Abstract
Medicago sativa was cultivated at a former harbor facility near Bordeaux (France) to phytomanage a soil contaminated by trace elements (TE) and polycyclic aromatic hydrocarbons (PAH). In parallel, a biotest with Phaseolus vulgaris was carried out on potted soils from 18 sub-sites to assess their phytotoxicity. Total soil TE and PAH concentrations, TE concentrations in the soil pore water, the foliar ionome of M. sativa (at the end of the first growth season) and of Populus nigra growing in situ, the root and shoot biomass and the foliar ionome of P. vulgaris were determined. Despite high total soil TE, soluble TE concentrations were generally low, mainly due to alkaline soil pH (7.8–8.6). Shoot dry weight (DW) yield and foliar ionome of P. vulgaris did not reflect the soil contamination, but its root DW yield decreased at highest soil TE and/or PAH concentrations. Foliar ionomes of M. sativa and P. nigra growing in situ were generally similar to the ones at uncontaminated sites. M. sativa contributed to bioavailable TE stripping by shoot removal (in g ha−1 harvest−1): As 0.9, Cd 0.3, Cr 0.4, Cu 16.1, Ni 2.6, Pb 4, and Zn 134. After 1 year, 72 plant species were identified in the plant community across three subsets: (I) plant community developed on bare soil sowed with M. sativa; (II) plant community developed in unharvested plots dominated by grasses; and (III) plant community developed on unsowed bare soil. The shoot DW yield (in mg ha−1 harvest−1) varied from 1.1 (subset I) to 6.9 (subset II). For subset III, the specific richness was the lowest in plots with the highest phytotoxicity for P. vulgaris.
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Abbreviations
- BTEX:
-
Benzene toluene ethylbenzene xylene
- CEC:
-
Cationic exchange capacity
- DGT:
-
Diffusive gradients in thin-film
- DOM:
-
Dissolved organic matter
- DW:
-
Dry weight
- EC:
-
Electrical conductivity
- EXAFS:
-
Extended x-ray absorption fine structure
- FCA:
-
Factorial correspondence analysis
- GRO:
-
Gentle remediation option
- ISO:
-
International organization for standardization
- Mg:
-
Megagram
- MPC:
-
Maximum permitted concentration in green forages in France
- OM:
-
Organic matter
- PAH:
-
Polycyclic aromatic hydrocarbons
- PCA:
-
Principal component analysis
- PCB:
-
Polychlorinated biphenyls
- SPW:
-
Soil pore water
- TE:
-
Trace element
- THC:
-
Total hydrocarbons
- UCT:
-
Upper critical threshold concentration in feedstuff
- USEPA:
-
United State Environmental Protection Agency
- WHC:
-
Water holding capacity
- XANES:
-
X-ray Absorption near edge structure
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Acknowledgments
This work was financially supported by the city of Bordeaux (D 2013–111). Authors greatly thank W. Galland (Master student) from the UMR BIOGECO INRA 1202 (Bordeaux, France), for his precious help, both on the field and in the laboratory. This study was carried out in the framework of the Cluster of Excellence COTE.
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Medicago sativa well developed on an alkaline soil highly contaminated by trace elements and polycyclic aromatic hydrocarbons at a former harbor dock and displayed low trace element concentrations in its shoots. Phaseolus vulgaris was a relevant bioindicator of soil phytotoxicity.
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Marchand, L., Sabaris, CQ., Desjardins, D. et al. Plant responses to a phytomanaged urban technosol contaminated by trace elements and polycyclic aromatic hydrocarbons. Environ Sci Pollut Res 23, 3120–3135 (2016). https://doi.org/10.1007/s11356-015-4984-7
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DOI: https://doi.org/10.1007/s11356-015-4984-7