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Evidence for effects of CO 2 on soil solution chemistry in spodosols by a simple in‐field extractor
Author(s) -
Kaupenjohann Martin,
David Mark B.
Publication year - 1996
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.1996.3581590215
Subject(s) - podzol , soil water , chemistry , environmental chemistry , soil science , environmental science , inorganic chemistry
Abstract Degassing of CO 2 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 CO 2 on solution pH in acid soils (Spodosol B and C horizons collected in Central Maine, USA). Soil air concentrations of CO 2 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.