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Data from: Canopy facilitation outweighs elemental allelopathy in a metalliferous system during an exceptionally dry year

Cite this dataset

Randé, Hugo; Michalet, Richard; Nemer, David; Delerue, Florian (2024). Data from: Canopy facilitation outweighs elemental allelopathy in a metalliferous system during an exceptionally dry year [Dataset]. Dryad. https://doi.org/10.5061/dryad.kwh70rzd4

Abstract

The Elemental Allelopathy hypothesis states that the metal-rich litter of hyper-accumulating species may have a detrimental impact on neighbouring plants giving a competitive advantage to hyper-accumulators. Here, we aim to specify the conditions of application of this hypothesis in realistic field conditions, and its relative importance compared to other positive effects found in metalliferous systems. We disentangled the litter-induced elemental allelopathy and canopy effects of two metallophyte species (Arenaria multicaulis and Hutchinsia alpina) with different levels of leaf Zn and Cd accumulation on two ecotypes of Agrostis capillaris with different levels of metal tolerance. The experiment was conducted in two habitats with contrasting pollution levels in a former mining valley in the Pyrenees (France). The metallophyte species that accumulates more metals (Hutchinsia alpina) showed a strong elemental allelopathy effect on the target with lower metal tolerance in the habitat with lower pollution level, while the metallophyte species that accumulates less metals (Arenaria multicaulis) had no litter effect. Both metallophyte species had positive canopy effects likely due to the improvement of micro-climatic conditions. The drought that occurred during the experiment may have influenced these canopy effects, increasing their importance during the course of the study. For Hutchinsia alpina the positive canopy effects were stronger than the negative litter effects, resulting in overall positive effects on both target ecotypes.

Synthesis. Our results brought a better understanding of the occurrence of elemental allelopathy in metallophyte communities and its relative importance as compared to micro-climatic facilitation in a global warming context.

README: Title of Dataset:


Dataset of final survival data, Plant-Plant Interactions (Imp and RII), metal concentration in soils, metal concentration in leaves, litter decomposition rates and traits values of both metallophyte species in our study

Description of the Data and file structure

Final survival

Final binary survival data of all targets individuals (surv, 1= alive, 0= dead, NA=missing values due to disturbance of the plant individuals). "Block" column designate the number of the block. "Habitat" column designate the habitat at stake. "Metallophyte species" column designate the plant species at stake. "Neighbouring modality" column designate the neighbouring treatment in which the target grows. "Agrostis ecotype" column designate the level of tolerance to metals of targets.

Imp

Different Imp values calculated with final survival rates. "Block" column designate the number of the block. "Habitat" column designate the habitat at stake. "Metallophyte species" column designate the plant species at stake. "Imp type" column designate the type of index at stake. "Agrostis ecotype" column designate the level of tolerance to metals of targets.

RII

Different RII values calculated with final survival rates. "Block" column designate the number of the block. "Habitat" column designate the habitat at stake. "Metallophyte species" column designate the plant species at stake. "RII type" column designate the type of index at stake. "Agrostis ecotype" column designate the level of tolerance to metals of targets.

Metal concentration in soils

Metal concentration values (C, in mg/kg) in the soils under both metallophyte species. "Block" column designate the number of the block. "Habitat" column designate the habitat at stake. "Metallophyte species" column designate the plant species at stake. "Metal" column designate the type of metal at stake.

Metal concentration in leaves

Metal concentration values (C, in mg/kg) in the leaves of both metallophyte species."Block" column designate the number of the block. "Metallophyte species" column designate the plant species at stake. "Metal" column designate the type of metal at stake.

Litter decomposition rates

Differents decomposition rates (dec, %) for the litter of both metallophyte species. "Block" column designate the number of the block. "Habitat" column designate the habitat at stake. "Metallophyte species" column designate the plant species at stake.

Plant traits

Differents traits values for both metallophyte species. "Metallophyte species" column designate the plant species at stake. "Trait" column designate the type of trait (SLA= Specific Leaf Area in cm²/g, LDMC= Leaf Dry Matter Content in %).

Funding

Agence Nationale de la Recherche, Award: ANR-19-CE02-0013-01