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首页> 外文期刊>Estuarine Coastal and Shelf Science >Variations in the release of silicate and orthophosphate along a salinity gradient: Do sediment composition and physical forcing have roles?
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Variations in the release of silicate and orthophosphate along a salinity gradient: Do sediment composition and physical forcing have roles?

机译：硅酸盐和正磷酸盐沿盐度梯度的释放变化：沉积物成分和物理强迫是否起作用？

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It was hypothesized that sediment composition, i.e. organic matters and minerals, and physical forcing can influence retention and release of silicate (SiO4) and orthophosphate (o-PO4) along salinity gradients. An experiment was performed to measure nutrient release by using treatments with and without sediment organic matter from the Guadalupe and Nueces Estuaries at five different salinities. The sample mixtures were shaken at intervals over the course of 48 h to simulate wind and river forcing. The release of silicate from sediments increased with time from 2 min to 48 h in all five salinities. The added orthophosphate concentration was adsorbed in most of the sediment containing organic matter and calcium-rich shells from both estuaries. From the sediments without organic matter, the release of orthophosphate was as high as 52 mu mol/L. The sediment minerals quartz and calcite were abundant in both estuaries. The average quartz to corundum peak intensities ratio were 14.04 and 13.36 and the average calcite to corundum peak intensities ratio were 3.06 and 1.32 in the Guadalupe and Nueces Estuaries respectively. The average organic matter in the Guadalupe and Nueces estuaries were 10.67% and 13.39% respectively. The retention and release of orthophosphate from the sediments may have been caused by the bonding with organic matter and calcite in the sediments. These findings indicate that sediment composition was a significant contributor in the low dissolved orthophosphate concentration in the estuaries. The release of silicate from the sediments containing quartz, and organic matter, when shaken, indicate that the combined forcing of river and wind may have been maintaining the estuaries silicate concentrations. (C) 2015 Elsevier Ltd. All rights reserved.
机译：据推测，沉积物成分，即有机物和矿物质，以及物理强迫会影响沿盐度梯度的硅酸盐（SiO4）和正磷酸盐（o-PO4）的保留和释放。进行了一项实验，通过使用有和没有来自瓜达卢佩河和Nueces河口的沉积物有机物在五种不同盐度下的处理来测量养分释放。在48小时的间隔内，将样品混合物摇晃以模拟风和河的强迫。在所有五个盐度中，硅酸盐从沉积物中的释放随时间从2分钟增加到48小时。增加的正磷酸盐浓度吸附在两个河口的大多数含有有机物和富含钙的贝壳的沉积物中。从不含有机物的沉积物中，正磷酸盐的释放高达52μmol / L。两个河口的沉积矿物石英和方解石都丰富。瓜达卢佩河口和Nueces河口的平均石英与刚玉峰强度比分别为14.04和13.36，方解石与刚玉峰平均强度比分别为3.06和1.32。瓜达卢佩河口和Nueces河口的平均有机物分别为10.67％和13.39％。正磷酸盐从沉积物中的保留和释放可能是由于与沉积物中有机物和方解石的键合所致。这些发现表明，沉积物成分是河口低溶解正磷酸盐浓度的重要因素。摇动时，含石英和有机物的沉积物中的硅酸盐释放表明，河和风的共同作用可能一直保持着河口硅酸盐的浓度。 （C）2015 Elsevier Ltd.保留所有权利。

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