Iron sulfide oxidation in drained coastal lowland soils liberates acidity, Fe and SO4, and leads to the accumulation of secondary Fe(III) minerals, such as schwertmannite and jarosite. In this seminar, I will describe recent advances in understanding iron, sulfur and arsenic biogeochemistry in acid-sulfate wetland soils. In particular, I will discuss new discoveries from the world's first landscape-scale reflooding of a tidal acid-sulfate wetland. In addition to field observations, the presentation will also include a discussion of new findings from controlled laboratory-based experiments examining sorption-desorption of arsenic and transformations of iron-sulfur in model wetland systems. This will be linked to field observations on the formation and transformation of iron-sulfide minerals, including greigite and pyrite, and the impact on in-situ arsenic behaviour.
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A new experiment to unravel the Impact of Biodiversity and Climate Variability on the functioning of grasslands
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