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- Title
\textbf{Effect of Anisotropy on Solute Transport and Phosphate Release from Peatlands }.
- Authors
Wang, Miaorun; Liu, Haojie; Zak, Dominik; Lennartz, Bernd
- Abstract
Peat soils are heterogeneous, anisotropic porous media. To date, there is still limitedunderstanding of contaminant transport in anisotropic and heterogeneous peat soils. In thisstudy, we aimed to explore the effect of anisotropy on solute transport and phosphate releasefrom peat soils. Undisturbed soil cores (vertical and horizontal directions) were collectedfrom one drained and one restored peatland both in a comparable state of degradation.Saturated hydraulic conductivity (Ks) and chemical peat properties were determined for allsoil cores. Miscible displacement experiments were conducted on soil cores under saturatedsteady state conditions using KBr as a conservative tracer. The results showed that (1) the Ksin vertical direction (Ksh) was significantly higher than that in horizontal direction (Ksv),indicating that Ksbehavesanisotropic; (2) solute transport parameters (D and β)as derived from model optimization employing the mobile and immobile modelexhibited likewise anisotropic behavior; (3) stronger preferential flow with a shorterrelative 5% arrival time occurred in vertical direction, where higher Ks valueswere observed; (4) phosphate release was observed from drained peat only. Bothanisotropy and soil heterogeneity influenced phosphate leaching. The soil corewith the strongest preferential flow released the largest amount of phosphate. Weconclude that the anisotropic properties of peat soils should be considered in peatlandhydrology and biogeochemical models as well as in peatland restoration projects.
- Subjects
PEAT soils; PHOSPHATES; PEATLAND restoration; PEATLANDS; ANISOTROPY; HYDRAULIC conductivity; HISTOSOLS
- Publication
Geophysical Research Abstracts, 2019, Vol 21, p1
- ISSN
1029-7006
- Publication type
Article