Michelle McCrackin

Michelle McCrackin

Title PhD Student
email: mlmccrac@asu.edu

For my dissertation research, I am investigating the influence of atmospheric nitrogen (N) deposition on nutrient cycling in lake sediments. I am interested in denitrification, a biogeochemical process that may permanently remove N from ecosystems by converting reactive N species to N2 gas. I am also interested in the consequences of N loading on the production of nitrous oxide, an obligate intermediary product of denitrification and a potent green house gas. Investigating the effects of N deposition on lakes is critical as such elevated inputs can compromise the delivery of important ecosystem services. Active denitrification can substantially mitigate these negative impacts and, hence, I am interested in understanding the factors that control denitrification in lake sediments.

Publication:

McCrackin, M.L., T.K. Harms, N.B. Grimm, S. Hall, and J.P. Kaye. 2008. Responses of soil microorganisms to resource availability in urban, desert soils. Biogeochemistry 87: 143-155.