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首页> 外文期刊>Oceanologia >Sedimentary deposition and reflux of phosphorus (P) in the Eastern Gotland Basin and their coupling with P concentrations in the water column
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Sedimentary deposition and reflux of phosphorus (P) in the Eastern Gotland Basin and their coupling with P concentrations in the water column

机译：东哥得兰盆地沉积物中磷的沉积和回流及其与水柱中磷的浓度耦合

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摘要

In order to describe the role of sedimentary processes for the phosphorus (P) cycle in the open Baltic Proper, P deposition and reflux were quantified for the predominately anoxic sediments of the Eastern Gotland Basin. The study is based on investigations of 53 surface sediment samples and pore water samples from 8 sediment cores. The average P deposition rate was estimated at 0.20 g ± 0.18 g -2 yr-1, the fluctuation being due to variable bulk sediment deposition rates. P refluxes were estimated by applying Fick's First Law of Diffusion. A fairly good positive correlation between sedimentary P deposition and P release was obtained. P release from sediments by diffusion exceeds net P deposition by a factor of 2. This suggests that 2/3 of the deposited gross P is recycled in the sediments and released back into the water column; only 1/3 remains in the sediment permanently. A budget calculation demonstrates that the released dissolved inorganic phosphorus (DIP) accounts for the observed increase in DIP concentrations in the deep water during periods of stagnation, which is noticeable even at the surface P concentrations. Under such conditions and with the present remediation conditions it is not possible to freely manage P concentrations in the water column on short time scales.
机译：为了描述沉积过程对露天波罗的海中磷（P）循环的作用，定量了东部哥特兰盆地的主要缺氧沉积物的P沉积和回流。该研究基于对来自8个沉积物岩心的53个地表沉积物样品和孔隙水样品的调查。 P的平均沉积速率估计为0.20 g±0.18 g -2 yr-1，该波动是由于不同的整体沉积速率所致。通过应用Fick的第一扩散定律估算P反流。沉积磷的沉积与磷的释放之间有相当好的正相关。通过扩散从沉积物中释放出的P超过净P沉积的2倍。这表明沉积的总P的2/3在沉积物中再循环并释放回水柱中。永久只有1/3保留在沉积物中。预算计算表明，释放的溶解无机磷（DIP）导致停滞期间深水中DIP浓度的增加，即使在表面P浓度下也很明显。在这样的条件下以及在目前的修复条件下，不可能在短时间内自由管理水柱中的P浓度。

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