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Communication Dans Un Congrès Année : 2023

Restoration worse than invasion? Insights from a comparative study on soil biota and functioning in the case of Reynoutria spp.

Résumé

Reynoutria complex of species is widely known as part of the worst invasive alien plant species worldwide. These rhizomatous species originating from Eastern Asia are able to rapidly dominate plant communities along riverbanks. They are known to affect plant diversity and soil ecosystem functioning through their high growth rate, thick litter and allelopathical properties. Because of their high resprouting ability, the efficiency of traditional management methods is hardly achieved at the cost of intense efforts. Managers are therefore turning to alternative methods such as planting competitive native plants to both limit the dominance of the invaders and restore native plant diversity. If several papers found that Reynoutria species alter soil properties, no study has ever investigated the effect of such management methods after invasion. Through an observational study on seven paired-sites (restored /invaded/references) along two riverbanks in France, we measured soil chemical properties along with enzyme activities, soil microbiology, soil fauna as well as plant biodiversity to understand the changes induced by Reynoutria invasion and by management planting methods. Our results confirm drastic effects of Reynoutria species on plant diversity and high benefit of the restoration method on flora. However, considering the soil compartment, chemistry and microbial activity were more altered on restored banks than on the invaded banks compared to reference banks and we observed a disconnection between plant community and soil functioning in restored plots. We discuss these results in the light of the age of the restoration and question the management practices that reshape the soil.
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Dates et versions

hal-04279874 , version 1 (10-11-2023)

Identifiants

  • HAL Id : hal-04279874 , version 1

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Fanny Dommanget, Matthieu Chauvat, Estelle Forey, Adeline François, Amandine Erktan, et al.. Restoration worse than invasion? Insights from a comparative study on soil biota and functioning in the case of Reynoutria spp.. EMAPI 2023, Oct 2023, Pucon, Chile, Chile. ⟨hal-04279874⟩
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