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Nitrogen

microbial isotopic fractionation and soil organic matter decomposition

http://www.springerlink.com/content/j63164631wp46188/

Variations in microbial isotopic fractionation during soil organic matter decomposition, T. Z. Lerch, N. Nunan, M.-F. Dignac, C. Chenu and A. Mariotti. 2011. Biogeochemistry.

Nitrogen from Rocks!!

NPR coverage

http://www.npr.org/2011/09/06/140206913/discovery-forces-scientists-to-r...

http://www.nature.com/nature/journal/v477/n7362/full/nature10415.html

Increased forest ecosystem carbon and nitrogen storage from nitrogen rich bedrock

Scott L. Morford, Benjamin Z. Houlton & Randy A. Dahlgren

Nature 477, 78–81 (01 September 2011) doi:10.1038/nature10415

Increases in the flux of carbon belowground stimulate nitrogen uptake and sustain the long-term enhancement of forest productivity under elevated CO2

Drake, JE, Budynek AG-, Hofmockel KS, Bernhardt ES, Billings SA, Jackson RB.  2011.  Increases in the flux of carbon belowground stimulate nitrogen uptake and sustain the long-term enhancement of forest productivity under elevated CO2. Ecology Letters. 14

Stoichiometric Effects on Plant Communities

Nutrient supply, as well as the relative ratios of nutrients (stoichiometry), have huge impacts on plant growth and community composition by altering which species groups dominate in a community (Klausmeier et al. 2004; Silvertown et al. 2006; Harpole & Tilman 2007). Fertilization tends to decrease species richness (Suding et al. 2005). This loss of species can in turn affect community stability (Tilman & Downing 1994) and ecosystem functioning (Naeem & Li 1997; Hooper et al. 2005).

Orwin 2011 Ecology Letters Organic nutrient uptake by mycorrhizal fungi enhances ecosystem carbon storage: a model-based assessm

http://onlinelibrary.wiley.com/doi/10.1111/j.1461-0248.2011.01611.x/pdf

Ramirez et al. 2010. Ecology. Consistent effects of N fertilization on soil bacterial communities in contrasting systems

http://www.esajournals.org/doi/pdf/10.1890/10-0426.1

Nitrogen and phosphorus enrichment and AOB - Lage and Martiny, ISME 2010

http://www.nature.com/ismej/journal/v4/n7/full/ismej201010a.html

Sarah Hargreaves

I am a PhD Candidate in the Ecology and Evolutionary Biology Program. I am interested in the effect of environmental gradients and land management on microbial community abundance and activity and, in turn, how changes in microbial communities feedback to influence nutrient cycling. My research focuses on the effect of alternative biomass cropping systems on carbon and nitrogen cycling, with specific focus on denitrification at the Landscape Biomass Project @ the Uthe Farm.
Email: sharg(at)iastate.edu
Website: http://sharg.public.iastate.edu

Kirsten Hofmockel

Kirsten Hofmockel is an assistant professor in the Ecology, Evolution and Organismal Biology Department at Iowa State University.  She directs the Microbial Ecology Laboratory, which focuses on connecting microscale mechanism to ecosystem-scale biogeochemical processes.
khof@iastate.edu
515-294-2589

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Research Project: 
Denitrification in prairie potholes

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