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| Titel |
Environmental factors regulating soil organic matter chlorination |
| VerfasserIn |
Teresia Svensson, Malin Montelius, Henrik Reyier, Karolina Rietz, Susanne Karlsson, Cecilia Lindberg, Malin Andersson, Åsa Danielsson, David Bastviken |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250131259
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| Publikation (Nr.) |
 EGU/EGU2016-11647.pdf |
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| Zusammenfassung |
| Natural chlorination of organic matter is common in soils. Despite the widespread abundance
of soil chlorinated soil organic matter (SOM), frequently exceeding soil chloride
abundance in surface soils, and a common ability of microorganisms to produce
chlorinated SOM, we lack fundamental knowledge about dominating processes and
organisms responsible for the chlorination. To take one step towards resolving the
terrestrial chlorine (Cl) puzzle, this study aims to analyse how environmental factors
influence chlorination of SOM. Four factors were chosen for this study: soil moisture
(W), nitrogen (N), chloride (Cl) and organic matter quality (C). These factors are
all known to be important for soil processes. Laboratory incubations with 36Cl
as a Cl tracer were performed in a two soil incubation experiments. It was found
that addition of chloride and nitrogen seem to hamper the chlorination. For the
C treatment, on the other hand, the results show that chlorination is enhanced by
increased availability of labile organic matter (glucose and maltose). Even higher
chlorination was observed when nitrogen and water were added in combination with labile
organic matter. The effect that more labile organic matter strongly stimulated the
chlorination rates was confirmed by the second separate experiment. These results
indicate that chlorination was not primarily a way to cut refractory organic matter
into digestible molecules, representing one previous hypothesis, but is related with
microbial metabolism in other ways that will be further discussed in our presentation. |
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