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Sediments for nutrient analysis were collected with a Sutar box corer (0.5 m2) following the methods of Carrick et al. (2005). Two box cores were taken at each site, and the overlying water was gently siphoned from the sediment surface (leaving approximately 2-4 cm of undisturbed, overlying water). Intact sediments samples (duplicate) were removed from each box core using plexiglass core tubes (12 cm2). Once retrieved, the top 1cm of surficial sediments was extruded through the top of the core tube and placed in a beaker; this subsample was diluted to a known volume to create a slurry from which subsequent biogeochemical measure were made. Sediment C, N, and P concentrations were measured on whole subsamples of the slurry (12 ml). Finally, sediment chlorophy concentrations were measured by concentrating subsamples of the slurry onto membranes (Carrick 2004).
Hunter J. Carrick, Ph.D.
School of Forest Resources
Pennsylvania State University
434 Forest Resources Building
University Park, PA 16802
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