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| Hauptseite > Publikationsdatenbank > Sediment transport outweighs flow resumption mode as a driver of river carbon and nitrogen dynamics in a temporary stream |
| Hauptseite > Publikationsdatenbank > Sediment transport outweighs flow resumption mode as a driver of river carbon and nitrogen dynamics in a temporary stream |
| Journal Article | FZJ-2026-03542 |
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2026
Wiley-Blackwell
Oxford [u.a.]
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Please use a persistent id in citations: doi:10.1002/lno.70459 doi:10.34734/FZJ-2026-03542
Abstract: Although transitions from dry-to-flowing conditions in non-perennial rivers are recognized as biogeochemical hot moments, the drivers modulating these hot moments remain poorly understood. We identify two main drivers of importance for biogeochemical processes during flow resumption: the dry-to-flow mode, referring to how flow is reestablished, and whether resumption leads to sediment transport. Using experimental flumes, we examined how instant and gradual surface flows (the latter preceded by 6-h inundation), with varying sediment transport rates, affect streambed biogeochemistry. Over 24 h, we measured carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) fluxes and porewater concentrations, and analyzed the temporal dynamics of CO2 fluxes and dissolved oxygen.Additionally, we added isotope-labeled nitrate to trace denitrification through changes in nitrogen gas isotope ratios (δ15N-N2) and determined the uptake and release rates of nitrate (NO3 ) and ammonium (NHþ4 ). We found that dry-to-flow mode, irrespective of sediment transport, influenced dissolved oxygen, CO2 fluxes, nutrient dynamics, and changes in δ15N-N2, but did not affect CH4 or N2O fluxes. Interestingly, both dry-to-flow modes produced nearly synchronized CO2 flux peaks upon water entry to the flumes, regardless of sediment transport rate. Yet, transport was positively associated with dissolved oxygen concentrations and net NO3 release and negatively related to changes in δ15N-N2, CH4, and N2O fluxes. Our findings highlight how the mode of flow resumption and sediment transport dynamics can shape biogeochemical hot moments in rivers and underscore the need to consider the characteristics of hydrological transitions when estimating non-perennial river contributions to global carbon and nitrogen budgets.
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