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Vegetation transition following drainage in a high-latitude hyper-oceanic ecosystem
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Vegetation transition following drainage in a high-latitude hyper-oceanic ecosystem
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Vegetation transition following drainage in a high-latitude hyper-oceanic ecosystem
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Journal Article
Vegetation transition following drainage in a high-latitude hyper-oceanic ecosystem
2010
Overview
Questions: How does draining affect the composition of vegetation? Are certain functional groups favoured? Can soil parameters explain these differences? Location: Central Faroe Islands, treeless islands in the northern boreal vegetation zone. Since 1987, an area of 21km² at 100–200 m a. s. l. was drained in order to provide water for hydro-electric production. Method: Vegetation and soil of a drained area and a control, undrained neighbouring area of approximately the same size were sampled in 2007. Six sites were sampled in each area. The vegetation was classified with cluster analysis. Results: Four plant communities were defined in the area: Calluna vulgaris–Empetrum nigrum-Vaccinium myrtillus heath, Scirpus cespitosus–Eriophorum angustifolium blanket mire, Carex bigelowii-Racomitrium lanuginosum moss-heath, Narthecium ossifragum-Carex panacea mire. Heath was more extensively distributed within, and was the dominant community of the drained area, whereas mossheath was more extensive in the undrained area.Blanket mire and mire had approximately the same distribution in both areas. For the blanket mire, species composition indicated drier conditions in the drained than in the undrained area. The drained area had higher frequencies of woody species and lichens, grasses had finer roots and available soil phosphate was considerably higher, whereas the undrained area had higher frequencies of grasses and sedges. Conclusion: The dominant plant communities were different in the two areas, which indicated that the blanket mire was drying in the drained area. Higher concentration of soil phosphate in the drained area also indicated increased decomposition of organic soils owing to desiccation.
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