Optimisation de l'apport de lisier sur des sols pollués (métaux) via le suivi des processus de nitrification

Autor: de La Fuente, C., Clemente, R., Martinez, José, Pilar Bernal, M.
Přispěvatelé: CENTRO DE EDAFOLOGÍA Y BIOLOGÍA APLICADA DEL SEGURA DEPARTMENT OF SOIL AND WATER CONSERVATION AND ORGANIC WASTE MANAGEMENT MURCIA ESP, Partenaires IRSTEA, Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), Gestion environnementale et traitement biologique des déchets (UR GERE), Centre national du machinisme agricole, du génie rural, des eaux et forêts (CEMAGREF), Irstea Publications, Migration
Jazyk: angličtina
Rok vydání: 2010
Předmět:
Zdroj: Chemosphere
Chemosphere, Elsevier, 2010, 5 (81), pp.603-610
ISSN: 0045-6535
Popis: Nitrification is often negatively affected by heavy metal pollution in soils, this limiting land revegetation. Thus, the potential use of pig slurry as a nitrogen-rich organic amendment in different heavy metal contaminated soils has been evaluated; this also being a way of recycling this waste. In order to identify the factors affecting nitrification processes in heavy metal polluted soils (soil pH, heavy metal solubility and the N source), incubation experiments were run using two polluted soils with different pH values (5.0 and 7.1) and a non-contaminated soil (pH 8.2). Ammonium was added as pig slurry or as ammonium sulphate for comparison (both added at 150 mg NHþ4 -N kg1 of soil). Pig slurry provoked higher nitrification rates and N-immobilisation than ammonium sulphate, especially in the neutral-polluted soil, reflecting an improvement of the microbial activity in the soil. The microbial immobilisation of N led to an inverse relationship between the amount of N added and nitrate conversion in the neutral-polluted soil and in the non-contaminated soil amended with different pig slurry dosages (75, 150 and 225 mg NHþ4 -N kg1 of soil). Low rates of nitrification and N-immobilisation were found in the acidic soil. Pig slurry addition to metal polluted soils enhanced soil nitrification, especially when metals were in low-solubility forms.
Databáze: OpenAIRE
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