How iron oxidation can direct the fate of organic matter and iron mineral composition in redox dynamic soils

Vortragender: Prof. Dr. Aaron Thompson, Department of Crop and Soil Sciences, University of Georgia, USA (Homepage)
Do. 02.12.2021 (12:15-13:45)

Fe(II) oxidation by O2 is an important process generating Fe (oxyhydr)oxides, which play sorptive, structural and electron-transfer roles in soils. These roles in turn can have strong implications for the fate of organic matter, particularly in redox-dynamic soils in which Fe oxidation events are quite common. Leveraging a variety of different experiments using surface and subsurface soils from the Calhoun and Luquillo Experimental Forests (formerly Critical Zone Observatories) we explore how the rate of Fe(II) oxidation (modulated by O2 concentration), the length of Fe(II) oxidizing conditions (i.e., amount of oxic exposure), and the presence of various surfaces and organic complexing agents during Fe oxidation have implications for organic matter mineralization and composition as well as for the evolution of Fe minerals in soils. Collectively, our data suggests that while Fe reduction is often a driver of elemental release and organic matter transformation, this process is strongly influenced by the characteristics of prior Fe(II) oxidation events.

*** invited by Prof. Stefan Peiffer, Hydrology

Export as iCal: Export iCal
Aktuelle Termine

Do. 09.12.2021
Understanding mycorrhizal functions across scales
Do. 16.12.2021
Abschiedsvorlesung: Wozu lassen sich Modelle von Ökosystemen verwenden?
Do. 13.01.2022
Allergens in the air we breathe: relevance, avoidance and effect of climate change
Digitale Vortragsreihe KlimaDiskurse (bayklif):
Di. 14.12.2021
Tropisches Eis? Die Macht der Kunst im Kampf um 1.5°
Di. 11.01.2022
Wie gelingt die Energiewende? Soziale Innovationen als Motor der Transformation
Wetter Versuchsflächen
Luftdruck (356m): 966.7 hPa
Lufttemperatur: -1.6 °C
Niederschlag: 0.0 mm/24h
Sonnenschein: <1 h/d
Wind (Höhe 17m): 2.9 km/h
Wind (Max.): 5.0 km/h
Windrichtung: SO

Globalstrahlung: -1 W/m²
Lufttemperatur: -3.2 °C
Niederschlag: 0.0 mm/24h
Sonnenschein: <1 h/d
Wind (Höhe 32m): 0.0 km/h

Diese Webseite verwendet Cookies. weitere Informationen