P-Campus-Ringvorlesung am 01.06.23

Am 1. Juni findet der zweite Vortrag der P-Campus-Ringvorlesung 2023 statt. Dr. Nina Siebers vom Forschungszentrum Jülich spricht online via Webex zum Thema "Turnover and transport of phosphorus in soil aggregates – From macroaggregates to nanoparticles".
Die Vorlesung beginnt um 15:00 Uhr und ist kostenfrei.

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The availability and cycling of phosphorus in soils are significantly influenced by soil aggregates, which range in their size from large macroaggregates to smallest nanoparticles. The assembly of aggregates of different sizes creates a 3D structure with interconnected voids and pores of different shapes, sizes, and geometries. This network of pores acts as a dynamic biogeochemical interface that facilitates the movement of gases and water within the soil. The architecture and stability of soil aggregates, and thus their ability to provide niches for water storage and microbial nutrient metabolism, depend largely on the spatial arrangement of the individual structural units, their elemental composition, and the distribution of metal oxides and organic matter. In particular, soil colloids (particles smaller than 1000 nanometers) are increasingly recognized as important nutrient carriers in ecosystems because of their unique composition and large specific surface area. They are highly mobile in soils, and the transport of elements facilitated by colloids is closely linked to water movement in the soil. As a result, loss of P and other nutrients through particulate transport has become a growing concern. In this talk, we will take a closer look at the composition and stability of soil aggregates and their controls on phosphorus turnover by organisms. We will discuss the impact of land use change on the phosphorus turnover and examine analytical techniques for characterizing nanoparticles and colloids in soil, including their size and elemental composition. By means of a case study, we specifically examine subsurface transport of particulate phosphorus to adjacent surface waters. By understanding the complex interactions between soil aggregate architecture, elemental composition, and biogeochemical processes, we can control nutrient cycling in ecosystems and mitigate the loss of phosphorus and other nutrients through particulate transport.


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