Articles | Volume 12, issue 6
https://doi.org/10.5194/bg-12-1941-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/bg-12-1941-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Research article
| 
24 Mar 2015
Research article |
| 24 Mar 2015
Riparian and in-stream controls on nutrient concentrations and fluxes in a headwater forested stream
S. Bernal
CORRESPONDING AUTHOR
Center for Advanced Studies of Blanes (CEAB-CSIC), Accés a la Cala Sant Francesc 14, 17300, Blanes, Girona, Spain
Departament d'Ecologia, Facultat de Biologia, Universitat de Barcelona, Av. Diagonal 643, 08028, Barcelona, Spain
A. Lupon
Departament d'Ecologia, Facultat de Biologia, Universitat de Barcelona, Av. Diagonal 643, 08028, Barcelona, Spain
M. Ribot
Center for Advanced Studies of Blanes (CEAB-CSIC), Accés a la Cala Sant Francesc 14, 17300, Blanes, Girona, Spain
F. Sabater
Departament d'Ecologia, Facultat de Biologia, Universitat de Barcelona, Av. Diagonal 643, 08028, Barcelona, Spain
E. Martí
Center for Advanced Studies of Blanes (CEAB-CSIC), Accés a la Cala Sant Francesc 14, 17300, Blanes, Girona, Spain
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Over 4.5 years, we studied 53 storms to assess stream metabolism’s resistance to change and resilience (recover capacity). Resistance was low, as storms easily disrupted metabolism, with energy consumption rising in larger events. Resilience decreased with storm size, prolonging recovery, but stabilized after 6 days. While storms temporarily boost activity, larger ones hinder recovery. Our findings highlight how changing storm patterns could alter stream health and their role in nutrient cycles.
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We studied a small stream located in a Mediterranean forest. Our goal was to understand how stream flow and the presence of riparian forests, which grow in flat banks near the stream, influence the availability of food for aquatic microorganisms. High flows were associated with higher amounts of food because rainfall episodes transfer it from the surrounding sources, particularly riparian forests, to the stream. Understanding how ecosystems work is essential to better manage natural resources.
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Lateral carbon fluxes from terrestrial to aquatic systems remain central uncertainties in determining ecosystem carbon balance. This work explores how temperature and hydrology control production and export of dissolved organic carbon (DOC) at the catchment scale. Results illustrate the asynchrony of DOC production, controlled by temperature, and export, governed by flow paths; concentration–discharge relationships are determined by the relative contribution of shallow versus groundwater flow.
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We used the PERSiST model to explore the role of riparian evapotranspiration (ET) in regulating streamflow in Mediterranean regions. Riparian ET was essential for understanding streamflow dynamics, especially in summer. Moreover, climate change simulations showed that the contribution of riparian ET to annual water budgets will increase in the future. We must include riparian zones in hydrological models in order to establish proper management strategies in water-limited regions.
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The influence of riparian evapotranspiration (ET) on stream hydrology and chemistry is poorly understood. We investigated temporal changes in riparian ET, stream discharge and nutrient chemistry along a Mediterranean catchment. Despite being a small component of annual water budgets (4.5 %), our results highlight that riparian ET drives stream and groundwater hydrology in Mediterranean catchments and, further, question the potential of the riparian zone as a natural filter of nitrogen loads.
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Over 4.5 years, we studied 53 storms to assess stream metabolism’s resistance to change and resilience (recover capacity). Resistance was low, as storms easily disrupted metabolism, with energy consumption rising in larger events. Resilience decreased with storm size, prolonging recovery, but stabilized after 6 days. While storms temporarily boost activity, larger ones hinder recovery. Our findings highlight how changing storm patterns could alter stream health and their role in nutrient cycles.
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We studied a small stream located in a Mediterranean forest. Our goal was to understand how stream flow and the presence of riparian forests, which grow in flat banks near the stream, influence the availability of food for aquatic microorganisms. High flows were associated with higher amounts of food because rainfall episodes transfer it from the surrounding sources, particularly riparian forests, to the stream. Understanding how ecosystems work is essential to better manage natural resources.
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Lateral carbon fluxes from terrestrial to aquatic systems remain central uncertainties in determining ecosystem carbon balance. This work explores how temperature and hydrology control production and export of dissolved organic carbon (DOC) at the catchment scale. Results illustrate the asynchrony of DOC production, controlled by temperature, and export, governed by flow paths; concentration–discharge relationships are determined by the relative contribution of shallow versus groundwater flow.
Anna Lupon, José L. J. Ledesma, and Susana Bernal
Hydrol. Earth Syst. Sci., 22, 4033–4045, https://doi.org/10.5194/hess-22-4033-2018, https://doi.org/10.5194/hess-22-4033-2018, 2018
Short summary
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We used the PERSiST model to explore the role of riparian evapotranspiration (ET) in regulating streamflow in Mediterranean regions. Riparian ET was essential for understanding streamflow dynamics, especially in summer. Moreover, climate change simulations showed that the contribution of riparian ET to annual water budgets will increase in the future. We must include riparian zones in hydrological models in order to establish proper management strategies in water-limited regions.
Susana Bernal, Anna Lupon, Núria Catalán, Sara Castelar, and Eugènia Martí
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The influence of riparian evapotranspiration (ET) on stream hydrology and chemistry is poorly understood. We investigated temporal changes in riparian ET, stream discharge and nutrient chemistry along a Mediterranean catchment. Despite being a small component of annual water budgets (4.5 %), our results highlight that riparian ET drives stream and groundwater hydrology in Mediterranean catchments and, further, question the potential of the riparian zone as a natural filter of nitrogen loads.
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Short summary
Terrestrial inputs are considered the major driver of longitudinal patterns of nutrient concentration. Yet we show that longitudinal trends result from hydrological mixing with terrestrial inputs and in-stream processes. We challenge the idea that nutrient concentrations decrease downstream when in-stream net uptake is high. Conversely, in-stream processes can strongly affect stream nutrient chemistry and fluxes even in the absence of consistent longitudinal trends in nutrient concentration.
Terrestrial inputs are considered the major driver of longitudinal patterns of nutrient...
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