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首页> 外文期刊>Estuarine Coastal and Shelf Science >Potentially mobile pools of phosphorus and silicon in sediment from the Bay of Brest: Interactions and implications for phosphorus dynamics
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Potentially mobile pools of phosphorus and silicon in sediment from the Bay of Brest: Interactions and implications for phosphorus dynamics

机译：布雷斯特湾沉积物中磷和硅的潜在流动池：相互作用及其对磷动力学的影响

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摘要

Competitive interactions between silicate and phosphate at ligand exchange sites in the sediment surface layer may increase the release of phosphorus (P) from the sediment into the water column. In this study, the role of silicon (Si) in the release of P from the sediment surface layer was studied in a marine estuarine environment, the Bay of Brest, with the aid of a sequential sediment fractionation procedure developed for P, and the addition of inorganic or diatom-bound Si to surface sediment samples in vitro. The potentially mobile pools of P in the surface sediment (loosely bound P + Fe/Al-bound-P) amounted to 5.0 μmol g~(-1) dry sed., 42% of the total extractable and 33% of the total amount of P in the sediment, while the similarly extracted pools of Si were bigger (ca. 20 μmol g~(-1) dry sed., 50% of the total extractable Si). Additions of inorganic Si increased the concentration of dissolved P in the sediment interstitial water in a bottle experiment, and the addition of both inorganic Si and cultivated diatoms to intact sediment cores increased the outward flux of dissolved P. Model calculations based on the regression equation from the bottle experiment and Si and P water column data showed that the sedimentation of spring diatoms could cause Si pulses to the sediment which would produce a P flux to the water column of ca. 44 μmol m~(-2) d~(-1). Field data from the bay show that in spring, decreases in P and Si and an increase in chl a due to diatom production are often followed by a small separate P peak which may be caused by Si-induced P fluxes from the sediment surface.
机译：沉积物表面层中的配体交换位点上的硅酸盐和磷酸盐之间的竞争性相互作用可能会增加磷（P）从沉积物中向水柱的释放。在这项研究中，借助为P开发的顺序沉积物分级分离程序，研究了在海洋河口环境布雷斯特湾中硅（Si）在P从沉积物表层释放的作用。无机或硅藻结合的硅在体外对表面沉积物样品的分析。表层沉积物中潜在的P流动库（松散结合的P + Fe / Al结合的P）为5.0μmolg〜（-1）干物质，占可提取总量的42％，占总量的33％沉积物中磷的含量，而相似提取的硅库更大（约20μmolg〜（-1）干物质，占可提取硅总量的50％）。在瓶装实验中，添加无机硅可增加沉积物间隙水中溶解的P的浓度，在完整的沉积物芯中添加无机Si和栽培的硅藻均可增加溶解P的向外通量。基于回归方程的模型计算基于瓶实验和Si和P水柱的数据表明，春季硅藻的沉积可能导致Si脉冲进入沉积物，从而产生大约Ca的水柱的P通量。 44μmolm〜（-2）d〜（-1）。海湾的现场数据表明，春季时，由于硅藻的产生，P和Si的减少以及chl a的增加通常伴随着一个小的单独的P峰，这可能是由Si诱导的P从沉积物表面产生的P通量引起的。

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