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Tracking the Fate of Plagioclase Weathering Products: Pedogenic and Human Influences

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Year Published

2020

Publication

In: Dontsova, Katerina; Balogh-Brunstad, Zsuzsanna; Le Roux,Gaël, eds. Biogeochemical Cycles: Ecological Drivers and Environmental Impact, Geophysical Monograph 251, First Edition. © 2020 American Geophysical Union. John Wiley & Sons, Inc: 151-162. Chapter 7.

Abstract

Catchment mass balance demonstrates the role of hydrologic, pedogenic, and human influences on cycling of Ca, Al, Na, and Si, derived from plagioclase dissolution. As Na is little taken up by vegetation, does not accumulate in secondary soil pools, and is primarily in plagioclase, net Na output is a measure of plagioclase dissolution. Net Na flux is proportional to streamflow, illustrating hydrologic control of weathering. Rates of Ca, Al, and Si release from mineral dissolution are more difficult to evaluate as they are variably taken up by vegetation or stored in secondary soil pools. However, plagioclase stoichiometry provides a benchmark by which the net storage or release of these elements may be gauged. Net export of Ca relative to Na shows that Ca export was enhanced in the 1960s, peaking in the 1970s, taken as an indication of acid deposition effects on the soil exchange pool, which were further exacerbated by harvesting treatments. Net export of Si and Al relative to Na suggest dynamic biotic Si pools and provide a measure of the podzolization soil development process. Net catchment export ratios provide a tool for comparing biogeochemical processes across catchments and a basis for investigating processes controlling pool accumulation.

Citation

Bailey, Scott W. 2020. Tracking the Fate of Plagioclase Weathering Products: Pedogenic and Human Influences. In: Dontsova, Katerina; Balogh-Brunstad, Zsuzsanna; Le Roux,Gaël, eds. Biogeochemical Cycles: Ecological Drivers and Environmental Impact, Geophysical Monograph 251, First Edition. © 2020 American Geophysical Union. John Wiley & Sons, Inc: 151-162. Chapter 7. DOI:10.1002/9781119413332. https://doi.org/10.1002/9781119413332.ch7.

Last updated on: June 10, 2022