Friday, 14 July 2006

Copper Distribution in Agricultural Topsoils in the Northeast of Spain. Multivariate Geoestatistical Methods to Identify Spatial Variations.

Jose Antonio Rodriguez martin Sr.1, Jose Manuel Grau Corbi Sr.1, and Manuel Lopez Arias Sr.2. (1) CIFOR INIA, carretera de A Coruña km 7.5, Madrid, Spain, (2) INIA, carretera de A Coruña km 7.5, Madrid, Spain

The spatial variability of heavy metal topsoils may be affected by soil parent materials and anthropogenic sources. The problems associated with the characterization of heavy metals in the majority of sites are often due to multiple sources of pollution. This study characterized and mapped the spatial variability patterns of copper and other soil parameters (the pH, organic matter, carbonates and granulometric fraction) in the Northeast of Spain. 624 soil samples were taken according to a regular 8 by 8 km square mesh in agricultural and grassland topsoil at depth of 0-25 cm. This study shows the spatial correlations and variations in this heavy metal measured within the area of interest. The average concentrationsobtained were 17.33±14.97 (mg/kg). Geostatistical methods were used to ascribe the bedrock influence and define the anthropogenically polluted areas. The spatial heavy metal map reveals that the highest source variations of copper are strongly correlated to parent rock, and the local anomalies (found in same samples) are attributed to anthropogenic influence

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