Omnipresent distribution of herbicides and their transformation products in all water body types of an agricultural landscape in the North German Lowland

Ulrich, Uta; Pfannerstill, Matthias; Ostendorp, Guido; Fohrer, Nicola

doi:10.1007/s11356-021-13626-x

Cited by 15 publications

(10 citation statements)

References 46 publications

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“…The same input data was used for all three model setups: a DEM derived from LiDAR data with a spatial resolution of 5 m (LVermA, 2006), a soil map with a scale of 1:200 000 (BGR, 1999), and a land use map that was mapped during field surveys in April 2016 (Lei et al, 2019; Ulrich et al, 2021). Weather data from DWD weather stations outside the catchment (DWD, 2017) was used for deriving the inputs minimum and maximum temperatures, solar radiation, relative humidity, and wind speed.…”

Section: Methodsmentioning

confidence: 99%

“…Topography (LVermA, 2006), soil map (BGR, 1999) with drained areas (Fohrer et al, 2007), and land use map from 2016 (Lei et al, 2019; Ulrich et al, 2021) of the Kielstau catchment as well as the river network, river gauge, and rain gauge used for modelling.…”

Section: Methodsmentioning

confidence: 99%

“…LATQ_CO is a linear coefficient applied to the hillslope storage equation that is used to calculate lateral flow for each soil layer. (LVermA, 2006), soil map (BGR, 1999) with drained areas (Fohrer et al, 2007), and land use map from 2016 (Lei et al, 2019;Ulrich et al, 2021) of the Kielstau catchment as well as the river network, river gauge, and rain gauge used for modelling.…”

Section: Model Parameterization Calibration and Validationmentioning

confidence: 99%

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Representation of hydrological processes in a rural lowland catchment in Northern Germany usingSWATandSWAT+

Wagner

Bieger

Arnold

et al. 2022

Hydrological Processes

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The latest version of the Soil and Water Assessment Tool (SWAT+) features several improvements compared with previous versions of the model, for example, the definition of landscape units that allow for a better representation of spatio‐temporal dynamics. To evaluate the new model capabilities in lowland catchments characterized by near‐surface groundwater tables and extensive tile drainage, we assess the performance of two SWAT+ model setups in comparison to a setup based on a previous SWAT model version (SWAT3S with a modified three groundwater storage model) in the Kielstau catchment in Northern Germany. The Kielstau catchment has an area of about 50 km2, is dominated by agricultural land use, and has been thoroughly monitored since 2005. In both SWAT+ setups, the catchment is divided into upland areas and floodplains, but in the first SWAT+ model setup, runoff from the hydrologic response units is summed up at landscape unit level and added directly to the stream. In the second SWAT+ model setup, runoff is routed across the landscape before it reaches the streams. Model results are compared with regard to (i) model performance for stream flow at the outlet of the catchment and (ii) aggregated as well as temporally and spatially distributed water balance components. All three model setups show a very good performance at the catchment outlet. In comparison to a previous version of the SWAT model that produced more groundwater flow, the SWAT+ model produced more tile drainage flow and surface runoff. Results from the new SWAT+ model confirm that the representation of routing processes from uplands to floodplains in the model further improved the representation of hydrological processes. Particularly, the stronger spatial heterogeneity that can be related to characteristics of the landscape, is very promising for a better understanding and model representation of hydrological fluxes in lowland areas. The outcomes of this study are expected to further prove the applicability of SWAT+ and provide useful information for future model development.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Model Parameterization Calibration and Validationmentioning

confidence: 99%

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Representation of hydrological processes in a rural lowland catchment in Northern Germany usingSWATandSWAT+

Wagner

Bieger

Arnold

et al. 2022

Hydrological Processes

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“…Nevertheless, there is a lack of knowledge about hydrological dynamics in LSWB and the relevance of individual in‐ and outflow pathways (Ulrich et al, 2021; Vyse et al, 2020). Particularly for a deeper insight into the transport of pollutants from surrounding agricultural lands like pesticides or nutrients, it is important to identify and quantify water flows.…”

Section: Introductionmentioning

confidence: 99%

A multi‐method approach for the identification and quantification of water balance components of two lentic small water bodies

Loose,

Lange,

Budde

et al. 2024

Hydrological Processes

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The protection of the globally widespread lentic small water bodies (LSWB) must be based on detailed knowledge about their hydrological connectivity and water balance. The study aimed to identify and quantify water balance components as well as surface‐groundwater interaction of two LSWB in a characteristic lowland region with a combination of different methods. This includes the collection of hydrological data and the use of bromide and water stable isotopes (δ2H and δ18O) as tracers. With their help, mixing models were established, and daily water balances were assessed. The results show a strong bidirectional interaction of both LSWB systems with shallow groundwater. Bromide and stable isotope tracers allowed for the identification of the most relevant in‐ and outflow sources and pathways. Thereby, isotope data revealed isotopic enrichment typical for open‐water bodies and only minor precipitation inputs mainly relevant at the end of the dry season. Water balance calculations suggested accentuated seasonal dynamics that were strongly influenced by shallow groundwater, which represented large inputs into both LSWB. By that, different phases could be identified, with high inflow rates in winter and spring and decreasing fluxes in summer. In one LSWB, a drainage system was found to have a major impact next to the shallow groundwater interaction. The findings of this research provide detailed insights into the influence and importance of shallow groundwater for LSWB in lowland regions. This impacts the diffuse input of agricultural pollutants into these ecologically important landscape features.

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“…Common herbicides used worldwide are, for example, metazachlor (Met) and flufenacet (Flu) (Carpio et al, 2020; Maršík et al, 2021; Ulrich, Lorenz, et al, 2021; Willkommen et al, 2019). Following application, diffuse inputs of herbicides to non‐target areas occur unavoidably (Chow et al, 2020; de Souza et al, 2020; Mohaupt et al, 2020; Ulrich, Pfannerstill, et al, 2021), and herbicides can exert adverse effects on non‐target organisms such as crustaceans, fish and algae (De Brito Rodrigues et al, 2017; Spycher et al, 2018; Wijewardene, Wu, Qu, et al, 2021). On a community level, macrophytes, phytoplankton and bacteria form metaorganism‐like synergies by mutual nutrient supply (Kazamia et al, 2016), hence, shifts in macrophytes due to herbicide contamination may be followed by microbiome changes.…”

Section: Introductionmentioning

confidence: 99%

Selection of aquatic microbiota exposed to the herbicides flufenacet and metazachlor

Wijewardene,

Schwenker,

Friedrichsen

et al. 2023

Environmental Microbiology

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Herbicides are important, ubiquitous environmental contaminants, but little is known about their interaction with bacterial aquatic communities. Here, we sampled a protected natural freshwater habitat and characterised its microbiome in interaction with herbicides. We evolved the freshwater microbiomes in a microcosm assay of exposure (28 days) to flufenacet and metazachlor at environmental concentrations of 0.5, 5 and 50 μg L−1. Inhibitory effects of herbicides were exemplarily assessed in cultured bacteria from the same pond (Pseudomonas alcaligenes, Paenibacillus amylolyticus and Microbacterium hominis). Findings were compared to long‐term concentrations as provided by local authorities. Here, environmental concentrations reached up to 11 μg L−1 (flufenacet) and 76 μg L−1 (metazachlor). Bacteria were inhibited at minimum inhibitory concentrations far above these values; however, concentrations of 50 μg L−1 of flufenacet resulted in measurable growth impairment. While most herbicide‐exposed microcosm assays did not differ from controls, Acidobacteria were selected at high environmental concentrations of herbicides. Alpha‐diversity (e.g., taxonomic richness on phylum level) was reduced when aquatic microbiomes were exposed to 50 μg metazachlor or flufenacet. One environmental strain of P. alcaligenes showed resistance to high concentrations of flufenacet (50 g L−1). In total, this study reveals that ecologic imbalance due to herbicide use significantly impacts aquatic microbiomes.

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Omnipresent distribution of herbicides and their transformation products in all water body types of an agricultural landscape in the North German Lowland

Cited by 15 publications

References 46 publications

Representation of hydrological processes in a rural lowland catchment in Northern Germany usingSWATandSWAT+

Representation of hydrological processes in a rural lowland catchment in Northern Germany usingSWATandSWAT+

A multi‐method approach for the identification and quantification of water balance components of two lentic small water bodies

Selection of aquatic microbiota exposed to the herbicides flufenacet and metazachlor

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