Weihrauch, Christoph ; Weber, Collin Joel (2021)
The enrichment of phosphorus in floodplain subsoils – A case study from the Antrift catchment (Hesse, Germany).
In: Geoderma, 385
doi: 10.1016/j.geoderma.2020.114853
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

Deep phosphorus (P) stocks are considered a potential driver of freshwater eutrophication because they may temporarily transfer P to the groundwater and adjacent surface waters. The build-up of deep P stocks is not yet understood. Hence, their contribution to water quality impairment cannot be mitigated effectively. We conducted a field study with soil sampling and P fractionation in the laboratory to assess five scenarios how deep P stocks might develop. Our data show that deep P stocks result neither from primary bedrock/substratum features (geogenic loading) nor from primary pedological characteristics. Instead, they seem to originate from secondary processes, i.e., underground P translocation. The build-up of deep P stocks is indicated to be specifically driven by downslope translocation of P in the interflow, which leads to P enrichment of toeslope subsoils. Moreover, under low flow conditions, floodplain subsoils might become enriched with P by increased sorption of P from groundwater which is hydrologically connected with surface waters with high P concentrations. Gleysol groundwater dynamics did not prove to be a systematic driver of the build-up of deep P stocks. However, on certain sites, intensive groundwater dynamics might foster vertical P translocation and could hence contribute to deep P enrichment. Thus, enrichment of phosphorus in floodplain subsoils probably results interactively from several subsurface P translocation processes which might be weighted site-specifically.

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