Die chronologische Liste zeigt aktuelle Veröffentlichungen aus dem Forschungsbetrieb der Hochschule Weihenstephan-Triesdorf. Zuständig ist das Zentrum für Forschung und Wissenstransfer (ZFW).
8 Ergebnisse
Abu Said Md. Juel Miah,
Tariqul Islam,
Prof. Dr. Anja Faße,
Iffat Anjum,
KAM Morshed,
Mahmud Elahi Akhter,
Nayeem Sultana,
Md. Israt Rayhan
Managed Aquifer Recharge (MAR) sites suffer from the long-lasting problem of clogging. The causes of clogging are physical, biological, chemical and mechanical processes and their complex interaction, with physical clogging being recognised as the predominant process. The intrusion and deposition of particles during water recharge affect the hydraulic properties of the infiltration surface, resulting in a decline in the infiltration capacity of the site over the operating years. Cleaning operations are necessary to restore the original infiltration rates. For this purpose, assessing the risk of clogging can determine the site’s vulnerability and improve the scheme’s design. Numerical models are essential to replicate physical clogging processes and predict the decline in infiltration rates. So far, predictive tools for physical clogging assessment have been missing in MAR literature. Hence, the purpose of this study is to analyse and reorganise physical clogging models from applied engineering fields dealing with water infiltration in natural heterogeneous systems. The modelling approaches are illustrated, starting from the main assumptions and conceptualisation of the soil volume and intruding particles. The individual processes are untangled from the multiple studies and reorganised in a systematic comparison of mathematical equations relevant to MAR applications. The numerical models’ predictive power is evaluated for transferability, following limitations and recommendations for a process-based model applicable to surface spreading schemes. Finally, perspectives are given for clogging risk assessment at MAR sites from modelling and site characterisation. The predictive tool could assist decision-makers in planning the MAR site by implementing cost-effective strategies to lower the risk of physical clogging.
Based on a stratified sample of 179 plots spread across normal landscapes of Bavaria/Southeast Germany and equipped with Malaise traps, we related insect biomass, composition and richness (based on metabarcoding) to landsacpe metrics and plant species composition and richness using mixed linear models and variance partitioning. Compared to grasslands, arable fields and settlements, forest clearings had the highest insect biomass and richness. Plant species composition explained the major fraction of variance in arthropod composition, while land-cover composition was another important predictor. Habitat conditions as indicated by plant composition through Ellenberg-values appeared more relevant for arthropod composition than specific trophic plant-insect relationships. Across trophic levels, arthropod richness showed a strong positive relationship with the richness of plants indicating legally protected biotopes (although those had negligible area), and butterflies and red-listed arthropods were related to the richness of red-listed insects and butterflies. Biotope-indicator plant species were more important predictors for arthropod richness than the amount of surrounding semi-natural habitat or landscape configuration. Plant species richness was mainly driven by local land use, with total species richness being highest in settlements and biotope-indicator richness being highest in forests. The results highlight the importance of forests for the conservation of plants and arthropods as well as of preserving and restoring high-quality habitats in agricultural and urban areas.
Mehr
Kirsten Krüger,
Cornelius Senf,
Prof. Dr. Rupert Seidl
How "close-to-nature" are forest disturbance regimes in managed forests in Germany? (2023) Vortrag bei der GfÖ-Jahrestagung am 14. September 2023 an der Universität Leipzig .
Betreuung der Publikationsseiten
Gerhard Radlmayr
Referent für Wissenstransfer und Forschungskommunikation
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