A multivariate assessment of metal distribution in inter-tidal sediments of the Blackwater Estuary, UK
A multivariate assessment of metal distribution in inter-tidal sediments of the Blackwater Estuary, UK
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DOI：
10.1016/s0025-326x(97)00067-2
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发表时间：
1997-11-01
影响因子：
5.8
通讯作者：
Lester, JN
中科院分区：
文献类型：
--
作者：
Emmerson, RHC;O'Reilly-Wiese, SB;Lester, JN
回水河口，埃塞克斯，英国是管理撤退的调查的主要网站：海岸管理技术，旨在恢复盐沼，管理撤退试验的成功将判断健康盐沼社区的发展。沉积物的加积是这一发展的关键部分，加积沉积物的金属含量可能是显着的盐沼发展，具有环境的重要性，因此，在黑水河口河口沉积物地球化学的信息将是有价值的地球化学发展的解释管理撤退网站。本文应用多元统计技术--聚类分析、多维标度、主成分分析、多元线性回归分析、多元回归典型变量判别分析表明，河口区重金属含量总体上由陆向海呈下降趋势，这是重金属含量升高的结果，特别是Pb，Zn，Cd和Cu，在河口的头部造成特定的排放与聚集在这个区域的人类活动。相比之下，沉积物在较低的河口，其中管理撤退计划已经煽动，污染较少。然而，重金属浓度升高，鲍尔河口在一个网站的增强沉积，这是接近本地化的金属源，这有影响的金属浓度纳入沉积物中的管理撤退网站在河口下游的增生正在积极推动。与整个河口的泥滩相比，在盐沼中观察到钙的消耗，（C）1997 Elsevier Science Ltd.
The Backwater Estuary, Essex, UK is the primary site for the investigation of Managed Retreat: a coastal management technique aimed at the restoration of salt marshes, The success of Managed Retreat trials will be judged by the development of healthy salt marsh communities. Accretion of sediments is a key part of this development, The metal content of accreting sediments may be significant in salt marsh development and has environmental importance, Therefore, information on estuarine sediment geochemistry in the Blackwater Estuary will be valuable in interpretation of the geochemical development of Managed Retreat sites. The spatial distribution of 15 metals in the sediments of the estuary has been assessed by the use of the multivaraite statistical techniques cluster analysis; multidimensional scaling; principal component analysis; and canonical variate discriminant analysis, The assessment indicated a general landward to seaward decrease in heavy metal concentrations in the estuary, This was the effect of elevated concentrations of heavy metals, particularly Pb, Zn, Cd and Cu, at the head of the estuary resulting from specific discharges associated with the congregation of anthropogenic activity in this zone. In comparison, sediments in the lower estuary, where Managed Retreat schemes have been instigated, were less contaminated. However, heavy metal concentrations were elevated in the Bower estuary at a site of enhanced deposition, which was proximal to a localized source of metals, This has implications for concentrations of metals incorporated into sediments at Managed Retreat sites in the lower estuary where accretion is being actively promoted. a depletion of calcium was observed in salt marshes as compared to mudflats throughout the estuary, (C) 1997 Elsevier Science Ltd.