Die Entwicklung einer hierarchischen Bodenstruktur unter sich ändernden Permafrostbedingungen und ihre Bedeutung für die Kohlenstoffspeicherung in Böden der hohen Breiten auf verschiedenen räumlichen Skalenebenen

• Antragstellerinnen / Antragsteller: Dr. Leopold Sauheitl; Privatdozentin Dr. Carola Winkelmann, seit 11/2015
• Fachliche Zuordnung: Bodenwissenschaften
• Förderung: Förderung von 2012 bis 2017
• Projektkennung: Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 229950541

Most soils develop distinct soil architecture during pedogenesis and soil organic carbon (SOC) is sequestered within a hierarchical system of mineral-organic associations and aggregates. Permafrost soils store large amounts of carbon due to their permanently frozen subsoil and a lack of oxygen in the active layer, but they lack complex soil structure. With permafrost thaw more oxidative conditions and increasing soil temperature presumably enhance the build-up of more complex units of soil architecture and may counterbalance, at least partly, SOC mineralization. We aim to explore the development of mineral-organic associations and aggregates under different permafrost impact with respect to SOC stabilization. This information will be linked to environmental control factors relevant for SOC turnover at the pedon and stand scale to bridge processes occurring at the aggregate scale to larger spatial dimensions. We will combine in situ spectroscopic techniques with fractionation approaches and identify mechanisms relevant for SOC turnover at different scales by multivariate statistics and variogram analyses. From this we expect a deeper knowledge about soil architecture formation in the transition of permafrost soils to terrestrial soils and a scale-spanning mechanistic understanding of SOC cycling in permafrost regions.

• DFG-Verfahren: Sachbeihilfen
• Ehemalige Antragstellerin: Professorin Dr. Sandra Spielvogel, bis 11/2015