Evidence for effects of CO2 on soil solution chemistry in Spodosols by a simple in-field extractor

Martin Kaupenjohann, Mark B. David

Research output: Contribution to journalArticlepeer-review

Abstract

Degassing of CO2 during collection of soil solution may alter the chemical composition of the solution, especially in well-buffered soils. We used a simple syringe extractor for field sampling of soil solution along with ambient soil air in order to test the influence of degassing of CO2 on solution pH in acid soils (Spodosol B and C horizons collected in Central Maine, USA). Soil air concentrations of CO2 varied from 0.36 to 1.35 ml l-1 during sampling immediately after snow melt. Degassing increased solution pH by 0.3 to 0.5 pH units. Both in-situ and degassed pH were predicted by the Reuss and Johnson soil chemical equilibrium model. The results suggest, (i) that the simple method is useful for determination of solution from wet soil under ambient soil air conditions and (ii) that degassing plays a significant role for soil solution chemistry even in Spodosol B and C horizons.

Original languageEnglish (US)
Pages (from-to)195-198
Number of pages4
JournalZeitschrift fur Pflanzenernahrung und Bodenkunde
Volume159
Issue number2
DOIs
StatePublished - Apr 1996

ASJC Scopus subject areas

  • Soil Science

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