ORCID Profile
0000-0002-7183-8674
Current Organisations
University of Aberdeen
,
Leibniz-Institut für Gewässerökologie und Binnenfischerei
,
Humboldt University of Berlin
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Publisher: Springer Science and Business Media LLC
Date: 11-10-2016
Publisher: Elsevier BV
Date: 08-2020
Publisher: Copernicus GmbH
Date: 23-07-2020
DOI: 10.5194/HESS-24-3737-2020
Abstract: Abstract. In drought-sensitive lowland catchments, ecohydrological feedbacks to climatic anomalies can give valuable insights into ecosystem functioning in the context of alarming climate change projections. However, the dynamic influences of vegetation on spatio-temporal processes in water cycling in the critical zone of catchments are not yet fully understood. We used water stable isotopes to investigate the impacts of the 2018 drought on dominant soil–vegetation units of the mixed land use Demnitz Millcreek (DMC, north-eastern Germany) catchment (66 km2). The isotope s ling was carried out in conjunction with hydroclimatic, soil, groundwater, and vegetation monitoring. Drying soils, falling groundwater levels, cessation of streamflow, and reduced crop yields demonstrated the failure of catchment water storage to support “blue” (groundwater recharge and stream discharge) and “green” (evapotranspiration) water fluxes. We further conducted monthly bulk soil water isotope s ling to assess the spatio-temporal dynamics of water soil storage under forest and grassland vegetation. Forest soils were drier than the grassland, mainly due to higher interception and transpiration losses. However, the forest soils also had more freely draining shallow layers and were dominated by rapid young (age months) water fluxes after rainfall events. The grassland soils were more retentive and dominated by older water (age months), though the lack of deep percolation produced water ages year under forest. We found the displacement of any “drought signal” within the soil profile limited to the isotopic signatures and no displacement or “memory effect” in d-excess over the monthly time step, indicating rapid mixing of new rainfall. Our findings suggest that contrasting soil–vegetation communities have distinct impacts on ecohydrological partitioning and water ages in the sub-surface. Such insights will be invaluable for developing sustainable land management strategies appropriate to water availability and building resilience to climate change.
Publisher: Wiley
Date: 26-10-2017
DOI: 10.1002/HYP.11363
Publisher: Wiley
Date: 03-07-2019
DOI: 10.1002/ECO.2125
Publisher: Wiley
Date: 07-2021
DOI: 10.1002/HYP.14267
Publisher: Informa UK Limited
Date: 14-06-2013
Publisher: Elsevier BV
Date: 04-2017
Publisher: Elsevier BV
Date: 06-2017
Publisher: IOP Publishing
Date: 27-02-2018
Publisher: American Geophysical Union (AGU)
Date: 11-2016
DOI: 10.1002/2016JG003387
Publisher: Copernicus GmbH
Date: 28-02-2020
DOI: 10.5194/HESS-2020-81
Abstract: Abstract. In drought sensitive lowland catchments, ecohydrological feedbacks to climatic anomalies can give valuable insights into ecosystem functioning in the context of alarming climate change projections. However, the dynamic influences of vegetation on spatio-temporal processes in water cycling in the critical zone of catchments are not yet fully understood. We used stable isotopes to investigate the impacts of the 2018 drought on dominant soil-vegetation units of the mixed land-use Demnitzer Mill Creek (DMC, NE Germany) catchment (66 km²). The isotope s ling was carried out in conjunction with hydroclimatic, soil, groundwater, and vegetation monitoring. Drying soils, falling groundwater levels, cessation of stream flow and reduced crop yields demonstrated the failure of catchment water storage to support blue and green water fluxes. We further conducted monthly bulk soil water isotope s ling to assess the spatio-temporal dynamics of water soil storage under forest and grassland vegetation. Forest soils were drier than the grassland mainly due to higher interception and transpiration losses. However, the forest soils also had more freely draining shallow layers, and were dominated by rapid young (age 2 months), though the lack of deep percolation produced water ages ~ 1 year under forest. We found the displacement of any drought signal within the soil profile limited to the isotopic signatures and no displacement or memory effect in d-excess over the monthly time step, indicating rapid mixing of new rainfall. Our findings suggest that contrasting soil-vegetation assemblages communities have distinct impacts on ecohydrological partitioning and water ages in the sub surface. Such insights will be invaluable for developing sustainable land management strategies appropriate to water availability and build resilience to climate change.
Publisher: Springer Science and Business Media LLC
Date: 19-08-2015
Publisher: Elsevier BV
Date: 08-2018
Publisher: Elsevier BV
Date: 03-2019
DOI: 10.1016/J.SCITOTENV.2018.11.361
Abstract: We assessed the hydrological implications of climate effects on vegetation phenology in northern environments by fusion of data from remote-sensing and local catchment monitoring. Studies using satellite data have shown earlier and later dates for the start (SOS) and end of growing seasons (EOS), respectively, in the Northern Hemisphere over the last 3 decades. However, estimates of the change greatly depend on the satellite data utilized. Validation with experimental data on climate-vegetation-hydrology interactions requires long-term observations of multiple variables which are rare and usually restricted to small catchments. In this study, we used two NDVI (normalized difference vegetation index) products (at ~25 & 0.5 km spatial resolutions) to infer SOS and EOS for six northern catchments, and then investigated the likely climate impacts on phenology change and consequent effects on catchment water yield, using both assimilated data (GLDAS: global land data assimilation system) and direct catchment observations. The major findings are: (1) The assimilated air temperature compared well with catchment observations (regression slopes and R
Publisher: Elsevier BV
Date: 03-2018
Location: United Kingdom of Great Britain and Northern Ireland
Location: Germany
No related grants have been discovered for Doerthe Tetzlaff.