Publication Details

Category Text Publication
Reference Category Journals
DOI 10.1016/j.earscirev.2021.103724
Licence creative commons licence
Title (Primary) Towards an improved understanding of biogeochemical processes across surface-groundwater interactions in intermittent rivers and ephemeral streams
Author Gómez-Gener, L.; Siebers, A.R.; Arce, M.I.; Arnon, S.; Bernal, S.; Bolpagni, R.; Datry, T.; Gionchetta, G.; Grossart, H.-P.; Mendoza-Lera, C.; Pohl, V.; Risse-Buhl, U.; Shumilova, O.; Tzoraki, O.; von Schiller, D.; Weigand, A.; Weigelhofer, G.; Zak, D.; Zoppini, A.
Source Titel Earth-Science Reviews
Year 2021
Department FLOEK
Volume 220
Page From art. 103724
Language englisch
Topic T5 Future Landscapes
Keywords Intermittency; Non-perennial; Watercourses; Stream network; Ecosystem ecology; Carbon; Nitrogen; Phosphorus
Abstract Surface-groundwater interactions in intermittent rivers and ephemeral streams (IRES), waterways which do not flow year-round, are spatially and temporally dynamic because of alternations between flowing, non-flowing and dry hydrological states. Interactions between surface and groundwater often create mixing zones with distinct redox gradients, potentially driving high rates of carbon and nutrient cycling. Yet a complete understanding of how underlying biogeochemical processes across surface-groundwater flowpaths in IRES differ among various hydrological states remains elusive. Here, we present a conceptual framework relating spatial and temporal hydrological variability in surface water-groundwater interactions to biogeochemical processing hotspots in IRES. We combine a review of theIRES biogeochemistry literature with concepts of IRES hydrogeomorphology to: (i) outline common distinctions among hydrological states in IRES; (ii) use these distinctions, together with considerations of carbon, nitrogen, and phosphorus cycles within IRES, to predict the relative potential for biogeochemical processing across different reach-scale processing zones (flowing water, fragmented pools, hyporheic zones, groundwater, and emerged sediments); and (iii) explore the potential spatial and temporal variability of carbon and nutrient biogeochemical processing across entire IRES networks. Our approach estimates the greatest reach-scale potential for biogeochemical processing when IRES reaches are fragmented into isolated surface water pools, and highlights the potential of relatively understudied processing zones, such as emerged sediments. Furthermore, biogeochemical processing in fluvial networks dominated by IRES is likely more temporally than spatially variable. We conclude that biogeochemical research in IRES would benefit from focusing on interactions between different nutrient cycles, surface-groundwater interactions in non-flowing states, and consideration of fluvial network architecture. Our conceptual framework outlines opportunities to advance studies and expand understanding of biogeochemistry in IRES.
Persistent UFZ Identifier
Gómez-Gener, L., Siebers, A.R., Arce, M.I., Arnon, S., Bernal, S., Bolpagni, R., Datry, T., Gionchetta, G., Grossart, H.-P., Mendoza-Lera, C., Pohl, V., Risse-Buhl, U., Shumilova, O., Tzoraki, O., von Schiller, D., Weigand, A., Weigelhofer, G., Zak, D., Zoppini, A. (2021):
Towards an improved understanding of biogeochemical processes across surface-groundwater interactions in intermittent rivers and ephemeral streams
Earth-Sci. Rev. 220 , art. 103724 10.1016/j.earscirev.2021.103724