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              <p>The intense biogeochemical activity in sediment, submerged soil or wetlands is often characterized by steep gradients of various physical and chemical parameters over submillimeter distances. In aquatic environments, mineralization of organic carbon induces strong changes in redox potential and the lability of several solutes in sediment. Moreover, animal-induced sediment reworking and bioirrigation as well as exudates from seagrass below-ground biomass can play a major role for carbon mineralization in marine sediments e.g. by affecting the oxygenation and distribution of labile carbon in deeper sediment layers and by inducing spatial and temporal heterogeneity in terms of redox conditions. A precise mapping of chemical gradients and their spatio-temporal dynamics in sediments is thus essential for understanding links between sediment biogeochemistry and marine organisms inhabiting/colonizing such sediments. In this context, we developed new multi-parameter chemical imaging techniques by combining luminescence-based optical sensor foils (planar optodes) with 2D-diffusional equilibrium in thin-film (DET) hydrogels enabling simultaneous sensing of pO2, dissolved iron, phosphate, nitrite/nitrate, sulfide, ammonium, manganese or pH.A first application was used in Zostera marina meadow to better understand biogeochemical interactions between the seagrass rhizosphere and the surrounding sediment. Nitrate/ nitrite, dissolved iron, oxygen and pH were analyzed in parallel in a rhizobox system showing clear codistributions in front of root systems.</p>
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