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• W1569296833 abstract "The Scottish Borders fens represent an important group of British fen sites. Despite theirsmall size many of these fens support various rare plant communities and nationally andlocally rare plant species as well as a wide range of species characteristic of wetland habitats.This study has demonstrated the importance of management history, site chemical conditionsand site size and morphology in the vegetation development of the Scottish Borders fens.2. Sixty-eight sites were included in a general survey. The vegetation at these sites wassystematically recorded. Site features (vegetation rafts, springs, drains), surrounding land-use,gross peat stratigraphy and measurements of pH and electrical conductivity of the fen waterwere also recorded. A subset of contrasting sites was selected for detailed investigations intosite chemical conditions and peat fertility, peat stratigraphy and the development of vegetationrafts.The quadrat data were analysed using a range of multivariate classification procedures. Oneclassification was selected as the basis for the description of Scottish Borders fen plantcommunities. Twenty-four plant communities and variants are described representing rich-fen,poor-fen, bog, tall herb fen, fen meadow and swamp habitat types. The Scottish Borders fenplant communities were compared to existing comprehensive classifications of British fenvegetation.4. The impact of marl and peat extraction at each site was investigated using documentary,visual and stratigraphic evidence for disturbance at each site. The status of each site wasdetermined (cutover, partly cutover, un-disturbed) and this was related to the development ofthe present vegetation. Most of the Scottish Borders fens have been cut for peat or marl tosome extent. However at some sites the peat stratigraphic sequences represent un-modifiedpeat development since the late glacial. The efficiency of drains, strength of springs and basinmorphology are important factors determining the development of vegetation over former peatand marl cuttings.5. Site chemical conditions show much variation. The intensity of the surrounding land-use ispositively correlated with peat fertility at the edges and water inflows of sites. The main axesof floristic variation correspond to the variation in base-richness of the fen water and fertility.There was no simple relationship between chemical variables and the occurrence of differentplant communities.6. The vegetation has developed as a quaking raft over fluid peat at many sites. Two Sphagnumdominated plant communities are confined to vegetation rafts. Their occurrence is determinedby the inundation of the vegetation surface with base-rich water, the depth of the fluid peatbeneath the raft and the degree of isolation of the vegetation surface from telluric water input.Where the vegetation has developed as a raft over the entire site the thickest rafts are found inthe central areas. The mechanisms of central raft thickening are thought to be influenced bydifferential fluctuation of the water table relative to the vegetation surface across sites." @default.
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• W1569296833 date "1997-01-01" @default.
• W1569296833 modified "2023-09-28" @default.
• W1569296833 title "The Scottish Borders fens : controls on vegetation development and composition" @default.
• W1569296833 hasPublicationYear "1997" @default.
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