Interaction of Brilliant Blue dye solution with soil and its effect on mobility of compounds around the zones of preferenial flows at spruce stand

Abstract

We performed field experiment with 10 g l −1 concentration of Brilliant Blue solutes in 100 l of water sprinkling on 1 × 1 m surface of the Dystric Cambisol. Consequently, four vertical profiles were exposed at experimental plot after 2 hours (CUT 2), 24 hours (CUT 24), 27 hours (CUT 27) and after 504 hours (CUT 504) in order to analyse spatiotemporal interactions among the BB solution (Na-salts), soil exchangeable complex and fine earth soil (%) samples extracted from both the high and low coloured zones located around the optically visualised macropore preferred flow (PF) zones. The concentration changes were quantifying via soil profiles not affected by BB (termed as REF) located in the close vicinity of experimental plot. Observed changes in pH (H 2 O), chemical composition of fineearth soil, as well as in concentration of Na + in soil exchangeable complex to suggest, the BB dye solution didn't represent an inert tracer, but compounds strongly involved in reaction with surrounding soils. Recorded chemical trends seems to be the result both the competitive processes between the Na + of BB dye solution and composition of surrounding soil exchangeable complex, as well and the spatial-temporal controlled mechanism of dye solution transfer in soil.

The study of flow type dynamics at pedon scale via morphometric parameter analysis of dye-pattern profiles

“…It was found that the application of BB dye solution abruptly increased the pH (H 2 O) values in all profiles (CUT 2-CUT 504) of the experimental plot, and that the comparison with REF profiles revealed the gradual drop in pH (H 2 O) from CUT 2 to CUT 504 profiles. Bebej et al (2017) have documented also the changes of Na + concentration (cmol c kg −1 ) in the soil exchangeable complex extracted from the zones of macropore PF of CUT 2 -CUT 504 profiles, analogous with those described for pH (H 2 O).…”

“…objects (SPW < 20 mm) with small V v is located in this line, but high S V value is observed here (ten intercepts is visible in this line) Dye pattern profiles and corresponding dye pattern coverages (bottom) of CUT 2 (a), CUT 24 (b), CUT 27 (c) and CUT 504 (d) profiles (adapted fromBebej et al, 2017).…”

“…On the other hand, the morphometric parameters of stained objects seemed to be sensitive enough to track these processes. Bebej et al (2017) have reported the physical-chemical changes caused by the application of Brilliant Blue dye (pH = 7) on acidic soils (pH < 4.0) from the same experiment. It was found that the application of BB dye solution abruptly increased the pH (H 2 O) values in all profiles (CUT 2-CUT 504) of the experimental plot, and that the comparison with REF profiles revealed the gradual drop in pH (H 2 O) from CUT 2 to CUT 504 profiles.…”

“…The results of all above mentioned independent and indirect methods of dye solution flow were summarised and evaluated by Bebej et al (2017). It was also found that according to the USDA soil taxonomy, the soil samples taken from both the experimental and the REF plots were classified as sandy clay loam (usually, samples from 0.1 to 0.5 m depth), and sandy loam (samples below 0.5 m), and no significant texture differences were found between the experimental and the REF plots.…”

“…The silicate analyses of fine earth soil samples taken from the soil profiles of REF plots showed no differences in chemical and mineralogical composition of soil. Considering the skeleton composition, its volumetric content, soil textures and chemical composition of fine earth we can propose that the working hypothesis about the spatial representativeness of soil pedon body within the REF and the experimental plots is valid, and that the observed changes in dye pattern profiles will minimally reflect spatial variations existing within the pedon body under investigation (Bebej et al, 2017).…”