4.5 Article

Linking transport pathways and phosphorus distribution in a loamy soil: a case study from a North-Eastern German Stagnosol

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SPRINGER
DOI: 10.1007/s10661-023-11465-6

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Dye tracer experiment; Germany; Macropore flow; Mecklenburg-Vorpommern; Non-uniform flow; Preferential flow; Stained flow path width

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Heterogeneous flow pathways through the soil determine the transport of dissolved and particle-bound nutritional elements like phosphorus (P) to ground and surface waters. This study aimed to understand the spatial patterns of P in agriculturally used soils and the mechanisms causing P accumulation and depletion at the centimeter scale. Dye tracer experiments using Brilliant Blue were conducted on a loamy Stagnosol in North-Eastern-Germany. The results showed that P tends to accumulate along flow pathways in the topsoil, while it is depleted from the macroporous flow domains in the subsoil.
Heterogeneous flow pathways through the soil determine the transport of dissolved and particle-bound nutritional elements like phosphorus (P) to ground and surface waters. This study was designed to understand the spatial patterns of P in agriculturally used soils and the mechanisms causing P accumulation and depletion at the centimetre scale. We conducted dye tracer experiments using Brilliant Blue on a loamy Stagnosol in North-Eastern-Germany. The plant-available P was analysed using double lactate extraction (DL-P). The plant-available P content of the topsoil was significantly higher than that of the subsoil in all three replicates (p < 0.001). The topsoil's stained areas showed significantly higher P contents than unstained areas (p < 0.05), while the opposite was found for the subsoil. The P content varied enormously across all observed soil profiles (4 to 112 mg P kg(-1) soil) and different categories of flow patterns (matrix flow, flow fingers, macropore flow, and no visible transport pathways). The P contents of these transport pathways differed significantly and followed the order: P-matrix flow > P-finger flow > P-no visible transport pathways > P-macropore flow. We conclude that P tends to accumulate along flow pathways in the topsoil in the observed fertilized and tilled mineral soil. In contrast, in the subsoil at a generally lower P level, P is depleted from the prominent macroporous flow domains.

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