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Heurich, Marco & Mauch, Christof (Hrsg.) 2020: Urwald der Bayern. Geschichte, Politik und Natur im Nationalpark Bayerischer Wald. Rezension des Buchs

Ewald, J. (2021)

Berichte der Bayerischen Botanischen Gesellschaft 91, S. 311-313.

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Roloff, Andreas (Hrsg.) 2021: Trockenstress bei Bäumen. Ursachen, Strategien, Praxis. Rezension des Buchs

Ewald, J. (2021)

Berichte der Bayerischen Botanischen Gesellschaft 91, S. 325-327.

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Vollmuth, David Willi 2021: Die Nachhaltigkeit und der Mittelwald. Eine interdisziplinäre vegetationskundlich-forsthistorische Analyse oder: Die pflanzensoziologisch-naturschutzfachlichen Folgen von Mythen, Macht und Diffamierungen. Rezension des Buchs

Ewald, J. (2021)

Berichte der Bayerischen Botanischen Gesellschaft 91, S. 303-331.

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Wohlgemuth, Thomas, Jentsch, Antje & Seidl, Rupert (Hrsg.) 2019: Störungsökologie. Rezension des Buchs

Ewald, J. (2021)

Berichte der Bayerischen Botanischen Gesellschaft 91, S. 331-332.

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Neufund von Stipa calamagrostis Wahlenb. in der Freisinger Altstadt

Ewald, J. (2021)

Berichte der Bayerischen Botanischen Gesellschaft 91, S. 297-299.

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Der Bergwald - schutzbedürftiger Schutzwall

Medienbeitrag, .; Ewald, J. (2021)

BR Podcast, Bayern 2 (Radiowissen), Stand 18.11.2021.

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Ausbreitung von Ilex aquifolium als Beitrag zur Laurophyllisierung mitteleuropäischer Wälder?

Ewald, J. (2021)

LWF Wissen 85, S. 19-26.

 

Mit immergrünem, hartem Laub, geringer Trocken- und hoher Schattentoleranz ist Ilex aquifolium die frosttoleranteste unter den laurophyllen Baumarten des ozeanischen Europa, wo nur Relikte des arktotertiären Lorbeerwald-Bioms die Eiszeit überlebten.
Die im Tessin und in Irland als Laurophyllisierung beschriebene Unterwanderung warmtemperierter Eichenmischwälder mit exotischen Gartenflüchtlingen ist in Mitteleuropa trotz steigender Wintertemperaturen noch nicht feststellbar. Entlang der Randalpen gedeiht Ilex aus ungeklärten Gründen in Frosthärtezone 6 und erreicht seine östlichste Verbreitung nördlich der Alpen. Die an Hand von Klimaensembles für 2080 ermittelten Analoggebiete des niederschlagsreichen bayerischen Alpenrandes begünstigen laurophylle Vegetation, was eine Ausbreitung von Ilex und anderen immergrünen Gehölzen im Klimawandel erwarten lässt.

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Relationship of insect biomass and richness with land use along a climate gradient

Uhler, J.; Redlich, S.; Zhang, J.; Hothorn, T.; Tobisch, C.; Ewald, J.; Thorn, S....

Nature Communications 12, 5946.
DOI: 10.1038/s41467-021-26181-3


Open Access
 

Recently reported insect declines have raised both political and social concern. Although the declines have been attributed to land use and climate change, supporting evidence suffers from low taxonomic resolution, short time series, a focus on local scales, and the collinearity of the identified drivers. In this study, we conducted a systematic assessment of insect populations in southern Germany, which showed that differences in insect biomass and richness are highly context dependent. We found the largest difference in biomass between semi-natural and urban environments (−42%), whereas differences in total richness (−29%) and the richness of threatened species (−56%) were largest from semi-natural to agricultural environments. These results point to urbanization and agriculture as major drivers of decline. We also found that richness and biomass increase monotonously with increasing temperature, independent of habitat. The contrasting patterns of insect biomass and richness question the use of these indicators as mutual surrogates. Our study provides support for the implementation of more comprehensive measures aimed at habitat restoration in order to halt insect declines.

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Wie der Klimawandel den Bergwald verändert

Medienbeitrag, .; Ewald, J. (2021)

BR 24, Beitrag vom 12.10.2021.

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bayklif präsentiert sich auf den Münchener Wissenschaftstagen 8.-10. Oktober

Medienbeitrag, .; Ewald, J. (2021)

bayklif - Bayerisches Netzwerk für Klimaforschung, Beitrag vom 11.10.2021.

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Geführte Bergwanderungen mit der BAYSICS-App am 9. und 24. Oktober

Medienbeitrag, .; Ewald, J. (2021)

bayklif - Bayerisches Netzwerk für Klimaforschung, Beitrag vom 05.10.2021.

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Klimaforschung beim Wandern- mit der BAYSICS-App Baumgrenzen am Fellhorn selbst erfassen und mit historischen Daten vergleichen

Medienbeitrag, .; Ewald, J. (2021)

bayklif - Bayerisches Netzwerk für Klimaforschung, Beitrag vom 29.09.2021.

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Klimawandel: Bäume wachsen so hoch im Gebirge wie nie zuvor

Medienbeitrag, .; Ewald, J. (2021)

Allgäuer Anzeigeblatt, Beitrag vom 28.09.2021.

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The relevance of the concept of potential natural vegetation in the Anthropocene

Somodi, I.; Ewald, J.; Bede-Fazekas, Á.; Molnár, Z. (2021)

Plant Ecology & Diversity 14 (1-2), S. 13-22.
DOI: 10.1080/17550874.2021.1984600

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Coppicing and topsoil removal promote diversity of dung‐inhabiting beetles (Coleoptera: Scarabaeidae, Geotrupidae, Staphylinidae) in forests

Ambrožová, L.; Finnberg, S.; Felmann, B.; Buse, J.; Preuß, H.; Ewald, J.; Thorn, S. (2021)

Agricultural and Forest Entomology 24 (1), S. 104-113.
DOI: 10.1111/afe.12472


Open Access
 

  1. Central European forests experience a substantial loss of open-forest organisms due to forest management and increasing nitrogen deposition. However, management strategies, removing different levels of nitrogen, have been rarely evaluated simultaneously.
  2. We tested the additive effects of coppicing and topsoil removal on communities of dung-inhabiting beetles compared to closed forests. We sampled 57 021 beetles, using baited pitfall traps exposed on 27 plots.
  3. Experimental treatments resulted in significantly different communities by promoting open-habitat species. While alpha diversity did not differ among treatments, gamma diversity of Geotrupidae and Scarabaeidae and beta diversity of Staphylinidae were higher in coppice than in forest. Functional diversity of rove beetles was higher in both, coppice and topsoil-removed plots, compared to control plots. This was likely driven by higher habitat heterogeneity in established forest openings. Five dung beetle species and four rove beetle species benefitted from coppicing, one red-listed dung beetle and two rove beetle species benefitted from topsoil removal.
  4. Our results demonstrate that dung-inhabiting beetles related to open forest patches can be promoted by both, coppicing and additional topsoil removal. A mosaic of coppice and bare-soil-rich patches can hence promote landscape-level gamma diversity of dung and rove beetles within forests.

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Klimawandel: Pflanzen drängen zu den Gipfeln

Medienbeitrag, .; Ewald, J. (2021)

Allgäuer Anzeigeblatt, Beitrag vom 06.09.2021.

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Thick forest floors in the Calcareous Alps – Distribution, ecological functions and carbon storage potential

Olleck, M.; Kohlpaintner, M.; Mellert, K.; Reger, B.; Göttlein, A.; Ewald, J. (2021)

CATENA 207, 105664.
DOI: 10.1016/j.catena.2021.105664

 

The thickness and composition of forest floors plays an essential role for the efficiency and resilience of mountain forests to store carbon, water and nutrients. Up to now, the distribution of particularly thick organic forest floors (TOFF) in the Bavarian Calcareous Alps is poorly known and their ecosystem services deserve increased consideration under climate change. We wanted to improve the knowledge of the TOFF-distribution and to investigate the forcing processes and ecological functions of TOFF. We aimed to quantify their carbon storage potential and to model areas in which humus management is mandatory for sustainable forest use. We drew a stratified sample of soil profiles. Through the combination of relief and soil parameters, we identified crucial control variables and modelled actual and potential (without human disturbance) forest floor thickness in the Bavarian Calcareous Alps based on quantile regression and Generalized Additive Models (GAM). TOFF were predicted to occur on approximately 10% of the forest area of the Bavarian Alps. A decisive condition for the development of TOFF was the absence or only shallow development of mineral fine soil. Contrary to conventional wisdom, these TOFF were found across a wide range of (montane to subalpine) elevations. C-storage of TOFF amounts to ca. 6.9 t C/ha per cm of humus depth and ca. 5.2 Mt C in the study area, resulting in C accumulations comparable to peatlands. TOFF are decisive for the delivery of ecosystem services, especially in the protection forests of the Bavarian Calcareous Alps. Due to the absence or ephemeral depth of mineral soil, all ecological functions depend solely on the forest floor. Therefore, the careful handling of the humus stock is mandatory for a sustainable management in these forests.

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Climate and socio-economic factors explain differences between observed and expected naturalization patterns of European plants around the world

Pouteau, R.; Thuiller, W.; Hobohm, C.; Brunel, C.; Conn, B.; Dawson, W....

Global Ecology and Biogeography 30 (7), S. 1514-1531.
DOI: 10.1111/geb.13316

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Alien plant invasion hotspots and invasion debt in European woodlands

Wagner, V.; Vecera, M.; Jiménez-Alfaro, B.; Pergl, J.; Lenoir, J.; Svenning, J....

Journal of Vegetation Science 32, e13014 (2).
DOI: 10.1111/jvs.13014

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Almen in Zeiten des Klimawandels - Schutz der Artenvielfalt durch (Wieder-) Beweidung? Die Fallstudie Brunnenkopfalm im Ammergebirge

von Heßberg, A.; Jentsch, A.; Berauer, B.; Ewald, J.; Fütterer, S.; Görgen, A....

Naturschutz und Landschaftsplanung 53 (3), S. 28-36.
DOI: 10.1399/NuL.2021.03.02

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Prof. Dr. Jörg Ewald


Hochschule Weihenstephan-Triesdorf

Fakultät Wald und Forstwirtschaft
Hans-Carl-von-Carlowitz-Platz 3
85354 Freising

T +49 8161 71-5909
joerg.ewald[at]hswt.de

ORCID iD: 0000-0002-2758-9324