Stream Water Chemistry near the KBS LTER

Water chemistry data are collected approximately 4-5 times/year from streams near Kellogg Biological Station. Sampling is done at least one week after rainfalls greater than one inch, or equivalent snowmelt, and thus do not represent ephemeral discharge peaks. The following chemical variables are measured on filtered water (0.45 micron) unless noted: Ca, Mg, Na, K, nitrate, total alkalinity (unfiltered water), chloride, sulfate, ammonium, soluble reactive phosphorus (PO4-P), total dissolved phosphorus (TDP), dissolved organic carbon (DOC), dissolved Si, and specific conductance. Beginning in August 2006 dissolved Ca, Mg, Na and K were measured by ion chromatography instead of flame atomic absorption spectrophotometry. The pH is measured in the field (streams). Additional field measurements include water temperature and dissolved oxygen as percent and mg/l, and additional lab measurements include total suspended solids and total phosphorus (TP). Stream discharge is measured at a nearby site on Augusta Creek by the USGS. Several other local stream sites are also sampled in this way; contact Dr. Hamilton for details. See the following reference for methods:Hamilton, S.K., J.L. Tank, D.F. Raikow, W.M. Wollheim, B.J. Peterson, and J.R. Webster. 2001. Nitrogen uptake and transformation in a midwestern US stream: A stable isotope enrichment study. Biogeochemistry 54(3): 297-340.