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Open AccessArticle

Functional Diversity Effects of Vegetation on Runoff to Design Herbaceous Hedges for Sediment Retention

1
AGHYLE, UP 2018.C101, SFR Condorcet FR CNRS 3417, UniLaSalle, 60026 Beauvais, France
2
AREAS, 76460 St Valéry en Caux, France
*
Author to whom correspondence should be addressed.
Diversity 2020, 12(4), 131; https://doi.org/10.3390/d12040131
Received: 12 February 2020 / Revised: 10 March 2020 / Accepted: 27 March 2020 / Published: 31 March 2020
(This article belongs to the Special Issue Plant-Soil Interactions)
Background: Functional diversity effects on ecosystem processes, like on soil erosion, are not fully understood. Runoff and soil erosion in agricultural landscapes are reduced by the hydraulic roughness (HR) of vegetation patches, which furthers sediment retention. Vegetation with important stem density, diameters, leaf areas, and density impact the HR. A functional structure composed of these negatively correlated traits involved in the increase of the HR would constitute a positive effect of the functional diversity. Methods: Runoff simulations were undertaken on four mono-specific and two multi-specific communities, using herbaceous plant species from North-West Europe, presenting six contrasting aboveground functional traits involved in the HR increase. Results: An effect of dominant traits in the community was found on the HR, identified as the community-weighted leaf density. The non-additive effect of functional diversity on the HR could be explained by the presence of species presenting large stems in the communities with high functional diversity. Conclusion: We argued that functional diversity effect on the HR could change due to idiosyncratic effects of the plant traits, which would be influenced by soil properties, phylogeny diversity, and plant species interactions. These findings constitute an advancement in the understanding of plant trait assemblage on runoff and soil erosion processes. View Full-Text
Keywords: functional diversity; hydraulic roughness; herbaceous vegetation; leaf and stem functional traits; plant–runoff interaction; soil erosion control functional diversity; hydraulic roughness; herbaceous vegetation; leaf and stem functional traits; plant–runoff interaction; soil erosion control
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MDPI and ACS Style

Kervroëdan, L.; Armand, R.; Saunier, M.; Faucon, M.-P. Functional Diversity Effects of Vegetation on Runoff to Design Herbaceous Hedges for Sediment Retention. Diversity 2020, 12, 131.

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