Please note that this session was withdrawn and is no longer available in the respective programme. This withdrawal might have been the result of a merge with another session.


Soil-forming processes from microscopic to landscape scale and the role of dust input on pedogenesis

Soil formation can be observed at various scales. For instance, at a centimetre scale, soil structure formation creates spatial patterns, which may result in contrasting conditions for weathering, redox processes and microbial activity within a few µm to mm. Soil formation at a horizon to pedon scale is usually characterized by the transition from one soil type to another, as investigated e.g. in soil chronosequences studies. Finally, soil formation at landscape scale involves also lateral processes such as erosion-sedimentation, or transport of solutes that may lead to predominantly depleted upslope soils and predominantly enriched footslope soils. Processes that take place at one scale may with time lead to soil changes at another scale.
These concepts are complicated by the fact that many soils do not simply form from local weathering products, but also have some aeolian or lateral (colluvial) contribution. This is the case especially for soils in arid and Mediterranean climates, mountain regions, areas of active volcanism, and coastal landscapes. Furthermore, many soils of temperate regions developed from slope deposits enriched in windblown silt. These deposits are usually related to periglacial conditions during the last glacial.

In this session, abstracts about the following topics are welcome:
- aeolian inputs into soils, implications for soil genesis and ecologically relevant soil properties
- soil processes and erosion proceeding at different scales and interactions across scales (both spatial and temporal)
- methods to assess soil formation, and to determine soil production and denudation
- geochemical fluxes related to soils and landscapes

Co-organized by
Convener: Daniela Sauer | Co-convener: Markus Egli