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- W4220802893 abstract "Abstract Isoetids are slow growing ecosystem-engineers that maintain an oligotrophic environment through high radial oxygen losses (ROL) from their roots, which could potentially reduce methane (CH 4 ) emission by promoting CH 4 oxidation. Isoetid vegetations have declined in many European countries as an effect of eutrophication and inorganic carbon enrichment. To assess the effect of sudden disappearance of isoetids on biogeochemical carbon and nutrient cycling in organically rich sediments, we set up a greenhouse experiment. Intact vegetated sediment patches with Lobelia dortmanna and Litorella uniflora were collected from ten boreal Norwegian softwater lakes. For half of the patches, isoetids were manually removed. We determined the effect of removal on sediment redox potential, nitrogen (N), phosphorus (P), inorganic carbon availability and CH 4 emission. In addition, germination success of L. dortmanna seeds was tested on the sediments where isoetids were removed. The absence of ROL after isoetid removal led to a drop in sediment redox potential, resulting in anaerobic breakdown of organic matter using alternative electron acceptors, especially iron oxides. Consequently, increased pore water concentrations of ammonium (NH 4 + ), P and CH 4 were observed in sediments where isoetids had been removed compared to the isoetid vegetated sediments. Moreover, over 60 times higher emission of CH 4 was observed from the sediments where isoetids had been removed. On the highly reduced sediments, the germination of L. dortmanna was hampered. When isoetids are unable to recolonize after disturbance events, it is expected that the absence of ROL eventually results in a longterm inrease in lake productivity and CH 4 emission." @default.
- W4220802893 created "2022-04-03" @default.
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- W4220802893 date "2022-03-24" @default.
- W4220802893 modified "2023-09-27" @default.
- W4220802893 title "Isoetid mediated radial oxygen loss prevents iron reduction and the related mobilisation of ammonium and methane: an experimental approach." @default.
- W4220802893 doi "https://doi.org/10.21203/rs.3.rs-1474071/v1" @default.
- W4220802893 hasPublicationYear "2022" @default.
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