Variability of sediment diatom assemblages in an upland, wind-stressed lake (Loch Fleet, Galloway, S.W. Scotland)
Variability of sediment diatom assemblages in an upland, wind-stressed lake (Loch Fleet, Galloway, S.W. Scotland)
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高地、受风影响的湖泊中沉积物硅藻组合的变化（Loch Fleet，加洛韦，苏格兰西南）
DOI：
10.1007/bf00208298
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发表时间：
1990
影响因子：
2.1
通讯作者：
N. Anderson
中科院分区：
文献类型：
--
作者：
N. Anderson
在一个酸化的高地风胁迫湖泊（洛赫弗利特湖，加洛韦，S。W.苏格兰）通过分析28个表层沉积物样品和11个岩心进行了评估。对应分析（CA）和聚类分析被用来说明表层沉积物和岩心样品的变异性。在大多数表层沉积物样品中，有合理的均匀性的类群，虽然7个样品，CA和聚类分析表明，是非典型的。大多数核心清楚地记录了湖泊的酸化，虽然个别类群的百分比变化高达20%的核心之间。两个核心有老，预酸化硅藻组合（年龄不确定）接近沉积物表面。这些古老的沉积物可能是在非典型表层沉积物组合中发现的重新加工的硅藻的来源。硅藻的趋势，CA排序和pH值配置文件，比表面沉积物组合的变化。有人认为，不均匀的沉积物积累速率和硅藻沉积造成的变化，表层沉积物硅藻样品。在进一步的再悬浮/沉积循环和埋藏过程中，通过均质化可以减少岩心剖面的这种变化。岩心及其提供的相关时间成分可能有助于评估表层沉积物组合的变异性。
The variability of diatom distribution in an acidified, upland wind-stressed lake (Loch Fleet, Galloway, S. W. Scotland) was assessed by analysis of 28 surface sediment samples and 11 cores. Correspondence analysis (CA) and cluster analysis were used to illustrate the variability of the surface sediment and core samples. There was reasonable uniformity of taxa in most of the surface sediment samples, although 7 samples, as indicated by both CA and cluster analyses were atypical. Most cores recorded clearly the acidification of the lake, although percentages of individual taxa varied up to 20% between cores. Two cores had old, preacidification diatom assemblages (of indeterminate age) close to the sediment surface. These old sediments were probably the source of the re-worked diatoms found in the atypical surface sediment assemblages. Diatom trends, as CA ordinations and pH profiles, were less variable than the surface sediment assemblages. It is argued that non-uniform sediment accumulation rates and diatom deposition cause variability in surface sediment diatom samples. This variability may be reduced in core profiles by homogenization during further resuspension/deposition cycles and burial. Cores, and the associated time component they offer, may be useful in assessing the variability of surface sediment assemblages.