Reed bed vegetation structure and plant species diversity depend on management type and the time period since last management

Line Holm Andersen*, Petri Nummi, Simon Bahrndorff, Cino Pertoldi, Kristian Trøjelsgaard, Torben Linding Lauridsen, Jeppe Rafn, Cecilie Majgaard Skak Frederiksen, Mads Prengel Kristjansen, Dan Bruhn

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Abstract

Question: Reed beds, dominated by common reed (Phragmites australis), have high ecological value. Several studies have examined the differences between managed and unmanaged reed beds without taking into account the time passed since the last management. In this paper, we seek to answer the question: how does the time passed since last management and the management method itself affect the plant community and the habitat structure of reed beds?. Location: “De Østlige Vejler,” Northern Jutland, Denmark. Methods: We examined four reed bed treatments — beds either cut or harvested during the year of the study (0-year-old reed beds) and reed beds harvested 3 and 25 years ago, respectively. The reed bed plant communities and the reed bed habitat structure were determined in May and August. We tested the data for overall between-treatment differences (multivariate analysis of variance [MANOVA] and principal components analysis [PCA]) and specific differences in the plant community and habitat structure (Kruskal–Wallis). Results: The plant community differed significantly between the four reed beds according to treatment, and each reed bed exhibited unique species. Species richness was significantly higher in the recently harvested reed beds (0 and 3 years since harvest) compared with the 25-year-old reed beds. Harvest sparked reed rejuvenation and increased the growth of new reeds. The 3-year-old reed bed had a habitat structure that equally resembled that of the newly harvested (e.g., similar green reed shoot density) and the 25-year-old reed beds (e.g., similar height). Cutting, as opposed to harvesting, created a plant community adapted to less light availability. Conclusions: To secure most plant species and most variation in habitat structure, reed beds should contain a mosaic of differently aged and differently managed patches. Previous studies have disagreed on the effect of management on plant species diversity, which could be explained either by different reed bed age or different sampling periods.

OriginalsprogEngelsk
Artikelnummere12531
TidsskriftApplied Vegetation Science
Vol/bind24
Udgave nummer1
Antal sider10
ISSN1402-2001
DOI
StatusUdgivet - mar. 2021

Bibliografisk note

Funding Information:
This study was funded by Aage V. Jensens Naturfond (AVJNF). Project title (in Danish): . Udvikling af en forvaltningsstrategi, der tilgodeser hele økosystemet i De Østlige Vejler

Publisher Copyright:
© 2020 International Association for Vegetation Science

Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.

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