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首页> 外文期刊>Journal of soil & sediments >Composition and settling properties of suspended particulate matter in estuaries of the Chesapeake Bay and Baltic Sea regions
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Composition and settling properties of suspended particulate matter in estuaries of the Chesapeake Bay and Baltic Sea regions

机译：切萨皮克湾和波罗的海地区河口中悬浮颗粒物的组成和沉降特性

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Purpose: Our goal was to understand how differences in source material (allochthonous vs. autochthonous) and phytoplankton communities (diatoms vs. cyanobacteria) influence composition and settling properties of suspended particulate matter.Materials and methods: We characterized the composition and settling properties of suspended particulate matter in two systemsone which has a high hydrologic loading factor (watershed to surface area ratio), and a diatom-dominated phytoplankton community (James River Estuary, USA), and a second, where hydrologic inputs are proportionally smaller, and the summer phytoplankton community is dominated by cyanobacteria (Curonian Lagoon, Lithuania).Results and discussion: In the James, we found that TSS concentrations were positively related to discharge, whereas POC concentrations were negatively correlated with discharge and positively correlated with Chl-a. We infer that suspended particulate matter in this system was largely derived from allochthonous inputs, but that the organic matter fraction was derived from autochthonous production. In the Curonian Lagoon, TSS concentrations were correlated with Chl-a, but not discharge, indicating that suspended particulate matter was largely of autochthonous origin. In the James, the proportion of settleable materials was greater during high TSS concentrations, indicating that high discharge events delivered heavier particulates. In the Curonian Lagoon, we observed a seasonal decline in settling rates associated with the shift from mixed (diatoms and chlorophytes) to cyanobacteria-dominated phytoplankton, which we attribute to the presence of positively buoyant cyanobacteria.Conclusions: We found that a comparative approach yielded useful insights regarding sources, composition, and settling properties of suspended particulate matter in two estuaries that differ in hydrologic loading and phytoplankton community composition. Our findings suggest that the presence of positively buoyant cyanobacteria favors export losses of particulate C, N, and P to marine waters over retention through sedimentation in transitional zones.
机译：目的：我们的目标是了解源物质（散落物与本地鱼类）和浮游植物群落（硅藻与蓝藻）的差异如何影响悬浮颗粒物的组成和沉降特性。材料和方法：我们表征了悬浮物的组成和沉降特性两个系统中的颗粒物，一个具有较高的水文负荷因子（分水岭与表面积之比），一个以硅藻为主的浮游植物群落（美国James River Estuary），第二个系统中，水文学输入量成比例减小，而夏季则为浮游植物结果和讨论：在詹姆斯中，我们发现TSS浓度与放电呈正相关，而POC浓度与放电呈负相关，而与Chl-a呈正相关。我们推断该系统中悬浮的颗粒物主要来自异源输入，而有机物部分则来自自生产物。在库尔斯沙嘴泻湖中，TSS浓度与Chl-a相关，但与排放无关，这表明悬浮颗粒物很大程度上是自生的。在詹姆斯地区，高TSS浓度下可沉降物质的比例更高，这表明高排放事件释放出较重的颗粒。在库尔斯沙嘴泻湖中，我们观察到沉降速率的季节性下降，这与混合藻（硅藻和绿藻类）向蓝藻为主的浮游植物的迁移有关，这归因于存在阳性浮力蓝藻。关于水体负荷和浮游植物群落组成不同的两个河口中悬浮颗粒物的来源，组成和沉降特性的有用见解。我们的研究结果表明，阳性浮力蓝细菌的存在有利于颗粒碳，氮和磷向海水的出口损失，而不是通过过渡带中的沉积物而滞留。

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