Abstract
Soil moisture (θ) changes modify the electrical conductivity of the soil
solution (ECw) by varying the amount and composition of
dissolved ions, their activity coefficients, and soil tortuosity.
Theoretically expected, it was experimentally confirmed that the contribution
of common reactions (precipitation–dissolution,
adsorption–desorption, and complexation) to solute composition is not
always a linear function of soil : water ratios. Using the driest or wettest q
as references, correcting for dilution only when θ changed, did not fully
reconstruct the salinity. Bulk soil EC
(ECa)–ECw linkage, based on
the same mechanisms, is shown to have variable, curvilinear relations for
soils of medium salinity levels, which are enhanced by the presence of
sparingly soluble salts and clay content. An extreme disagreement between
ECw and ECc (EC of 1 : 1 soil :
water extracts adjusted for θ) was found for a clay soil, where up to ~2
dS/m the slope was negative.
Subject
Earth-Surface Processes,Soil Science,Environmental Science (miscellaneous)
Cited by
11 articles.
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