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The effect of past changes in inter-annual temperature variability on tree distribution limits

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Abstract Aim 

The northern limits of temperate broadleaved species in Fennoscanndia are controlled by their requirements for summer warmth for successful regeneration and growth as well as by the detrimental effects of winter cold on plant tissue. However, occurrences of meteorological conditions with detrimental effects on individual species are rare events rather than a reflection of average conditions. We explore the effect of changes in inter-annual temperature variability on the abundances of the tree species Tilia cordata, Quercus robur and Ulmus glabra near their distribution limits using a process-based model of ecosystem dynamics. Location 

A site in central Sweden and a site in southern Finland were used as examples for the ecotone between boreal and temperate forests in Fennoscandia. The Finnish site was selected because of the availability of varve-thickness data. Methods 

The dynamic vegetation model LPJ-GUESS was run with four scenarios of inter-annual temperature forcing for the last 10,000 years. In one scenario the variability in the thickness of summer and winter varves from the annually laminated lake in Finland was used as a proxy for past inter-annual temperature variability. Two scenarios were devised to explore systematically the effect of stepwise changes in the variance and shape parameter of a probability distribution. All variability scenarios were run both with and without the long-term trend in Holocene temperature change predicted by an atmospheric general circulation model. Results 

Directional changes in inter-annual temperature variability have significant effects on simulated tree distribution limits through time. Variations in inter-annual temperature variability alone are shown to alter vegetation composition by magnitudes similar to the magnitude of changes driven by variation in mean temperatures. Main conclusions 

The varve data indicate that inter-annual climate variability has changed in the past. The model results show that past changes in species abundance can be explained by changes in the inter-annual variability of climate parameters as well as by mean climate. Because inter-annual climatic variability is predicted to change in the future, this component of climate change should be taken into account both when making projections of future plant distributions and when interpreting vegetation history.
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Keywords: Distribution limits; Fennoscandia; LPJ-GUESS; inter-annual variability; temperature; varves; vegetation model

Document Type: Research Article

Affiliations: 1: Department of Earth and Ecosystem Sciences, Geobiosphere Science Centre, Lund University, Sölvegatan 12, 223 62 Lund, Sweden 2: Geological Survey of Finland, PO Box 96, FIN-02151 Espoo, Finland 3: Department of Geology, PO Box 64, FIN-00014, University of Helsinki, Helsinki, Finland 4: Department of Geography, University of Liverpool, Roxby Building, Liverpool L69 7ZT, UK

Publication date: 2010-07-01

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