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Organic amendments increase biochemical status in an acid soil contaminated by trace elements

AuthorsMontiel Rozas, M. M.; Domínguez, María Teresa ; Madejón, Paula ; Madejón, Engracia
Issue Date16-Jul-2017
PublisherInternational Conference Biogeochemistry of trace Elements
CitationBook of Abstracts of 14th International Conference on the Biogeochemistry of Trace Elements (ICOBTE) pag. 218 (2017)
AbstractThe use of organic amendments has been proposed as a low input alternative for remediation of trace element contaminated soils. However, the use of in situ organic amendments for chemical stabilization of inorganic pollutants requires some indication of the longevity and sustainability of their effects. We tested the effectiveness of single and repetitive additions of two organic amendments on trace element stabilization and on several biochemical and biological properties of an acidic contaminated soil. The study site was a plot affected by the Aznalcóllar mine sludge spill. The only remediation work carried out in this field was the removal of the sludge from the surface of the soil together with a layer of soil (10-15 cm). An experimental field trial was established within a plot (20 x 50 m) divided into 9 subplots. Two amendments (biosolid compost (BC) and leonardite (LE)) were tested. Half of the subplots (BC4, LE4) received amendments for four years (2002, 2003, 2006 and 2007) whereas the other half (BC2, LE2) received amendments only for two years (2002-2003). To compare, plots without amendments (NA) were also established. Soil sampling for this study was performed in September 2015, thirteen years after the start of the experiment. Both organic amendments significantly increased pH and TOC contents of amended soils, accompanied by reduced trace element extractability (CaCl2 extraction). However, the need for repeated amendment applications to sustain these conditions was clear as the alkalization and increase of organic matter was more noticeable in BC4 and LE4. Microbiological status was evaluated by the measure of several enzymatic activities (β-glucosaminidase, -glucosidase, phenol oxidase, urease and dehydrogenase) and microbial biomass carbon (MBC). Moreover, soil microbial community structure was evaluated by the Phospholipid Fatty Acid Analysis (PLFA). In general all these parameters pointed out to the increase in the quality of the microbiological status in soils treated with the organic amendments, being this improvement highly dependent on the nature of the amendment and the doses applied.
DescriptionComunicación oral presentada en el 14th International Conference on the Biogeochemistry of Trace Elements 16-20 July, 2017 - ETH Zurich, Switzerland. Abstracts
Publisher version (URL)http://icobte2017.ch/index.php/program
Appears in Collections:(IRNAS) Comunicaciones congresos
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