2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/22/2019 | 9:00 AM - 9:15 AM | DO ATTRIBUTES OF DRYING MATTER? SHORT-TERM RECOVERY OF SEDIMENT METABOLISM FROM VARIOUS DRYING | 151 G
DO ATTRIBUTES OF DRYING MATTER? SHORT-TERM RECOVERY OF SEDIMENT METABOLISM FROM VARIOUS DRYING
Little is known about the effect of flow intermittence on temperate rivers that experience more infrequent and less intense drying than those in arid zones. We apply concepts from soil rewetting to assess the significance of drying attributes on the short-term recovery of sediment metabolism upon flow resumption. During summer 2018, in 56 outdoor mesocosms, we exposed sandy sediments from the banks of a temperate river (Spree river, Germany); half of the mesocosms were enriched with local allochthonous organic matter (OM). We simulated 9 drying scenarios differing in attributes: duration (10, 30 and 90 days) and intensity: (no shade + no rain) > (no shade + rain) > (shade + rain). At the end of each duration and for each intensity, flow resumption was simulated perfusing the sediment with river water. Drying attributes and OM modulated the short-term recovery. For 10- and 30-days duration, regardless of OM and intensity, an immediate response was observed, while 90-days and intense drying with low OM resulted in a lagged short-term recovery. Our results suggest that, as observed in soils under rewetting, the metabolism of riverbed sediments is resilient depending on drying attributes.
- Intermittency
- Disturbance
- Carbon
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Presenters/Authors
Jose Schreckinger
(), Brandenburg University of Technology Cottbus-Senftenberg, jischreck88@gmail.com;
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Clara Mendoza-Lera
(), iES, University of Koblenz-Landau (Germany), clara.mendozalera@gmail.com;
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Michael Mutz
(), Department of Freshwater Conservation, BTU-Cottbus Senftenberg, m.mutz@b-tu.de;
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