A Race for Space? How Sphagnum fuscum stabilizes vegetation composition during long-term climate manipulations.

F. Keuper, E. Dorrepaal, P.M. van Bodegom, R.S.P van Logtestijn, T.V. Callaghan, J.H.C. Cornelissen

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

Strong climate warming is predicted at higher latitudes this century, with potentially major consequences for productivity and carbon sequestration. Although northern peatlands contain one-third of the world's soil organic carbon, little is known about the long-term responses to experimental climate change of vascular plant communities in these Sphagnum-dominated ecosystems. We aimed to see how long-term experimental climate manipulations, relevant to different predicted future climate scenarios, affect total vascular plant abundance and species composition when the community is dominated by mosses. During 8 years, we investigated how the vascular plant community of a Sphagnum fuscum-dominated subarctic peat bog responded to six experimental climate regimes, including factorial combinations of summer as well as spring warming and a thicker snow cover. Vascular plant species composition in our peat bog was more stable than is typically observed in (sub)arctic experiments: neither changes in total vascular plant abundance, nor in individual species abundances, Shannon's diversity or evenness were found in response to the climate manipulations. For three key species (Empetrum hermaphroditum, Betula nana and S. fuscum) we also measured whether the treatments had a sustained effect on plant length growth responses and how these responses interacted. Contrasting with the stability at the community level, both key shrubs and the peatmoss showed sustained positive growth responses at the plant level to the climate treatments. However, a higher percentage of moss-encroached E. hermaphroditum shoots and a lack of change in B. nana net shrub height indicated encroachment by S. fuscum, resulting in long-term stability of the vascular community composition: in a warmer world, vascular species of subarctic peat bogs appear to just keep pace with growing Sphagnum in their race for space. Our findings contribute to general ecological theory by demonstrating that community resistance to environmental changes does not necessarily mean inertia in vegetation response. © 2011 Blackwell Publishing Ltd.
Original languageEnglish
Pages (from-to)2162-2171
JournalGlobal Change Biology
Volume17
Issue number6
DOIs
Publication statusPublished - 2011

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Peat
vascular plant
peatland
vegetation
climate
Chemical analysis
Springs (water)
Snow
Organic carbon
growth response
Climate change
moss
Ecosystems
plant community
shrub
Carbon
warming
Productivity
Soils
ecological theory

Cite this

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title = "A Race for Space? How Sphagnum fuscum stabilizes vegetation composition during long-term climate manipulations.",
abstract = "Strong climate warming is predicted at higher latitudes this century, with potentially major consequences for productivity and carbon sequestration. Although northern peatlands contain one-third of the world's soil organic carbon, little is known about the long-term responses to experimental climate change of vascular plant communities in these Sphagnum-dominated ecosystems. We aimed to see how long-term experimental climate manipulations, relevant to different predicted future climate scenarios, affect total vascular plant abundance and species composition when the community is dominated by mosses. During 8 years, we investigated how the vascular plant community of a Sphagnum fuscum-dominated subarctic peat bog responded to six experimental climate regimes, including factorial combinations of summer as well as spring warming and a thicker snow cover. Vascular plant species composition in our peat bog was more stable than is typically observed in (sub)arctic experiments: neither changes in total vascular plant abundance, nor in individual species abundances, Shannon's diversity or evenness were found in response to the climate manipulations. For three key species (Empetrum hermaphroditum, Betula nana and S. fuscum) we also measured whether the treatments had a sustained effect on plant length growth responses and how these responses interacted. Contrasting with the stability at the community level, both key shrubs and the peatmoss showed sustained positive growth responses at the plant level to the climate treatments. However, a higher percentage of moss-encroached E. hermaphroditum shoots and a lack of change in B. nana net shrub height indicated encroachment by S. fuscum, resulting in long-term stability of the vascular community composition: in a warmer world, vascular species of subarctic peat bogs appear to just keep pace with growing Sphagnum in their race for space. Our findings contribute to general ecological theory by demonstrating that community resistance to environmental changes does not necessarily mean inertia in vegetation response. {\circledC} 2011 Blackwell Publishing Ltd.",
author = "F. Keuper and E. Dorrepaal and {van Bodegom}, P.M. and {van Logtestijn}, R.S.P and T.V. Callaghan and J.H.C. Cornelissen",
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A Race for Space? How Sphagnum fuscum stabilizes vegetation composition during long-term climate manipulations. / Keuper, F.; Dorrepaal, E.; van Bodegom, P.M.; van Logtestijn, R.S.P; Callaghan, T.V.; Cornelissen, J.H.C.

In: Global Change Biology, Vol. 17, No. 6, 2011, p. 2162-2171.

Research output: Contribution to JournalArticleAcademicpeer-review

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DO - 10.1111/j.1365-2486.2010.02377.x

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