Seed retention by pioneer trees enhances plant diversity resilience on gravel bars: Observations from the river Allier, France

Corenblit, Dov Jean-François; Vidal, Vincent; Cabanis, Manon; Steiger, Johannes; Garófano‐Gómez, Virginia; Garreau, Alexandre; Hortobágyi, Borbála; Otto, Thierry; Roussel, Erwan; Voldoire, Olivier

doi:10.1016/j.advwatres.2016.02.015

Cited by 27 publications

(26 citation statements)

References 52 publications

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“…The climatic patterns of the Austrian site are more benign for seedlings establishment; however, on the basis of evidence (Geerling et al, ), this site should be more dynamic and the limiting factor may be the occurrence of large floods able to uproot these immature plants (Camporeale et al, ). In this context, the most suitable habitats are typically in the lee side of existing woody vegetation patches because those areas have been noted to provide shelter and to facilitate sedimentation (Corenblit et al, ), which eventually favour moisture retention and plant development (Bejarano, Marchamalo, et al, ).…”

Section: Discussionmentioning

confidence: 99%

Exploring the key drivers of riparian woodland successional pathways across three European river reaches

et al. 2017

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International audienceClimate change and river regulation are negatively impacting riparian vegetation. To evaluate these impacts, process‐based models are preferred over data‐driven approaches. However, they require extensive knowledge about ecohydrological processes. To facilitate the implementation of such process‐based models, the key drivers of riparian woodland successional pathways across three river reaches, in Austria, Portugal, and Spain, were explored, employing two complementary approaches. The principal component analyses highlighted the importance of the physical gradients determining the placement of the succession phases within the riparian and floodplain zones. The generalized additive models revealed that the initial and pioneer succession phases, characteristic of the colonization stage, appeared in areas highly morphodynamic, close in height and distance to the water table, and with coarse substrate, whereas elder phases within the transitional and mature stages showed incremental differences, occupying less dynamic areas with finer substrate. The Austrian site fitted well the current successional theory (elder phases appearing sequentially further up and distant), but at the Portuguese site, the tolerance of the riparian species to drought and flash flood events governed their placement. Finally, at the Spanish site, the patchy distribution of the elder phases was the remnants of formative events that reshaped the river channel. These results highlight the complex relationships between flow regime, channel morphology, and riparian vegetation. The use of succession phases, which rely on the sequential evolution of riparian vegetation as a response to different drivers, may be potentially better reproducible, within numerical process‐based models, and transferable to other geographical regions

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Section: Discussionmentioning

confidence: 99%

Exploring the key drivers of riparian woodland successional pathways across three European river reaches

et al. 2017

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“…However, sediment regime and overbank sedimentation dynamics also play a major role in modulating fluvial landforms and structuring ecological and biogeochemical processes within riverine ecosystems (Steiger, Gurnell, & Corenblit, ; Wohl et al, ). As pointed out by Steiger, Tabacchi, Dufour, Corenblit, and Peiry (), overbank sedimentation processes, rates and patterns are controlled by many different factors from basin (e.g., sediment production, Latrubesse & Restrepo, ) to local scales (e.g., formation of a sediment tail, i.e., an obstacle mark, in the lee of a floodplain tree; Rodrigues et al, ; Corenblit et al, ). Therefore, the spatial variability of floodplain sedimentation tends to be inherently complex in terms of quantity and quality (e.g., texture, nutrient and contaminant content; Walling & Bradley, ; Asselman & Middelkoop, ; Steiger & Gurnell, ; Aalto, Wesley, & William, ; Schwendel, Nicholas, Aalto, Sambrook Smith, & Buckley, ; Omengo, Alleman, Geeraert, Bouillon, & Govers, ).…”

Section: Introductionmentioning

confidence: 99%

Multi‐annual contemporary flood event overbank sedimentation within the vegetated lower Orinoco floodplain, Venezuela

Rodríguez

Steiger

Rosales

et al. 2019

River Research & Apps

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Multi‐annual contemporary flood event overbank sedimentation rates were quantified on the World's third largest river in terms of discharge, the tropical lower Orinoco. We discuss the role of variables at the basin and reach scales that contributed to the complexity of spatio‐temporal overbank sediment deposition patterns. Monitored in situ plots were characterized by distance to the main channel, hydroperiod, different geomorphological units, and vegetation cover. Flood event sedimentation rates showed a high spatial variability ranging from the absence of sediment deposition up to 225.46 kg m‐2 yr‐1. Banks and levees received relatively high amounts of sediment (39.6 kg m‐2 yr‐1), whereas observed mean sedimentation rates on the more distant floodplain and backswamps tended to be lower (17.7 kg m‐2 yr‐1). Significant differences in sedimentation rates were observed in two major vegetation types: dense herbaceous and shrubby vegetation (42.2 kg m‐2 yr‐1) and floodplain forest (12.7 kg m‐2 yr‐1). However, overbank sedimentation patterns also reflected imbricated hydrosedimentary and biogeomorphological vegetation feedbacks that co‐construct fluvial landforms. The incidence of an El Niño–Southern Oscillation–La Niña episode during the study period on sediment availability and floodplain sedimentation suggests that within whitewater rivers, where suspended sediment concentrations are naturally high, hydrological connectivity seems to be more important for floodplain sedimentation than variations in suspended sediment concentrations. These results may provide a good basis for future biogeomorphological investigation projects using complementary methodologies, in order to better anticipate global change and fluctuations in the occurrence, strength or duration of El Niño–La Niña episodes in the tropical zone and their consequences for flood discharge and sediment dynamics during channel–floodplain exchanges.

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“…; Corenblit et al. ) but this is not directly incorporated into models as the processes have a much smaller spatial scale than typical grid resolutions allow to represent. The effect of dynamic vegetation compared to the more simplistic ‘static’ vegetation was a much more dynamic and more patchy pattern of vegetation and morphology (van Oorschot et al.…”

Section: Introductionmentioning

confidence: 99%

Living landscapes: Muddy and vegetated floodplain effects on fluvial pattern in an incised river

Kleinhans

Vries

Braat

et al. 2018

Earth Surf Processes Landf

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Cohesive floodplain sediment and vegetation are both thought to cause meandering river patterns. Our aims are to compare the isolated and combined effects of mud and vegetation on river planform and morphodynamics in the setting of intermediate‐sized valley rivers. We use a numerical model for century‐scale simulation of flow, sediment transport and morphology coupled with riparian vegetation settlement, growth and mortality as functions of species traits on which flow resistance depends. Mud fluxes were predicted by excess shear stress relations in combination with the active layer formulation. We found that valley‐flooding water levels increase with vegetation density, causing a higher braiding intensity rather than meandering tendency. The shear stress during floods carves channels through the muddy floodplain surface. Higher mud concentration, on the other hand, increases floodplain aggradation, reduces the overbank flow frequency and ultimately causes formation of a single‐thread channel. Vegetation causes mud to deposit closer to the river channel as a levee, showing that mud sedimentation and vegetation settling mutually enhance floodplain formation. However, mud and vegetation counteract in two ways. First, vegetation enhances floodplain accretion, which ultimately increases plant desiccation for high mud concentrations. Second, vegetation increases the tendency of periodic chute cutoffs in valleys. The chute cutoffs locally reset the landscape and create new windows of opportunity for the vegetation. Surprisingly, in systems with a high mud concentration this causes hysteretic loops of vegetation cover and delayed mud deposition. Ramifications for the interpretation of Palaeozoic fluvial facies are that even rootless vegetation, capturing cohesive mud closer to the river channel to form thicker floodplain on the point bar, can enhance the tendency to meander and, under high mud supply, form stable channels. However, meandering is more unlikely in narrower valley rivers with higher vegetation density. © 2018 John Wiley & Sons, Ltd.

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Seed retention by pioneer trees enhances plant diversity resilience on gravel bars: Observations from the river Allier, France

Cited by 27 publications

References 52 publications

Exploring the key drivers of riparian woodland successional pathways across three European river reaches

Exploring the key drivers of riparian woodland successional pathways across three European river reaches

Multi‐annual contemporary flood event overbank sedimentation within the vegetated lower Orinoco floodplain, Venezuela

Living landscapes: Muddy and vegetated floodplain effects on fluvial pattern in an incised river

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