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Título

Field-scale study of the variability in pesticide biodegradation with soil depth and its relationship with soil characteristics

AutorRodríguez Cruz, M. Sonia ; Jones, J. E.; Bending, Gary D.
Palabras claveSpatial variability
Pesticide biodegradation
Soil depth
Sorption
Mineralisation
Isoproturon
Bentazone
Mecoprop
Fecha de publicación2006
EditorElsevier
CitaciónSoil Biology & Biochemistry, 2006 ( 38), 2910-2918
ResumenThe extent of within-field spatial variability of pesticide degradation was characterised in topsoil and subsoil, using the compounds isoproturon, bentazone and mecoprop, which are major contaminants of groundwater and surface freshwater in Europe. Twenty topsoil samples from 0 to 15 cm depth and twenty subsoil samples from 50 to 60 cm depth were collected from a single agricultural field within a 160 90 grid. It was shown that degradation rates of all compounds declined with soil depth. Variability of pesticide degradation rates, pesticide sorption and formation of non-extractable pesticide residues was higher in subsoil relative to topsoil. Furthermore, in the subsoil, there was variation in large scale soil physicochemical composition, which did not occur in topsoil. The greater variability in pesticide degradation rates in subsoil relative to topsoil could be the result of a greater range of degradation kinetics, which could reflect greater spatial variability in the distribution and/or activities of pesticide metabolising communities.
Versión del editorhttp://www.sciencedirect.com
URI10261/23885
DOI10.1016/j.soilbio.2006.04.051
ISSN0038-0717
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