학술논문
Copper dynamics in vineyard topsoils as affected by the supply of aerated compost tea: insights from a batch experiment.
Document Type
Academic Journal
Author
Eon P; ISPA, Bordeaux Sciences Agro, INRAE, 33140 Villenave d'Ornon, France. Electronic address: pierre.eon@inrae.fr.; Ouerdane L; Université de Pau et des Pays de l'Adour, e2s UPPA, CNRS, IPREM-UMR 5254, Hélioparc, Pau, France.; Goupil A; Université de Pau et des Pays de l'Adour, e2s UPPA, CNRS, IPREM-UMR 5254, Hélioparc, Pau, France.; Vidal A; ISPA, Bordeaux Sciences Agro, INRAE, 33140 Villenave d'Ornon, France.; Cornu JY; ISPA, Bordeaux Sciences Agro, INRAE, 33140 Villenave d'Ornon, France.
Source
Publisher: Elsevier Applied Science Publishers Country of Publication: England NLM ID: 8804476 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1873-6424 (Electronic) Linking ISSN: 02697491 NLM ISO Abbreviation: Environ Pollut Subsets: MEDLINE
Subject
Language
English
Abstract
Aerated compost teas (ACTs) are rich in soluble humic substances (SHS) that have high affinity for metals, notably Cu. Using a batch experiment, we measured the extent to which two ACTs altered Cu dynamics in vineyard topsoils one day and 21 days after their addition. Soils were extracted with 0.01 M KCl, and total Cu concentration, free Cu ion fraction and size distribution of Cu ligands were measured in the extraction solution to assess the impact of ACT on the mobility of Cu. Diffusive gradient in thin film (DGT) measurements were carried out to assess the effect of ACT on Cu bioavailability, and the dissociation rate of Cu-SHS complexes was measured. The results revealed that ACT increased the mobility of Cu from a factor 1.2 to 5.8 depending on the soil, the ACT and the incubation time. Cu mobilization was associated with an increase in absorbance at 254 nm and a decrease in the free Cu ion fraction in the KCl extract. Associated with the strong agreement between the size distribution of SHS and that of Cu ligands in the KCl extract of soils treated with ACT, these results showed that Cu was mobilized through complexation by the SHS present in ACTs. A fraction of the SHS supplied with ACTs sorbed onto the soil constituents, notably in calcareous soils where this fraction reached 86% for ACT B. Between 15% and 50% of the SHS remaining in solution degraded between day one and day 21 under the presumed action of microflora. This explains why the Cu mobilization efficiency of ACTs was on average lower in calcareous soils than in non-calcareous soils, and decreased with time. Lastly, ACT increased the bioavailability of Cu in soils from a factor 1.3 to 4.2, due to the relatively high dissociation rate of Cu-SHS complexes.
Competing Interests: Declaration of Competing Interest ☒ The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. ☐ The authors declare the following financial interests/personal relationships which may be considered as potential competing interests:
(Copyright © 2024. Published by Elsevier Ltd.)
Competing Interests: Declaration of Competing Interest ☒ The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. ☐ The authors declare the following financial interests/personal relationships which may be considered as potential competing interests:
(Copyright © 2024. Published by Elsevier Ltd.)