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When water returns: Drying history shapes respiration and nutrients release of intermittent river sediment by José Schreckinger; Michael Mutz; Clara Mendoza-Lera is a Environmental Science article available to read on EtoBox.

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Climate change and anthropogenic water demand have increased the frequency and duration of drying periods across rivers and streams worldwide. However, the biogeochemical processes during the water return in desiccated riverbeds are still unclear. Drying is a complex and diverse process and biogeochemical implications upon flow resumption may depend on attributes of the drying and river sediment characteristics (i.e., organic matter content [OM]). In order to understand the effect of drying duration and intensity on the biogeochemical dynamics following flow resumption, we exposed OM- and non-enriched river sediment from an intermittent river section to three different drying intensities (low: shade and rain; moderate: no shade and rain; high: no shade and no rain), each for three drying durations (10, 30 and 90 days). We determined the sediment-associated microbial respiration and dissolved organic carbon (DOC), ammonium‐nitrogen (NH-N), nitrate‐nitrogen (NO-N) and soluble reactive phosphorus (SRP) net release/retention rates of the nine drying treatments in flow-through microcosms over four days past flow resumption. Under the most intense and prolonged drying, non-enriched sedim

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Author

José Schreckinger; Michael Mutz; Clara Mendoza-Lera

Publisher

Elsevier BV

Published

2022

Language

EN

Field

Environmental Science (Physical Sciences)