, University of Saskatchewan, Department of Soil Science

Research publications

2015

  • Gillespie, A.W., Gregorich, E.G., Peak, D., and Helgason, B.L. (2015). "Instrumental Methods in Environmental Biogeochemistry.", - Encyclopedia of Analytical Chemistry, John Wiley & Sons, Ltd.
  • Gregorich, E.G., Janzen, H.H., Helgason, B.L., and Ellert, B.H. (2015). "Nitrogenous gas emissions from soils and greenhouse gas effects.", Advances in Agronomy (Book series), 132, pp. 39-74. doi : 10.1016/bs.agron.2015.02.004

2014

Other science related publications

2016

  • Helgason, B.L. (2016). "Nurturing soil microbial partners for healthy agroecosystems.", Saskatchewan Soil Conservation Association Annual Conference, January 11, 2016.

2015

  • Arcand, M.A. and Helgason, B.L. (2015). "Carbon limitation constrains soil microbial activity and influences microbial community composition in soils under organic management.", Canadian Society of Soil Science Annual Conference, Montreal, QC, Canada, July 2015.
  • Arcand, M.A. and Helgason, B.L. (2015). "Thermodynamic profiles and carbon use efficiency of microbial communities in agricultural soils.", Canadian Society of Soil Science Annual Conference, Montreal, QC, Canada, July 2015.
  • Bedard-Haughn, A., Pennock, D.J., and Helgason, B.L. (2015). "What lies beneath: Carbon in wetland and buried soils.", Grassland Carbon Workshop, Edmonton, AB, Canada, April 14, 2015.
  • Blain, N.P., Germida, J.J., and Helgason, B.L. (2015). "A survey of bacterial root endophytes associated with vegetation at the Bitumount Provincial Historic Site in Alberta, Canada.", 65th Annual Canadian Society of Microbiologists Annual Conference, University of Regina, Regina, Saskatchewan, Canada, June 15-18, 2015.
  • Diochon, A., Gregorich, E.G., Ellert, B.H., Janzen, H.H., and Helgason, B.L. (2015). "The role of temperature and soil texture in decomposition: findings from a physical fractionation study.", Canadian Society of Soil Science Annual Conference, Montreal, QC, Canada, July 2015.
  • Helgason, B.L. (2015). "A bug’s eye view: soil management effects on microbial biodiversity. The place of soil.", Soils and Crops Workshop 2015, University of Saskatchewan, Saskatoon, SK, Canada, March 16-17, 2015.
  • Helgason, B.L. (2015). "Buried carbon, hidden microbes: biological mechanisms stabilize carbon in soil organic matter.", Composting Council of Canada Annual Conference, Gatineau, QC, Canada, September 15-18, 2015.
  • Helgason, B.L. (2015). "Wheat-associated microbial communities under long-term nitrogen and phosphorus deficiency.", Canadian Wheat Alliance Annual Meetings, Saskatoon, SK, Canada, July 15-16, 2015.
  • Helgason, B.L., Kuzmicz, S.C., Janzen, H.H., Gillespie, A.W., Hemmingsen, S.M., Yergeau, E., Greer, C.W., Germida, J.J., and Leinweber, P. (2015). "Historical Rotation ABC: changes in microbial community dynamics over 100 years of wheat production.", Canadian Society of Soil Science Annual Conference, Montreal, QC, Canada.
  • Katulanda, P., Walley, F.L., and Helgason, B.L. (2015). "13C cellulose assimilation in different transplanted Chernozems after 21 years of common management and climatic conditions.", Canadian Society of Soil Science Annual Conference, Montreal, QC, Canada, July 2015.
  • VandenBygaart, A.J., Helgason, B.L., Konschuh, H.J., Bedard-Haughn, A., Gillespie, A.W., and Gregorich, E.G. (2015). "Stability of buried soil organic matter in cropland: What are the mechanisms?", Canadian Society of Soil Science Annual Conference, Montreal, QC, Canada, July 2015.
  • Wang, X., Westbrook, C., Helgason, B.L., and Bedard-Haughn, A. (2015). "Assessing pedogenic controls on carbon mineralization, organic matter composition and microbial community dynamics in a mountain peatland.", Canadian Society of Soil Science Annual Conference, Montreal, QC, Canada, July 2015.

2014

  • Arcand, M.A., Helgason, B.L., Lemke, R.L., and Ellert, B.H. (2014). "Soil microbial communities and carbon utilization in diversified long-term conventional and organic management systems.", Ecological Society of America Annual Meeting, Sacramento, CA, USA, August, 2014, Presentation.
  • Banerjee, S.M., Helgason, B.L., Wang, L., Winsley, T., Ferrari, B., and Siciliano, S.D. (2014). "Antecedent Moisture Controls N2O Emissions and N-Cycling Communities in Semi-Arid Agricultural Soils.", International Society of Microbial Ecology International 13th Symposium, Soul, South Korea, August, 2014.
  • Blain, N.P., Helgason, B.L., and Germida, J.J. (2014). "Microbial communities associated with the natural vegetation at the Bitmount Provincial Historic Site, Alberta.", Canadian Society of Soil Science Annual Meetings, Banff, AB, Canada, May 4-7, 2014, Presentation.
  • Ellert, B.H., Helgason, B.L., Janzen, H.H., and Gregorich, E.G. (2014). "Soil Disturbance Effects on Plant Residue Decay in Canadian Agricultural Soils.", Canadian Society of Soil Science Annual Meetings, Banff, AB, Canada, May 2014.
  • Gregorich, E.G., Ellert, B.H., Helgason, B.L., and Janzen, H.H. (2014). "Soil disturbance effects on decomposition of plant residues in Canadian agricultural soils.", 20th World Congress of Soil Science, Jeju, South Korea, June, 2014, Presentation.
  • Gregorich, E.G., Ellert, B.H., Janzen, H.H., and Helgason, B.L. (2014). "Plant residue decay in diverse Canadian Soils.", American Society of Agronomy Annual Meetings, Long Beach, CA, USA, November 2014, Presentation.
  • Gregorich, E.G., Ellert, B.H., Janzen, H.H., and Helgason, B.L. (2014). "Plant residue decay in diverse Canadian soils.", 20th World Congress of Soil Science, Jeju, South Korea, June 8-13, 2014, Presentation.
  • Helgason, B.L., Banerjee, S.M., Wang, L., Winsley, T., Ferrari, B., and Siciliano, S.D. (2014). "Antecedent Moisture Controls N2O Emissions and N-Cycling Communities in Semi-Arid Agricultural Soils.", Canadian Society of Soil Science Annual Meetings, Banff, AB, Canada, May 2014.
  • Helgason, B.L., Kuzmicz, S.C., Janzen, H.H., Gillespie, A.W., Hemmingsen, S.M., Yergeau, E., Greer, C.W., Germida, J.J., and Leinweber, P. (2014). "Historical Rotation ABC: microbial community structure and diversity over 100 years of wheat production.", 1st global Soil Biodiversity Conference, Dijon, France, December 2014, Presentation.
  • Helgason, B.L., VandenBygaart, A.J., Konschuh, H.J., Bedard-Haughn, A., Gillespie, A.W., and Gregorich, E.G. (2014). "Buried C in croplands: How biologically available is it?", Soil Organic Matter 6 Workshop, Kiawah Island, SC, USA, October, 2104, Presentation.
  • Katulanda, P., Walley, F.L., and Helgason, B.L. (2014). "C substrate utilization potential of different Chernozems after 21 years transplanting to common management and climatic conditions.", American Society of Agronomy Annual Meetings, Long Beach, CA, USA, November 2014, Presentation.
  • Katulanda, P., Walley, F.L., and Helgason, B.L. (2014). "Comparison of microbial communities in different soils after 21 years of transplantation to a common location.", Soils and Crops Workshop 2014, University of Saskatchewan, Saskatoon, SK, Canada, March 11-12, 2014.
  • Katulanda, P., Walley, F.L., and Helgason, B.L. (2014). "Evaluation of Microbial Communities of Different Dark Brown Chernozems after 21 Years of Common Management and Climatic Conditions.", Canadian Society of Soil Science Annual Meetings, Banff, AB, Canada, May 2014.
  • Pearce, R., Helgason, B.L., Lemke, R.L., and Farrell, R.E. (2014). "Are N2O emissions from long-term manure applications linked to microbial abundance?", Canadian Society of Soil Science Annual Meetings, Banff, AB, Canada, May 4-7, 2014, Presentation.
  • Pearce, R., Lemke, R.L., Helgason, B.L., and Farrell, R.E. (2014). "Assessing Potential Soil Microbial “Priming Effects” on N2O Emissions as a Result of a Fertilizer Change-Over from Long-Term Manure Applications to Urea.", Soils and Crops Workshop 2014, University of Saskatchewan, Saskatoon, SK, Canada, March 11-12, 2014.
  • VandenBygaart, A.J., VandenBygaart, A.J., Gregorich, E.G., and Helgason, B.L. (2014). "Carbon Dynamics in Eroded Landscapes: Is Buried Soil Organic Matter Biologically Available?", Canadian Society of Soil Science Annual Meetings, Banff, AB, Canada, May 4-7, 2014, Presentation.

2013

  • Katulanda, P., Helgason, B.L., and Walley, F.L. (2013). "Assessing microbial communities in different soils after transplantation to a common location.", Soils and Crops Workshop 2013, Prairieland Park, Saskatoon, SK, Canada, March 5-6, 2013.
  • Kuzmicz, S.C. and Helgason, B.L. (2013). "100 years of farming: long-term differences in cropping intensity and N fertilization impact microbial community structure.", Soils and Crops Workshop 2013, Prairieland Park, Saskatoon, SK, Canada, March 5-6, 2013.
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