Data from long-term experimental catchments are the foundation of hydrological sciences and are crucial for benchmarking process understanding, observing trends and natural cycles, and being prerequisites for testing predictive models. Integrated data sets which capture all compartments of our landscapes are particularly important in times of land use and climate change. Here, we present ecohydrological data measured at multiple spatial scales which allow differentiation of "blue"water fluxes (which maintain streamflow generation and groundwater recharge) and "green"water fluxes (which sustain vegetation growth). There are two particular unique aspects to this data set: (a) we measured water stable isotopes in the different landscape compartments (i.e. in precipitation, surface water, soil, groundwater, and plant water), and (b) we conducted this monitoring during the extreme drought of 2018 in central Europe. Stable water isotopes are so useful in hydrology as they provide "fingerprints"of the pathways water took when moving through a catchment. Thus, isotopes allow one to evaluate the dynamic relationships between water storage changes and fluxes, which is fundamental to understanding how catchments respond to hydroclimate perturbations or abrupt land use conversion. Second, as we provide the data until 2020, one can also investigate recovery of water stores and fluxes after extreme droughts. Last but not least, lowland headwaters are often understudied systems despite them providing important ecosystem services such as groundwater and drinking water provision and management for forestry and agriculture. The data are available at 10.18728/igb-fred-826.3 (Dämpfling, 2023).
We thank David Dubbert for support of the
liquid water isotope samples. We also thank our colleagues from
the Finck Foundation, Benedict Boesel and Max Kuester, for the
trustful collaboration and for providing access to the study sites.
We were funded by the Bundesministerium für Bildung und Forschung (BMBF – funding code 033W034A), which supported the stable isotope laboratory at IGB. Funding for Doerthe Tetzlaff was also received through the Einstein Research Unit “Climate and Water under Change” from the Einstein Foundation Berlin and Berlin University Alliance (grant no. ERU-2020-609).
Data Availability StatementAll data presented in this paper are available from the IGB
open-data repository FRED (https://doi.org/10.18728/igb-red-826.3; Dämpfling, 2023) under a Creative Commons Attribution 4.0 International Public License (CC BY 4.0) including detailed metadata and contact information for any