Journal Article

Can We Use Tree Rings of Black Alder to Reconstruct Lake Levels? A Case Study for the Mecklenburg Lake District, Northeastern Germany

van der Maaten, Ernst, Lorenz, Sebastian, van der Maaten-Theunissen, Marieke, Wilmking, Martin, Buras, Allan, Simard, Sonia, Kaiser, Knut, Scharnweber, Tobias

2015

Overview

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.

• Publisher: Public Library of Science,Public Library of Science (PLoS)
• Subject: Alnus glutinosa / Archaeology / Biological evolution / Black alder / Case reports / Case studies / Climate change / Dynamic tests / Ecosystems / Environmental assessment / Environmental conditions / Environmental research / Evapotranspiration / Evapotranspiration-precipitation relationships / Fluctuations / Gaging / Gauging / Germany / Groundwater / Groundwater level / Groundwater levels / Human influences / Hydrologic models / Hydrology / Ilex - growth & development / Lake levels / Lake shores / Lakes / Landscape ecology / Models, Statistical / National parks / Nature conservation / Observations / Physiological aspects / Precipitation / Rain / Rainfall / Reconstruction / Riparian environments / Riparian vegetation / Sediments / Statistical analysis / Tree rings / Water - metabolism / Water cycle / Wood