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首页> 外文期刊>Chinese Journal of Geochemistry >Vertical variation of phosphorus forms in surface sediments from Wuli Bay, Taihu Lake, China
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Vertical variation of phosphorus forms in surface sediments from Wuli Bay, Taihu Lake, China

机译：太湖五里湾表层沉积物中磷形态的垂直变化

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摘要

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.
机译：为了研究磷在太湖中的循环，采用序贯提取技术分离了太湖五里湾表层沉积物中不同磷的形态。沉积物中总磷浓度较高，平均为2. 80 mg·g〜（-1），变化范围为4.0。2至2. 05 mg·g〜（-1）。总磷主要由无机磷（70％-90％）组成，其中很大一部分（75％-85％）位于CDB可提取的氧化铁相中。低的Fe / P原子比（2. 0-5. 3）表明，用CDB萃取的Fe化合物在所有样品中具有较低比例的相对结晶相，铁和磷之间的吸收可能已达到一定的平衡。大多数样品的有机C / N原子比（8.8-10.6）较低，这表明沉积物中有机质的湖相自生来源。此外，有机C / P原子比率（135 -320）通常高于Redfield比率（106：1），表明有机磷已在成岩过程早期通过有机物降解而优先释放。

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