A diatom-inferred water-depth transfer function from a single lake in the northern California Coast Range
A diatom-inferred water-depth transfer function from a single lake in the northern California Coast Range
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DOI：
10.1007/s10933-023-00281-0
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发表时间：
2023-03
影响因子：
2.1
通讯作者：
Jiwoo Han;M. Kirby;J. Carlin;B. Nauman;Glen MacDonald
中科院分区：
文献类型：
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作者：
Jiwoo Han;M. Kirby;J. Carlin;B. Nauman;Glen MacDonald
本研究考察了加利福尼亚州凯利湖湖泊沉积物表面样品中水深与硅藻组合之间的关系。在5.7 m深的小湖（~ 3.74 ha）的不同深度，共采集了40个表层沉积物样本（上部5 cm）。还测量了潜深、水温、pH、盐度、电导率和总溶解固体。一些硅藻种类与深度有明显的相关性（如：碎藻、半罗布氏硅藻）。采用深度聚类分析、单向相似性分析、主成分分析和典型对应分析等方法，分析和评价了全硅藻组合与水深的关系。在浅水（0-1.25 m）、中水深（1.25-3.75 m）和深水（3.75-5.2 m）位置的组合之间存在统计学上的显著差异。利用现代模拟技术和加权平均偏最小二乘建立了硅藻群与湖深之间的迁移模型。通过残差散点图对这些模型进行比较和评价。结果表明，基于单个相对较小的浅湖表面沉积物样本的硅藻推断转移模型可以成为研究加利福尼亚和其他地区类似湖泊过去水文气候变化（例如湖泊深度）的有用工具，这些地区可能不存在传统转移功能发展所需的大量湖泊。
This study examines the relationship between water depth and diatom assemblages from lake-sediment-surface samples at Kelly Lake, California. A total of 40 surface-sediment samples (integrated upper 5 cm) were taken at various depths within the small (~ 3.74 ha) 5.7 m-deep lake. Secchi depths, water temperature, pH, salinity, conductivity, and total dissolved solids were also measured. Some diatom species showed distinct association with depth (e.g.,Fragilaria crotonensis, Nitzschia semirobusta). The relationship between the complete diatom assemblages and water depth was analyzed and assessed by depth-cluster analysis, a one-way analysis of similarity, principal components analysis and canonical correspondence analysis. Statistically significant differences were found between the assemblages associated with shallow depth (0–1.25 m), mid-depth (1.25–3.75 m), and deep-water (3.75–5.2 m) locations. The relationship between diatom assemblages and lake depth allowed two transfer models to be developed using the Modern Analogue Technique and Weighted Averaging Partial Least Squares. These models were compared and assessed by residual scatter plots. The results indicate that diatom-inferred transfer models based on surface-sediment samples from a single, relatively small and shallow lake can be a useful tool for studying past hydroclimatic variability (e.g., lake depth) from similar lakes in California and other regions where the large number of lakes required for traditional transfer-function development may not exist.