Abstract Surface sediments and three sediment cores from the western basin and one sediment core from the Sandusky basin were analyzed to document spatial and temporal changes in five phosphorus fractions and total phosphorus (TP). The areal distributions of the bioavailable fractions NaCl-Pi, NaBD-Pi, and NaOH-Pi and the refractory organic fraction Res-P were broadly consistent and contrasted with those of the detrital fraction HCl-Pi which showed that high concentrations occurred mostly in high-energy littoral zones and low concentrations largely in profundal depositional areas. The contrasting distributions were induced by interactions among tributary inputs, wave action, circulation, and biogeochemical cycling and transfer in the basin. As revealed by the Sandusky basin sediment record, the detrital fraction HCl-Pi was dominant (70% of TP) during European settlement and decreased rapidly by 28.0% in the early 1910s due largely to impoundments of the Maumee and Sandusky Rivers. While HCl-Pi has ever since remained relatively constant, NaCl-Pi, NaBD-Pi, and NaOH-Pi increased significantly between 1950 and 1970 in the two basins. However, the post-regulation sediment records differed considerably among these coring sites. There was a marked increase of TP in two cores, corresponding to recent return of eutrophication and massive harmful algal blooms but contrasting with a relatively constant, low loading into the lake. This signified the role of internal loading as derived partialy from legacy pollution. Furthermore, NaCl-Pi has increased progressively throughout all the records. We conclude that the increased levels of NaCl-Pi in surface sediments may have altered the internal loading and contributed to the resurgences of harmful algal blooms in Lake Erie.

中文翻译：

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伊利湖西部和桑达斯基盆地沉积磷含量的变化

摘要 分析了西部盆地的表层沉积物和三个沉积物芯以及桑达斯基盆地的一个沉积物芯，以记录五种磷组分和总磷 (TP) 的时空变化。生物可利用组分 NaCl-Pi、NaBD-Pi 和 NaOH-Pi 以及难降解有机组分 Res-P 的面积分布与碎屑组分 HCl-Pi 的面积分布基本一致并形成对比，后者表明高浓度主要发生在高浓度。 - 能源沿岸带和低浓度主要位于深部沉积区。对比分布是由流域内支流输入、波浪作用、环流和生物地球化学循环和转移之间的相互作用引起的。正如桑达斯基盆地沉积物记录所揭示的那样，在欧洲定居期间，碎屑部分 HCl-Pi 占主导地位（TP 的 70%），并在 1910 年代初期迅速下降了 28.0%，这主要是由于 Maumee 和 Sandusky 河的蓄水。虽然此后 HCl-Pi 一直保持相对稳定，但 NaCl-Pi、NaBD-Pi 和 NaOH-Pi 在 1950 年至 1970 年间在两个盆地中显着增加。然而，这些取心点之间的调节后沉积物记录差异很大。两个核心的 TP 显着增加，对应于最近恢复的富营养化和大量有害藻华，但与相对稳定的低负荷进入湖形成对比。这意味着内部加载的作用部分源自遗留污染。此外，NaCl-Pi 在所有记录中都逐渐增加。