Phosphorus Fractionation in the Sediment of a Natural Lake

Abstract:

Seven typical surface sediments were collected along the flow direction in the hypertrophic Qixinghu lake located in Nansi Lake Basin. The sediments were evaluated on the basis of phosphorus (P) fractionation by sequential extraction scheme. Sedimentary phosphorus were fractioned into six forms (Ex-P, Al-P, Fe-P, BD-P, Ca-P and Org-P) to reveal phosphorus removal mechanism. The rank order according to the content of P-fractions was Ca-P > Org-P > Al-P > Fe-P > Ex-P > BD-P. The permanent Ca-P showed considerable contribution (41.97%-73.15%) to the sedimentary P-loads. The relative contributions of Ex-P to total sedimentary phosphorus (TP) ranged from 0.91% to 4.64%, which was positively correlated with alkaline phosphatase activity (r=0.8480). TP and Org-P were positively correlated with organic matter (OM) (r=0.8577 and r=0.9237, respectively). Total phosphorus concentration in the sediment fluctuated with changes in water quality and substrate characteristics. The high content of sedimentary metal elements and OM are contributed to the phosphorus accumulation and adsorption.

• Periodical: Applied Mechanics and Materials (Volumes 361-363)
• Pages: 751-754
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.361-363.751
• Online since: August 2013
• Authors: Song Bo Cui*, Hua Yong Zhang, Bing Bing Liu
• Keywords: Alkaline Phosphatase, Phosphorus Fractionation, Sediment

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