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4. Plasticity of plant silicon and nitrogen concentrations in response to water regimes varies across temperate grassland species

Author

Klotz, Marius, Schaller, Jörg, Feldhaar, Heike, Dengler, Jürgen, Gebauer, Gerhard, Aas, Gregor, Weissflog, Anita, Engelbrecht, Bettina M. J., Klotz, Marius, Schaller, Jörg, Feldhaar, Heike, Dengler, Jürgen, Gebauer, Gerhard, Aas, Gregor, Weissflog, Anita, and Engelbrecht, Bettina M. J.

Abstract

1. Temperate grasslands exhibit strong spatial and temporal variation in water regimes. Thus, grassland plants experience potentially stressful water regimes, which may influence their tissue silicon (Si) and nitrogen (N) concentrations. Plant Si and N concentrations play important ecological roles in temperate grasslands, for example, by influencing plant performance and herbivory, yet comparisons of species' responses to a broad range of water regimes, including drought, waterlogging and flooding, are lacking. 2. We conducted a mesocosm experiment with 10 temperate grassland species of two life-forms (grasses and forbs) exposed to four different soil water regimes (drought, a benign control, waterlogged and flooded conditions), and analysed their Si and N concentrations. 3. Grasses showed lower Si concentrations under drought and flooding compared to the benign control and the highest concentrations emerged under waterlogging. Overall, plant Si responses of grasses were more uniform, while in forbs, responses varied both in direction and magnitude across species. For N concentrations, all species and life-forms showed the highest concentrations under drought compared to the benign control, while half of the species exhibited decreasing concentrations under waterlogging and/or flooding. The water regimes, especially waterlogging and flooding, induced changes in species rankings of plant Si and N concentrations, with stronger shifts in forbs than in grasses. 4. Our results indicate that spatial and temporal variation of water regimes may influence plant Si and N concentrations in temperate grassland species. Plant Si responses to water regimes might be highly species-specific in forbs but more similar in grasses, whereas plant N responses are likely to be relatively uniform across species and life-forms. 5. The strong plasticity in plant Si and N concentrations we observed might have pervasive consequences for ecological processes, such as herbivory.

Published
2023

6. Erläuterungen und Kommentare zu Neuerungen, Abweichungen von der Standardliste der Gefäßpflanzen Deutschlands sowie zu Gattungs- und Artkonzepten in der Rothmaler Exkursionsflora, Auflage 22

Author

Müller, Frank, Ritz, Christiane, Welk, Erik, Aas, Gregor, Dillenberger, Markus S., Gebauer, Sebastian, Kadereit, Joachim W., Kropf, Matthias, Peterson, Angela, Peterson, Jens, and Wesche, Karsten

Abstract

Müller F., Ritz, C. M., Welk, E., Aas, G., Dillenberger, M., Gebauer, S., Kadereit, J. W., Kropf, M., Peterson, A., Peterson, J. & Wesche, K. 2022: Erläuterungen und Kommentare zu Neuerungen, Abweichungen von der Standardliste der Gefäßpflanzen Deutschlands sowie zu Gattungs- und Artkonzepten in der Rothmaler Exkursionsflora, Auflage 22. Schlechtendalia 39: 180–219. Die 22. Auflage des Gundbandes der Rothmaler Exkursionsflora ist 2021 erschienen und der vorliegende Artikel gibt Kommentare und Hinweise zu vielen, vorwiegend größeren Neuerungen. Wir haben im Grundband nicht nur neue Taxa aufgenommen, sondern mit den Armleuchteralgen, den Characeae, auch erstmals eine Algengruppe verschlüsselt, die aber in vieler, insbesondere ökologisch-praktischer Hinsicht durchaus den Gefäßpflanzen ähnelt. Für alle Arten im Band wurden die biologischen Angaben durchgesehen; sofern Daten zu Akzessionen aus Deutschland verfügbar waren, wurde Chromosomenzahlen neu eingefügt. Die Angaben zur Verbreitung in Deutschland wurden basierend auf dem Deutschlandatlas neu zusammengestellt, wobei jetzt stärker naturräumliche als politische Verbreitungseinheiten genutzt wurden. Taxonomie und Nomenklatur im Grundband folgen weitgehend der Florenliste von Deutschland, Abweichungen werden hier diskutiert und ggf. begründet., Müller F., Ritz, C. M., Welk, E., Aas, G., Dillenberger, M., Gebauer, S., Kadereit, J. W., Kropf, M., Peterson, A., Peterson, J. & Wesche, K. 2022: Notes and comments on novel aspects, on deviations from the standard checklist of vascular plants of Germany, and on genus concepts and species concepts in the Rothmaler field flora, 22nd edition. Schlechtendalia 39: 180–219. The 22nd edition of the Rothmaler field flora was published in 2021, and the present article gives comments on the numerous, especial major changes. We added new species, and for the first time included an Algae group; the stoneworts, Characeae, which in many practical respects resemble vascular plants. For all species, biological data were revised, and chromosome numbers were added if available for accessions from Germany. Notes on distribution within Germany were completely restructured, employing new physico-geographical rather than political mapping units, and using data from the current distribution atlas of vascular plants in Germany. Taxonomy and nomenclature in the Rothmaler largely follow the standard checklist of vascular plants in Germany; deviations are explained and justified.

Published
2022
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