Abstract
In order to investigate the cycling of phosphorus in the Taihu Lake, a sequential extraction technique was used to separate different phosphorus forms in surficial sediments from the Wuli Bay of the Taihu Lake. The concentrations of total P are high in the sediments, with an average of 2. 80 mg g-1, and a variation range between 4. 02 and 2. 05 mg g-1. Total P is composed mainly of inorganic P (70%–90%), a large portion (75%–85% ) of which lies in the CDB-extractable iron oxide phase. The low Fe/P atomic ratios (2.0–5.3) indicate that the Fe compounds extracted with CDB have a lower proportion of relatively crystalline phases in all samples, and that the absorption between iron and phosphorus has probably reached certain equilibrium. Organic C/N atomic ratios (8.8–10. 6) for most of the samples are lower, which suggests a lacustrine authigenic source of organic matter in the sediments. Moreover, organic C/P atomic ratios (135–320) are usually higher than the Redfield ratio (106 : 1), showing that the organic phosphorus had been preferentially released via organic matter degradation during the early diagenesis process.
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Supported by the Knowledge Innovation Major Projects of Chinese Academy of Sciences (Nos. KZCX1-SW-12 and KZCX2-105).
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Jun, L., Congqiang, L., Shilu, W. et al. Vertical variation of phosphorus forms in surface sediments from Wuli Bay, Taihu Lake, China. Chin. J. Geochem. 25, 279–284 (2006). https://doi.org/10.1007/BF02840423
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DOI: https://doi.org/10.1007/BF02840423