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| Göttlein, A; Stanjek, H: Micro-scale variation of solid-phase properties and soil solution chemistry in a forest podzol and its relation to soil horizons, European Journal of Soil Science, 47, 627-636 (1996) | |
Abstract:
In order to evaluate micro-scale heterogeneities 55 micro suction cups were placed in an array
at 15 mm intervals in a profile face of a cambic podzol. The chemistry of soil solution (mineral
anions, pH, UV absorption as a measure for DOC) was compared with solid-phase properties
from soil samples (2 cm’ volume), which had surrounded the suction cups. Sequential extraction
techniques (water, NhCl, hydroxylamin-hydrochloride, citrate-bicarbonate, oxalate, dithionitecitrate-
bicarbonate) and base titrations were applied to characterize the solid phase. Although the
average soil solution concentrations between horizons often differed significantly, the spatial
distributions of pH and SO:- did not correlate with soil horizon borders. Even if concentration
isolines and soil horizon borders were parallel, marked concentration gradients could be observed
within individual soil horizons. The less intense the interaction between solute ion and soil matrix,
the greater was the variation in solution concentration within a soil horizon. For the soil solid
phase only a weak correlation of slow buffer reactions to soil horizons was found. The distribution
of extractable Fe and Al was typical for a podzol profile, however, with very steep gradients
within single soil horizons. Except for pH, which was related mainly to citrate-bicarbonate
extractable aluminium, no solid-phase characteristic showed a clear correlation with soil solution
chemistry. |
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