Extractable soil cations (K, Ca, Mg, Na) for intertussock O and B horizon soils on moist acidic and non-acidic tundra.
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On 7 August 1997, we collected 5.2-cm diameter soil cores (up to 30 cm depth depending on depth of thaw) from six randomly selected locations (between tussocks) at each site. The cores were separated into organic and mineral horizons, all live plant material and coarse roots were removed, and each horizon from each core was homogenized separately. Dried and ground soils (using a coffee grinder) for each horizon and from each of the six locations at each site were analyzed for exchangeable base cations (Ca, Mg, K, Na) using ammonium acetate extraction followed by ICP (Thomas 1982). Soils within horizons and sites were bulked for analyses of cation exchange capacity and percent base saturation, determined by the sum of base cations extracted with ammonium acetate followed by ICP and exchangeable acidity extracted by barium chloride (Thomas 1982; Soil Conservation Service 1992). Analyses were done at the University of Minnesota's Research Analytical Laboratory..
Calculations: Kcmol (Kppm x 100)/(39.1 x 1000)
Cacmol (Cappm x 100 x 2)/(40.1 x 1000)
Mgcmol (Mgppm x 100 x 2)/(24.3 x 1000)
Nacmol (Nappm x 100)/(22.9 x 1000)
Reference Citations: Hobbie, SE and L Gough. In press. Foliar and soil nutrients in tundra on glacial landscapes of contrasting ages in northern Alaska. Oecologia
Version 2: Checked file and created eml and html files. Feb 2006 Jiml
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Version 4: Upadte LTERNET Data Access server proxy link for Excel and comma delimited data files. Changed from knb to das in url.
Version 5: Fixed discrepency with header variable names. Updated metadata form to newer version (without site sheet). CH 24 Jan 2013. Updated to newer metadata with site sheet. CH March 2013.
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