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Contribution of Calcium Oxalate to Soil-Exchangeable Calcium

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Title Contribution of Calcium Oxalate to Soil-Exchangeable Calcium
Names Dauer, Jenny M. (creator)
Perakis, Steven S. (creator)
Date Issued 2013-12 (iso8601)
Note To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by Lippincott Williams & Wilkins and can be found at: http://journals.lww.com/soilsci/pages/default.aspx.
Abstract Acid deposition and repeated biomass harvest have decreased
soil calcium (Ca) availability in many temperate forests worldwide, yet
existing methods for assessing available soil Ca do not fully characterize
soil Ca forms. To account for discrepancies in ecosystem Ca budgets, it
has been hypothesized that the highly insoluble biomineral Ca oxalate
might represent an additional soil Ca pool that is not detected in standard
measures of soil-exchangeable Ca. We asked whether several standard
method extractants for soil-exchangeable Ca could also access Ca held in
Ca oxalate crystals using spike recovery tests in both pure solutions and
soil extractions. In solutions of the extractants ammonium chloride, ammonium
acetate, and barium chloride, we observed 2% to 104% dissolution
of Ca oxalate crystals, with dissolution increasing with both solution molarity
and ionic potential of cation extractant. In spike recovery tests using
a low-Ca soil, we estimate that 1 M ammonium acetate extraction dissolved
sufficient Ca oxalate to contribute an additional 52% to standard measurements
of soil-exchangeable Ca. However, in a high-Ca soil, the amount
of Ca oxalate spike that would dissolve in 1 M ammonium acetate extraction
was difficult to detect against the large pool of exchangeable
Ca. We conclude that Ca oxalate can contribute substantially to standard
estimates of soil-exchangeable Ca in acid forest soils with low soil-exchangeable
Ca. Consequently, measures of exchangeable Ca are unlikely
to fully resolve discrepancies in ecosystem Ca mass balance unless the
contribution of Ca oxalate to exchangeable Ca is also assessed.
Genre Article
Topic Calcium oxalate
Identifier Dauer, J. M., & Perakis, S. S. (2013). Contribution of Calcium Oxalate to Soil-Exchangeable Calcium. Soil Science, 178(12), 671-678. doi:10.1097/SS.0000000000000029

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