Sedimentary Phosphorus Forms Under Disturbances and Algae in Taihu Lake
【Abstract】Sedimentary phosphorus forms were investigated to clarify the release of sedimentary phosphorus forms under the repeated disturbance with the addition of algae at different initial concentrations. The sediments and overlying water were taken from the Meiliang Bay in Taihu Lake. The results showed that the concentrations of NH4Cl-P and Res-P decreased, while the content of Fe/ Al-P and CaP increased without disturbance. In addition, the Ca-P increased with the increase of the initial concentration of algae and the net increase of Ca-P increased by 48% (30 μg·L−1), 66% (60 μg·L−1), 74% (120 μg·L−1), respectively. However, under the disturbance, the NH4Cl-P and Res-P were significantly reduced, the Fe/Al-P increased significantly. The percentage of Fe/Al-P to TP was up to 66.2% (average of the 3 experiments with the addition of algae of 30 μg·L−1, 60 μg·L−1 and 120 μg·L−1), it was higher than the value (53.4%, average of the 3 experiments) without the disturbance. Moreover, under the disturbance, the percentage of Ca-P to TP was 24.1% (average of the 3 experiments with the addition of algae of 30 μg·L−1, 60 μg·L−1 and 120 μg·L−1) and it was slightly lower than that (33.0%, average of the 3 experiments) without the disturbance. It is suggested that the coexistence of disturbance and algae facilitated the formation of Fe/ Al-P, but the algae accelerated the formation of Ca-P without disturbance.
【Keywords】 disturbance; algae; phosphorus; sediment; migration and transformation; Taihu Lake;
(Translated by 刘涛)
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