Soil chemistry on Watershed 1:

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Presentation transcript:

Soil chemistry on Watershed 1: 1998 - 2014 Chris Johnson Syracuse University

Wollastonite Addition: W1, October 1999 www.hubbardbrook.org

Motivation and Hypotheses “Replace” Ca depleted from soils by: Acid rain Successional vegetation growth Soil Hypotheses: Wollastonite application will result in increased total and exchangeable Ca in W1 soils. Increases in exchangeable Ca will be accompanied by decreased exchangeable acidity (Al + H). …causing soil pH and base saturation to increase. Soil chemical change will occur over many years, in a “chromatographic” manner.

Changes in Exchangeable Ca in W1 Soils 1998-2014: Exchangeable calcium increased in all sampled layers after wollastonite treatment. Exchangeable acidity (Al+H) declined in all layers, though Ca increases generally exceeded acidity declines. Data reflect a progressive downward migration of Ca in the soil. Significant changes were detected in the Oi+Oe horizon in 2000, while changes did not occur until 2002 in the Oa horizon, and 2006 in the mineral soil.

Changes in Soil pH and Base Saturation

Is Watershed 1 Losing Soil Organic Matter?

Is Watershed 1 Losing Soil Organic Matter? It does not appear to be a sampling issue.

Is Watershed 1 Losing Soil Organic Matter?

Possibilities Worms? [They are out there.] Higher OM solubility at higher pH? [There has been little or no change in soil solution DOC.] Enhanced decomposition? Treatment-related? [Groffman sees few differences between W1 and (west of) W6.] Climate-related? [W6 OM mass may be declining as well.]

Is Watershed 1 Losing Soil Organic Matter? Woods Lake Data: Melvin et al. (2013)

“Punch List” Digestions/total elemental analysis (esp. Ca) Organically bound Al (CuCl2 extraction) Total Acidity (buffered BaCl2 extraction)