title: Can We Use Tree Rings of Black Alder to Reconstruct Lake Levels? A Case Study for the Mecklenburg Lake District, Northeastern Germany.
abstract: In this study, we explore the potential to reconstruct lake-level (and groundwater) fluctuations from tree-ring chronologies of black alder (Alnus glutinosa L.) for three study lakes in the Mecklenburg Lake District, northeastern Germany. As gauging records for lakes in this region are generally short, long-term reconstructions of lake-level fluctuations could provide valuable information on past hydrological conditions, which, in turn, are useful to assess dynamics of climate and landscape evolution. We selected black alder as our study species as alder typically thrives as riparian vegetation along lakeshores. For the study lakes, we tested whether a regional signal in lake-level fluctuations and in the growth of alder exists that could be used for long-term regional hydrological reconstructions, but found that local (i.e. site-specific) signals in lake level and tree-ring chronologies prevailed. Hence, we built lake/groundwater-level reconstruction models for the three study lakes individually. Two sets of models were considered based on (1) local tree-ring series of black alder, and (2) site-specific Standardized Precipitation Evapotranspiration Indices (SPEI). Although the SPEI-based models performed statistically well, we critically reflect on the reliability of these reconstructions, as SPEI cannot account for human influence. Tree-ring based reconstruction models, on the other hand, performed poor. Combined, our results suggest that, for our study area, long-term regional reconstructions of lake-level fluctuations that consider both recent and ancient (e.g., archaeological) wood of black alder seem extremely challenging, if not impossible.
authors: Institute of Botany and Landscape Ecology, University of Greifswald, Greifswald, Germany.
authors: Ernst
authors: E
authors: van der Maaten
authors: Institute of Botany and Landscape Ecology, University of Greifswald, Greifswald, Germany.
authors: Marieke
authors: M
authors: van der Maaten-Theunissen
authors: Institute of Botany and Landscape Ecology, University of Greifswald, Greifswald, Germany.
authors: Allan
authors: A
authors: Buras
authors: Institute of Botany and Landscape Ecology, University of Greifswald, Greifswald, Germany.
authors: Tobias
authors: T
authors: Scharnweber
authors: Climate Dynamics and Landscape Evolution, GFZ German Research Centre for Geosciences, Potsdam, Germany.
authors: Sonia
authors: S
authors: Simard
authors: Staff Scientific Executive Board, GFZ German Research Centre for Geosciences, Potsdam, Germany.
authors: Knut
authors: K
authors: Kaiser
authors: Institute of Geography and Geology, University of Greifswald, Greifswald, Germany.
authors: Sebastian
authors: S
authors: Lorenz
authors: Institute of Botany and Landscape Ecology, University of Greifswald, Greifswald, Germany.
authors: Martin
authors: M
authors: Wilmking
mesh_terms: D005858:Germany; D030017:Ilex / Q000254:growth & development*; D060106:Lakes; D015233:Models, Statistical; D011891:Rain; D014867:Water / Q000378:metabolism*
chemical_list: D014867:Water