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Soil physicochemical properties of the PhytOakmeter plot DGRL_14 (Greifenhagen, Germany) in 2016, 2020 and 2022

As part of PhytOakmeter platform (www.phytoakmeter.de), soil chemical parameters were determined in 2016, 2020 and 2022. Soil pH was measured using a glass electrode in a 1:2.5 soil-to-0.01 M CaCl2 suspension after one hour of equilibration. Gravimetric soil moisture was assessed with a fully automated moisture analyzer (DBS60-3, KERN & SOHN GmbH, Balingen, Germany), here defined as soil moisture (MOI). Total nitrogen (TN) and total carbon (TC) contents in the soil were analyzed in triplicate through dry combustion using a Vario elemental analyzer (EL III, Elementar, Hanau, Germany), and the carbon-to-nitrogen ratio (TC/TN) was subsequently calculated from these values. To evaluate the potentially bioavailable soil organic carbon and nitrogen for microbial activity, hot water-extractable carbon and nitrogen (HWC and HWN, respectively) were determined following the methods of Ghani et al. (2003) and Schulz et al. (2011). Additionally, the labile organic carbon and nitrogen easily decomposable by soil microorganisms were measured as cold water-extractable carbon (CWC) and nitrogen (CWN) based on procedures described by Zsolnay (1996), Zakharova et al. (2015), and Schmidt et al. (2017). Ammonium and nitrate (NH4±N and NO3—N, respectively) were quantified, with their sum representing the total mineral nitrogen content (Nmin).

Water chemistry of Lagrangian samplings of Inland Elbe 2024 (MOSES Hydrological Extremes)

Within the framework of MOSES (Modular Observation Solutions for Earth Systems) and ElbeXtreme, we performed three longitudinal sampling campaigns in the Elbe catchment in 2024. The campaigns covered the German freshwater part, the tidal Elbe river, and the German Bight. Here we present the results of the freshwater river where the sampling was conducted in a Langrangian way according to flow velocity. Physico-chemical and biological parameters were measured along the Elbe from bridges between Bad Schandau (km 12, Czech-German border) and Lauenburg (km 570, close to Hamburg). A particular scientific focus was on (1) nutrients and eutrophication, (2) composition of dissolved organic matter measured by high-resolution mass spectrometry, (3) greenhouse gas measurements, and (4) micropollutants. This was done during a winter flood event in January, a summer drought in July, and a second smaller flood in September 2024.

Deskriptor 5 - Eutrophierung - Daten

Es handelt sich um eutrophierungsrelevante, überprüfte Daten von 2003 bis 2010.

Surface measurements of nutrients in the East Frisian Wadden Sea from 2019 to 2022

Phytoplankton biomass is increasing in the Wadden Sea since 2005, while nutrients concentrations are declining since 1995. A survey started in 2006 by the Lower Saxony Water Management, Coastal and Nature Protection Agency regularly monitors nutrient levels, including silicates, nitrate, and phosphate, and temperature and salinity in the East Frisian Wadden Sea. A total of 17 stations are sampled from a monthly to weekly frequency. Samples are taken at the surface with a bucket, and kept in 5L canisters with Lugol's iodine solution to be stored in the cold and dark until analysis. The analysis of samples followed the procedures for seawater analysis given by Grasshoff et al. 1983. Dissolved nutrients, such as orthophosphate, nitrate, nitrite and silicate, were measured photometrically. Total nitrogen and phosphorus concentration were estimated by digesting total nutrients using heat and pressure, or in microwave with peroxodisulfate. The pH, salinity, and temperature were measured using a multisensor. The data provides a detailed time series of physical and chemical properties in the East Frisian Wadden Sea surface waters from 2019 to 2022.

Fließgewässer – Nährstoffe und Salze (Datensatz)

Der Datensatz enthält die statistischen Kennzahlen (z.B. Mittelwert, Perzentile, Maximum) für etwa 250 Messstellen in Fließ- und Übergangsgewässern (LAWA Messstellennetz) sowie Angaben zu den Messstellen. Die Daten sind Grundlage für die Auswertungen der Applikation „Fließgewässer - Nährstoffe und Salze“ (siehe auf der rechten Seite unter "Download-Links").

Soil chemistry and soil bulk density data from restored grasslands and reference sites in Germany

This dataset provides information on soil chemistry and soil bulk density as part of the Grassworks project, which investigates the restoration of species-rich grasslands in Germany. Grasslands are globally threatened ecosystems, and the project aims to identify factors that contribute to successful restoration, focusing on ecological complexity and stakeholder engagement. Data was collected from 187 grassland sites across three regions in Northern, Central, and Southern Germany, each with distinct socio-economic and ecological characteristics. Sampling occurred between 2022 and 2023 and included 40–41 restored grassland sites and 20–25 reference sites (10–12 positive, 10–13 negative) per region. At each site in March or early April at each vegetation plot per subtransect, we took soil samples (pooled from six soil cores, 20 mm diameter) that were further pooled into one sample per site (24 in total) and analyzed for total soil organic carbon (SOC), total nitrogen content, pH, and soil texture. Additionally, soil bulk density was measured at vegetation plots per site, to enable future assessment of carbon sequestration over time. Soil and bulk density samples were taken at two depths: 0–10 and 10–30 cm.

WMS MSRL: D5-Eutrophierung (sh-llur)

Der WMS umfasst von Eutrophierung beeinflusste Parameter, die an Messstationen des LLUR erfasst werden. Parameter: Chlorophyll a, Nährstoffkonzentrationen, Sichttiefe, Makrophyten, Sauerstoffgehalt, Sauerstoffsättigungsindex und Stickstoffrachten aus den Flussgebietseinheiten.

Messstellen Nährstoffe

Auszug der Messstellen Chemie/Biologie für Nährstoffe in Fließgewässern: Datenzusammenstellung zu Nährstoffen der repräsentativen Fließgewässer-Messstellen, Jahresmittelwerten bis einschließlich 2023. Es werden Gesamt-P, Gesamt-N und ortho-Phosphat jeweils in 5 Kategorien dargestellt. Layer: - Jahresmittelkonzentration_gesamt_N (0) - Jahresmittelkonzentration_gesamt_Phosphor (1) - Jahresmittelkonzentration_gesamt_Orthophosphat (2) Attribute: GEWAESSER_ID, AB_ID, GEWAESSERNAME, STATION, MESSSTELLENNUMMER, MESSSTELLENNAME, WASSERKOERPER, WASSERKOERPERNAME, EINSTUFUNG, GEWAESSERTYPNAME, BEARBEITUNGSGEBIETSNUMMER, JAHR_MESSUNG, JAHRESMITTELKONZENTRATION_GESAMTN, KLASSEN_JAHRESMITTEL_GESAMTN, JAHRESMITTELKONZENTRATION_GESAMTP, KLASSEN_JAHRESMITTEL_GESAMTP, JAHRESMITTELKONZENTRATION_ORTHOP, KLASSEN_JAHRESMITTEL_ORTHOP, JAHRESMITTELKONZENTRATION_NITRAT, JAHRESMITTELKONZENTRATION_AMM

Fließgewässer – Nährstoffe und Salze (Applikation)

Die hier dargestellten Karten zeigen die Auswertungen für etwa 250 Messstellen in Deutschlands Flüssen (LAWA Messstellennetz). Grundlage für die Einstufung in die Klassen sind die rechtlich vorgegebenen Hintergrundwerte und Orientierungswerte (Zielwerte), die in der Oberflächengewässerverordnung festgeschrieben sind. Durch Auswahl der Messstelle werden in einem Fenster die Informationen zur Messstelle und ein Diagramm der Jahresmittelwerte angezeigt. Für Nitrat wird der 90-Perzentil verwendet. Die Datengrundlage steht als Download (siehe Link unter Info-Links) zur Verfügung.

Surface water parameters (pH, specific conductivity, salinity, nutrients, oxygen, sulfate and chloride concentrations, DOC/DIC) (Table 4)

Surface water parameters were measured in parallel to the gas measurements and soil coring for microbial analyses. Most surface water variables (pH, specific conductivity, salinity, nutrients, oxygen, sulfate and chloride concentrations, DOC/DIC) were measured in-situ using a multiparameter digital water quality meter or taken to the laboratory as water samples for further analysis. While surface water analysis was only conducted in the drainage ditch before rewetting, it was done along the entire transect after rewetting.

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