Diatom-based reconstruction of trophic status changes recorded in varved sediments of Lake Żabińskie (northeastern Poland), AD 1888-2010
Diatom-based reconstruction of trophic status changes recorded in varved sediments of Lake Żabińskie (northeastern Poland), AD 1888-2010
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DOI：
10.1515/ohs-2017-0001
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发表时间：
2017-03
影响因子：
0.9
通讯作者：
M. Witak;I. Hernández‐Almeida;M. Grosjean;W. Tylmann
中科院分区：
文献类型：
--
作者：
M. Witak;I. Hernández‐Almeida;M. Grosjean;W. Tylmann
摘要：我们研究了波兰北部 46 个湖泊表层沉积物中的硅藻组合，并开发了基于硅藻的传递函数来推断表湖总磷 (TP) 浓度。使用多变量排序技术（DCA、CCA）来识别主要环境梯度并评估环境参数对现代硅藻数据集中硅藻分布的影响。该传递函数是使用 PLS、WA 和 WA-PLS 模型开发的，并应用于公元 1888-2010 年扎宾斯基湖的 varved 沉积物岩心。年度解析的TP浓度定量重建表明，TP水平的数十年变化反映了当地的聚落历史、土地利用变化以及农业和旅游业的发展。直到 1920 年代末，TP 值最高的高营养级时期都有记录。 20世纪30-70年代，总磷普遍下降，富水区植物区系部分被少管硅藻类群和少中管硅藻类群所取代。重建的 TP 浓度从 20 世纪 70 年代开始增加。 20世纪50年代后，人们注意到TP值的强烈短期波动，并通过气象条件、水柱混合和湖泊养分循环之间的相互作用来解释。
Abstract We investigated diatom assemblages in surface sediments of 46 lakes in northern Poland and developed a diatom-based transfer function to infer epilimnetic total phosphorus (TP) concentrations. Multivariate ordination techniques (DCA, CCA) were used to identify major environmental gradients and to evaluate the effect of environmental parameters on the distribution of diatoms in the modern diatom dataset. The transfer function was developed using PLS, WA and WA-PLS models, and applied to a varved sediment core from Lake Żabińskie, AD 1888-2010. Annually-resolved quantitative reconstruction of TP concentrations shows that multidecadal changes in the TP level reflect the local settlement history, land-use changes and development of agriculture and tourism. The period of high trophic levels with maximum values of TP was documented until the late 1920s. In the 1930s-1970s period, TP generally decreased and eutraphentic flora was partly replaced by oligotraphentic and oligo-mesotraphentic diatom taxa. The reconstructed TP concentrations have started to increase from the 1970s. After the 1950s, strong short-term fluctuations of TP values were noted and explained by interactions between meteorological conditions, water column mixing and nutrient cycling in the lake.