Summer 2016 - Present
Nitrogen cycling and nutrient removal in agricultural watersheds
Impacts of conservation and best management practices on nitrogen removal via denitrification
Developing models to predict seasonal nitrogen removal in the agricultural landscape
Watershed monitoring in the two agricultural watersheds under cover crop and two-stage ditch conservation practices
Continuous nitrate monitoring using sensors to examine storm influence on nitrate concentrations
Recovery time of biogeochemical processes, specifically denitrification, following the construction of a two-stage ditch
Using oxygen stable isotopes to determine groundwater influence in agricultural streams
Texas Christian University, B.S. in Biology & Spanish (2014, summa cum laude)
University of Arkansas, M.S. in Crop, Soil, & Environmental Sciences (2016)
Speir, S.L., M.M. Chumchal, R.W. Drenner, W.G. Cocke, M.E. Lewis, and H.J. Whitt. 2014. Methyl mercury and stable istopes of nitrogen reveal that a terrestrial spider has a diet of emergent aquatic insects. Environmental Toxicology and Chemistry. 33(11): 2506-2509.
Speir, S.L., J.M. Taylor, and J.T. Scott. Seasonal variation in denitrification in ditch sediments vegetated with rice cutgrass (Leersia oryzoides) across a nitrate gradient. Journal of Environmental Quality. In Review.
Speir, S.L., J.M. Taylor, and J.T. Scott. The influence of scale on application of nitrogen gas flux models to estimate denitrification rates in experimental systems vegetated with cutgrass (Leersia oryzoides). Journal of Environmental Quality. In Prep.