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Trapped between drowning and desiccation: riverine plants under hydropeaking
CERIS, Civil Engineering Research and Innovation for Sustainability, Instituto Superior Técnico, University of Lisbon, Av. Rovisco Pais, Lisboa, Portugal.
Natural Resources Department, Universidad Politécnica de Madrid (UPM), Calle José Antonio Novais, 10, Madrid, Spain.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och geovetenskap.ORCID-id: 0000-0001-6187-499x
CERIS, Civil Engineering Research and Innovation for Sustainability, Instituto Superior Técnico, University of Lisbon, Av. Rovisco Pais, Lisboa, Portugal.
2022 (Engelska)Ingår i: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 829, artikel-id 154451Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Hydropeaking is part of hydropower production. The discontinuous release of turbined water during hydropeaking generates sudden rise and falls of the water levels, as well as extended droughts. These artificial flow fluctuations impose challenging growing conditions for riverine vegetation. In order to identify vulnerable/resistant plant species to hydropeaking and to evaluate the impact of contrasting hydropeaking scenarios (simplified (i.e., sudden deep floods, frequent soil saturation and drought) and real-life, power plant-induced scenarios), we measured germination, survival, and morphological and physiological attributes of a selection of 14 plant species commonly found along riparian areas. Species were subject to different hydropeaking scenarios during three months (vegetative period) in the field and in a greenhouse. Half of the species performed worse under hydropeaking in comparison to the control (e.g., less germination and biomass, lower growth rates, reduced stem and root length, physiological stress) but none of the tested hydropeaking scenarios was clearly more disruptive than others. Betula pubescens, Alnus incana and Filipendula ulmifolia showed the largest vulnerability to hydropeaking, while other species (e.g., Carex acuta) were resistant to it. Both in the field and in the greenhouse, plants in perturbed scenarios accumulated more 13C than in the control scenario indicating limited capacity to perform 13C isotope discrimination and evidencing plant physiological stress. The highest 13C abundances were found under drought or flooding conditions in the greenhouse, and under the highest hydropeaking intensities in the field (e.g., Betula pubescens). Our results suggest that any hydropeaking scheme can be equally detrimental in terms of plant performance. Hydropeaking schemes that combine periods of severe drought with long and frequent flooding episodes may create a hostile environment for riverine species. Further research on "hydropeaking-tolerant" plant traits is key to draw the boundaries beyond which riverine species can germinate, grow and complete their life cycle under hydropeaking.

Ort, förlag, år, upplaga, sidor
Elsevier, 2022. Vol. 829, artikel-id 154451
Nyckelord [en]
Drought, Flooding, Hydropeaking, Plant morphology, Riverine vegetation, Stoichiometry
Nationell ämneskategori
Ekologi Botanik
Identifikatorer
URN: urn:nbn:se:umu:diva-193687DOI: 10.1016/j.scitotenv.2022.154451ISI: 000793203100013PubMedID: 35278540Scopus ID: 2-s2.0-85127213424OAI: oai:DiVA.org:umu-193687DiVA, id: diva2:1655802
Forskningsfinansiär
Vetenskapsrådet, 2019-05099Tillgänglig från: 2022-05-03 Skapad: 2022-05-03 Senast uppdaterad: 2023-09-05Bibliografiskt granskad

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Sarneel, Judith M.

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Institutionen för ekologi, miljö och geovetenskap
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Science of the Total Environment
EkologiBotanik

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