Especiación Química y Biodisponibilidad del Fósforo en Sedimentos Recientes del Golfo de Paria, Venezuela
In this investigation, the fractions P-adsorbed or labile (F1), P-autigénic (F2), P-associated to oxides (F3), P-detrital (F4) and P-organic (F5), and the bioavailability of phosphorus in the sediments of the Gulf of Paria, Venezuela, were determined. The total phosphorus (PT) concentration ranged from 3.93-4.97 μmol P/g, and is mainly found in detrital and organic form. Different transport mechanisms and post-depositional mechanisms of particles of variable chemical composition are evidenced,
... ion are evidenced, which induce a decreasing gradient in the concentrations of the fractions with respect to the total phosphorus: P-detritic (47. 02% - 56.95%) > P-organic (38. 87% - 50.74%) >P-authigenic (1.14% - 2.28%) >P-associated with oxides (0.25% - 0.62%). The principal sources of detrital and organic phosphorus are associated with terrestrial lithogenic apatite from eroded material from the orogenic belts of the Andes and Coastal, Escudo Guayanés, and Venezuelan and Colombian plains. The Organic matter consists of trees (C3) and grasses (C4) from the savannas that is transported by the Orinoco river to its Delta and from there redistributed to the Gulf of Paria. Percentage of phosphorus between 0.50% - 2.64%, it is easily bioavailable for biota, between 39.12% and 51.36% is potentially and between48.17% - 58.43 is refractory.