کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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4409498 | 1307487 | 2013 | 8 صفحه PDF | دانلود رایگان |

In order to assess the impact of in situ energy crop cultivation on Cu, Pb, Zn and Cd availabilities in an area contaminated by atmospheric fallout, a parcel divided in two parts was sampled: one under perennial miscanthus since three years and the other staying under annual crops used as reference. Metal availability parameters determined using EDTA extractions at equilibrium and kinetic extractions were related to metal localization in size fractions after physical fractionation. Extraction at equilibrium as well as kinetically defined labile pools highlighted significantly lower Cu and Pb availabilities in the soil under miscanthus compared to the annual crop reference while physical fractionations highlighted an increased localization of these metals in the fine size fractions. For Zn and Cd, changes in metal availability were highlighted only through the kinetic parameters of extraction rate constants while localization in size fractions changed for Cd only. Indeed for these metals extraction at equilibrium and kinetically defined labile and slowly labile pools failed to show some changes. Organic carbon percentage was significantly higher in the 20–50 μm and 200–2000 μm fractions for the miscanthus sample underlying the importance of no-tillage and organic carbon inputs. Pearson correlations among metal availability parameters and metal and organic carbon localizations were used to identify the more important fractions involved in the metal availability. Results revealed that available metal pools were related to metal localization in the finer soil fractions (<50 μm) and to the organic carbon localization in the 20–50 μm and 200–2000 μm fractions.
► Impact of miscanthus on trace metal availability in contaminated soil was assessed.
► A combined approach of chemical extraction and physical fractionation was used.
► Metal availability was related to metal and carbon localizations in soil fractions.
► Cu and Pb availabilities were lower under miscanthus compared to an annual crop.
► Changes in Zn and Cd availabilities were shown only through kinetic extractions.
Journal: Chemosphere - Volume 91, Issue 3, April 2013, Pages 287–294