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Master Thesis

Convertir des potagers associatifs pollués, jardinés par les habitants, en jardin public nourricier : étude de la Contrie, un site de jardins familiaux à dépolluer

Abstract : Growing vegetables in the city is a growing concern for city dwellers while soils are still unknown and little studied. Urban soils are now known to keep traces of past or recent pollution. Before 2012, not any soil analysis was carried out before the establishment of allotment gardens in Nantes. The city relies on research carried out by local scientists for the management of its collective gardens: action thresholds have been defined from the four levels of anomalies suggested by Le Guern et al. (2013) in order to prevent health risks. The allotment gardens of the Contrie have contents of lead (Pb) and copper (Cu), to a lesser extent, above the respective thresholds of 100 mg/kg and 60 mg/kg. A management plan has been established with the advices of Cécile Le Guern (BRGM). The scenarios both tend towards a partial remediation of the soil and a reconversion of part of the contaminated gardens into an edible public garden. Compatibility between feeder functions and lead contaminated soils was verified. The fruits accumulate little Pb with a variable accumulation according to the category of fruit (nuts < pome and stone fruits < berries). Chicken eggs accumulate very little lead: the “worst case scenarios” (417 and 458 µg Pb/kg) have minimal provisional tolerable weekly intake (PTWI) for eggs (2.25 and 1.4%). Honey is the matrix that accumulated the least Pb compared to pollen and bees.
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Master Thesis
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https://dumas.ccsd.cnrs.fr/dumas-03040913
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Submitted on : Friday, December 4, 2020 - 4:09:42 PM
Last modification on : Tuesday, December 8, 2020 - 3:09:57 AM
Long-term archiving on: : Friday, March 5, 2021 - 7:20:49 PM

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Lucie Dussaule. Convertir des potagers associatifs pollués, jardinés par les habitants, en jardin public nourricier : étude de la Contrie, un site de jardins familiaux à dépolluer. Sciences du Vivant [q-bio]. 2020. ⟨dumas-03040913⟩

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