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Distribution of heavy metals in rice farming soils of a coastal wetland (L'Albufera de Valencia, Spain)

AuthorsAndreu Pérez, V. ; Gimeno-García, Eugenia ; Pascual, Juan Antonio
Issue DateJul-2012
PublisherEuropean Confederation of Soil Science Societies
CitationEUROSOIL 2012
AbstractOne of the most important zones on rice production in Europe is located in Valencia (Spain), in particular in the coastal wetland of L'Albufera. This wetland, included in the RAMSAR Agreement, was in great part drained and converted to rice farming during the XIX century. In this rice area, 18 sampling zones were selected to determine the degree of heavy metals incidence in soils. Total concentrations of Cd, Co, Cr, Cu, Ni, Pb, and Zn were evaluated. Their distribution in the surficial and sub-surficial horizons was determined together with the temporal variability of metals concentrations during 1991-2009. Results show that the highest metal concentrations correspond to Zn, Cr and Cu. However, all metals have levels below the limits established by legislation, except for Cr that exceeds them in several zones showing a maximum of 254.93 ppm. In general, heavy metals showed an accumulation in soil surface, except for Co that has their highest values in the AB horizon. Soil salinity and related cations, mainly Na and K, are the main parameters that control the behavior of metals in these soils. Co, Cr, Pb and Zn contents are the parameters more influenced by this. This could be due to climate changes toward a high aridity, which could affect the concentration of salts and the marine intrusion in this area. Cu and Zn also show strong relationships with the available phosphorous levels. Through the study of the temporal evolution of these metals, a general decrease of their concentrations in the subsurface horizons was observed, except for the case of Cr.
DescriptionPonencia presentada en EUROSOIL 2012 celebrado en Bari (Italia) del 2 al 6 de julio de 2012
Appears in Collections:(CIDE) Comunicaciones congresos
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