Response of <Emphasis Type="Italic">Sphagnum</Emphasis> species mixtures to increased temperature and nitrogen availability |
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Authors: | Angela Breeuwer Monique M P D Heijmans Maurits Gleichman Bjorn J M Robroek Frank Berendse |
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Institution: | (1) Nature Conservation and Plant Ecology Group, Wageningen University, P.O. Box 47, Wageningen, 6700 AA, The Netherlands;(2) Lange Weide 41, 5397 AG Lith, The Netherlands;(3) School of Geography, University of Leeds, West Yorkshire, LS2 9JT, UK |
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Abstract: | To predict the role of ombrotrophic bogs as carbon sinks in the future, it is crucial to understand how Sphagnum vegetation in bogs will respond to global change. We performed a greenhouse experiment to study the effects of two temperature
treatments (17.5 and 21.7°C) and two N addition treatments (0 and 4 g N m−2 year−1) on the growth of four Sphagnum species from three geographically interspersed regions: S. fuscum, S. balticum (northern and central Sweden), S. magellanicum and S. cuspidatum (southern Sweden). We studied the growth and cover change in four combinations of these Sphagnum species during two growing seasons. Sphagnum height increment and production were affected negatively by high temperature and high N addition. However, the northern species
were more affected by temperature, while the southern species were more affected by N addition. High temperature depressed
the cover of the ‘wet’ species, S. balticum and S. cuspidatum. Nitrogen concentrations increased with high N addition. N:P and N:K ratios indicated P-limited growth in all treatments
and co-limitation of P and K in the high N treatments. In the second year of the experiment, several containers suffered from
a severe fungal infection, particularly affecting the ‘wet’ species and the high N treatment. Our findings suggest that global
change can have negative consequences for the production of Sphagnum species in bogs, with important implications for the carbon sequestration in these ecosystems. |
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Keywords: | Climate change Fungal infection Nitrogen deposition Ombrotrophic bog Production Species cover Sphagnum Temperature |
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