Details zur Publikation |
| Kategorie | Textpublikation |
| Referenztyp | Qualifizierungsarbeiten |
| Titel (primär) | Determining potential denitrification rates as an ecosystem function in floodplains |
| Autor | Kaden, U.S.
|
| Erscheinungsjahr | 2024 |
| Department | NSF |
| Seite bis | 86, xii |
| Sprache | englisch |
| Topic | T5 Future Landscapes |
| Abstract | Due to the persistent problem of excess nitrogen (N) in aquatic ecosystems, this research focuses on understanding and quantifying potential denitrification in floodplain soils. The denitrification potential of six floodplains along four large German rivers, and the influence of hydrological and soil parameters were analyzed. These results were then used to improve an existing N removal approach. Initially, time series analyses of rewetting were carried out to further develop the acetylene inhibition technique to measure denitrification on air-dried soil samples, enabling large-scale campaigns, as samples can be stored dry. An overall rewetting duration of at least seven days was found to be optimal. Building on this, investigations were extended to the floodplain scale through a combined assessment of potential soil denitrification rates, physical and chemical soil parameters, and hydrological parameters. Soil pH was found to be the most important factor influencing potential soil denitrification rates, with greater potential observed in soils with pH > 7. Upscaling these estimates to potential floodplain denitrification capacities, by incorporating modeled average inundation duration, was another critical factor in estimating potential annual denitrification rates. Finally, these model- and measurement-based data improve the existing proxies of a German-wide proxy- based approach (PBA) on N retention in floodplains. The improved PBA developed enables a more differentiated spatial quantification of potential denitrification rates as local key controlling parameters are included. Upscaling the new proxies to the entire active floodplains of the rivers Elbe and Rhine supports the need for available land as the primary objective of restoration efforts. The procedure results in an innovative and robust PBA to quantify potential denitrification rates in floodplain soils that support the assessment of ecosystem functions for decision-making on floodplain restoration. |
| dauerhafte UFZ-Verlinkung | https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=30655 |
| Kaden, U.S. (2024): Determining potential denitrification rates as an ecosystem function in floodplains Dissertation, Universität für Bodenkultur 86, xii pp. |
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