Volume 37, Number C1, February 2002ECORAD 2001: The Radioecology - Ecotoxicology of Continental and Estuatine Environments
|Page(s)||C1-255 - C1-258|
|Published online||14 October 2009|
137Cs and 210Pb profiles in North Morrocan soils: Inventories and erosion rate estimates
CEREGE, BP. 80, 13545 Aix-en-Provence, France
2 Department of Earth Sciences, Faculty Sciences and Technology, Natural Resources and Risks Observatory (ORRNA), BP. 416, Tangier, Morocco
Various studies have been conducted during the fast decade onto atmospheric deposited 210Pb and caesium isotopes in soils in order to quantify soil erosion rates. In North Morocco (Tangier area), erosion is a real problem leading to silting up of artificial lakes. Soil profiles were collected in cultivated areas from the catchment basin of one of this lake in order to quantify the erosion. 137Cs and 210Pb concentrations and inventories were measured and their spatial distribution was studied in relation with other parameters : granulometry, pH, organic matter content. Mean 137Cs inventory in stable soils was found to be 2582 Bq.m-2 in 1999, in agreement with literature data for Spanish and Portuguese soils. Depth profiles were usual, showing an exponential decrease with depth for 210Pb and a subsurface peak for 137Cs in reference soils where it was found until 30 cm depth. No clear relations appeared with organic matter content or pH and the distribution of the inventories is probably linked to erosion process. Estimated erosion rates varied from 5 to 66 t.ha-1y-1, but the use of different models for such estimation led to important differences.
© EDP Sciences, 2002
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