Journal of the Serbian Chemical Society 2014 Volume 79, Issue 1, Pages: 101-112
https://doi.org/10.2298/JSC130121068O
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Effects of agricultural practices on properties and metal content in urban garden soils in a tropical metropolitan area
Ondo Jean Aubin (Aix-Marseille Université, CNRS, LCE, FRE, Marseille, France + Laboratoire Pluridisciplinaire des Sciences, Ecole Normale Supérieure, B.P. Libreville, Gabon)
Prudent Pascale (Aix-Marseille Université, CNRS, LCE, FRE, Marseille, France)
Massiani Catherine (Aix-Marseille Université, CNRS, LCE, FRE, Marseille, France)
Höhener Patrick (Aix-Marseille Université, CNRS, LCE, FRE, Marseille, France)
Renault Pierre (INRA, Unité "Climat, Sol et Environnement", Domaine Saint-Paul, Site Agroparc, Avignon Cedex, France)
The appearance of agriculture in urban areas improved the healthy diet of
people by the consumption of fresh vegetables and fruits. This study assessed
the level of fertility, the impact of cropping system and of exploitation
time on physicochemical properties and pseudo-total and EDTA-extractable
metals contents of urban garden of vegetable soils in Libreville (Gabon). The
results indicated a low fertility of cultivated soils. The metal contents in
soils were generally different between culture in open field and culture
under shelters. Except Al which could be toxic for cultivated vegetables, the
soil properties and metal element concentrations decreased significantly in
open field soil with time, while they did not vary in open shade structure
soils. The pseudo-total cadmium concentration was below detection limits in
all soils. The multivariate analysis showed that Al, Fe and Pb were of
lithogenic origin, and Cu, Zn and Mn were of anthropogenic origin.
Keywords: soil fertility, metal mobility, multivariate statistical analysis, Libreville