Interactive effects of drought and edge exposure on old-growth forest understory species.

Autor: Koelemeijer IA; Department of Ecology, Environment and Plant Sciences, Stockholm University, 106 91 Stockholm, Sweden.; Bolin Centre for Climate Research, Stockholm University, 106 91 Stockholm, Sweden., Ehrlén J; Department of Ecology, Environment and Plant Sciences, Stockholm University, 106 91 Stockholm, Sweden.; Bolin Centre for Climate Research, Stockholm University, 106 91 Stockholm, Sweden., Jönsson M; Swedish Species Information Centre, Swedish University of Agricultural Sciences, 750 07 Uppsala, Sweden., De Frenne P; Forest & Nature Lab, Department of Environment, Faculty of Bioscience Engineering, Ghent University, Geraardsbergsesteenweg 267, 9090 Melle-Gontrode, Belgium., Berg P; SMHI (Swedish Meteorological and Hydrological Institute), 601 76 Norrköping, Sweden., Andersson J; Naturcentrum AB, Strandtorget 3, 444 30 Stenungsund, Sweden., Weibull H; Naturcentrum AB, Strandtorget 3, 444 30 Stenungsund, Sweden., Hylander K; Department of Ecology, Environment and Plant Sciences, Stockholm University, 106 91 Stockholm, Sweden.; Bolin Centre for Climate Research, Stockholm University, 106 91 Stockholm, Sweden.
Jazyk: angličtina
Zdroj: Landscape ecology [Landsc Ecol] 2022; Vol. 37 (7), pp. 1839-1853. Date of Electronic Publication: 2022 May 20.
DOI: 10.1007/s10980-022-01441-9
Abstrakt: Context: Both climatic extremes and land-use change constitute severe threats to biodiversity, but their interactive effects remain poorly understood. In forest ecosystems, the effects of climatic extremes can be exacerbated at forest edges.
Objectives: We explored the hypothesis that an extreme summer drought reduced the richness and coverage of old-growth forest species, particularly in forest patches with high edge exposure.
Methods: Using a high-resolution spatially explicit precipitation dataset, we could detect variability in drought intensity during the summer drought of 2018. We selected 60 old-growth boreal forest patches in central Sweden that differed in their level of drought intensity and amount of edge exposure. The year after the drought, we surveyed red-listed and old-growth forest indicator species of vascular plants, lichens and bryophytes. We assessed if species richness, composition, and coverage were related to drought intensity, edge exposure, and their interaction.
Results: Species richness was negatively related to drought intensity in forest patches with a high edge exposure, but not in patches with less edge exposure. Patterns differed among organism groups and were strongest for cyanolichens, epiphytes associated with high-pH bark, and species occurring on convex substrates such as trees and logs.
Conclusions: Our results show that the effects of an extreme climatic event on forest species can vary strongly across a landscape. Edge exposed old-growth forest patches are more at risk under extreme climatic events than those in continuous forests. This suggest that maintaining buffer zones around forest patches with high conservation values should be an important conservation measure.
Supplementary Information: The online version contains supplementary material available at 10.1007/s10980-022-01441-9.
Competing Interests: Conflict of interestThe authors have no conflict of interest.
(© The Author(s) 2022.)
Databáze: MEDLINE
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