Abstract
ABSTRACT In this study, eighteen surficial sediments were collected from two shallow lagoons of the Red Sea, King Saudi Arabia (Al-Shaibah and Al-Budhia lagoons), and analyzed for their grain size, CaCO3, and organic matter (O.M.) contents. The concentration of total phosphorus (TP), Organic-P (OP), and Inorganic-P (IP) were determined. In addition, Phosphorus bioavailability was also investigated by a sequential extraction procedure. The results of the current study showed variation in the levels of total phosphorus and the organic and inorganic form (TP, IP, OP). Al-Shaibah lagoon showed higher TP contents (274.78–389.24 and 265.91 ± 29.03 µgg-1) more than Al-Budhia lagoon (227.25–318.55 and 265.91 ± 29.03 µgg-1). The distribution of phosphorus bioavailability concentrations in the studied fractions in Al-Shaibah lagoon sediments was increased in the following order: hot H2O-P (0.10–0.25µgg−1) < NaHCO3-P (1.85–3.11 µgg−1) < exchangeable fraction (NH4Cl-P; 2.64–10.64 µgg−1) < Fe and Al-associated phosphorus (NaOH-P; 29.67–7.32 µgg−1). A similar order was observed in the Al-Budhia lagoon with slight differences in its content. The different fractions of the contribution of phosphorous bioavailability from the Total-P concentration were recorded as: NaOH-P (14.63–18.62%) >> NH4Cl-P (2.11–1.99%) > NaHCO3-P (0.75–1.04%) >H2O-P (0.05–0.09%). The phosphorus concentrations in the HCl-P fraction (calcium-associated phosphate/apatite) represent 32.67–59.60% of the total phosphorus in lagoon sediments.
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