Mona Mossadeghi Björklund
Sammanfattning av doktoranduppgiften
Effects of compaction on the morphology and function of the soil pore system and on soil mechanical properties
Soil compaction by vehicular traffic can lead to profound changes in soil mechanical properties and the soil pore system and correspondingly influence preferential water flow and movement of associated chemicals to the groundwater in arable lands. Compaction not only reduces pore volume, but also modifies the pore geometry (i.e. pore morphology and connectivity). Hence, soil compaction modifies soil structure and affects a range of important ecological functions. Compaction may also induce preferential flow in any remaining macropores or those that regenerate after compaction, which may facilitate transport of otherwise immobile pollutants such as phosphorus and pesticides to receiving water bodies. Many studies have investigated the effects of agricultural field traffic on soil stresses and strains in the subsoil, as well as soil compaction effects on crop yield. However, the effects of compaction on soil pore functioning and transport processes have been little studied and are still poorly understood. During this project we will evaluate the effect of compaction on morphology and function of soil pore system, transport processes and mechanical properties of the soil. The work is generally part of the Nordic Poseidon Project.