Unraveling mechanisms of soil carbon sequestration: organic matter-mineral interactions
Dissolved organic matter (DOM) plays an influential role in terrestrial and aquatic ecosystems. DOM is made of molecularly dispersed compounds and suspended objects with a size below 0.2 μm. The interaction between minerals and DOM leads to the formation of organic matter-mineral colloids. Recently, the colloidal fraction has been proposed to play a central role in the stability of organic matter towards microbial decomposition. Yet, very little is known about their colloidal properties. The aims of this proposal are: (i) Investigate DOM with SANS to obtain size and shape of the aggregates extracted from forest soil, and also obtain chemical information from contrast variation. (ii) Investigate DOM-mineral interactions by adding a known amount of ferrihydrite (Fe2O3x0.5H2O) and observe its effect on aggregate structures. We will primarily focus on ferrihydrite since iron plays a key role in oxidative decomposition of organic matter; Here we will explore contrast variation to highlight the scattering from DOM and mineral, individually. The results will allow us to characterize DOM and its interaction with relevant mineral particles.
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GENTILE Luigi; ANDERSSON Erika; MEKLESH Viktoriia; OLSSON Ulf; PERSSON Per; SCHWEINS Ralf; TORNQUIST Elin and TUNLID Anders. (2019). Unraveling mechanisms of soil carbon sequestration: organic matter-mineral interactions. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-10-1590
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