Artikkelit jotka sisältää sanan 'Calluna'
Early 20th century Russian peat scientists as possible vectors for the establishment of Calluna vulgaris in Georgian Sphagnum bogs.
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In the summer of 2000, a stand of Calluna vulgaris (L.) Hull was found in the Ispani 2 bog near Kobuleti, being the first known occurrence of this species in Georgia (Transcaucasia). Pollen analysis of a peat core from the Calluna vulgaris stand shows that the species established itself there around 1920/1930. Dispersal by migrating birds, deliberate introduction as a garden plant, and unintentional introduction with cultural products are shown to have been improbable vectors for introduction far from the species’ main distribution area. It is concluded that Calluna vulgaris may have been accidentally introduced by Russian peat scientists and prospectors that were active in the area around the time of establishment.
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Kaffke,
Botanical Institute, Grimmer Straße 88 D-17487 Greifswald, Germany
Sähköposti:
ei.tietoa@nn.oo
- Matchutadze, Sähköposti: ei.tietoa@nn.oo
- Couwenberg, Sähköposti: ei.tietoa@nn.oo
- Joosten, Sähköposti: ei.tietoa@nn.oo
Methods for studying below-ground production in mire ecosystems.
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Difficulties in separating fine roots from a purely organic matrix preclude the use of traditional root-harvesting techniques when studying the below-ground production of the field layer species in mires. Also methods based on different types of installations, such as ingrowth chambers or rhizotrons, cause a significant disturbance of the root environment. Indirect techniques using isotope-labelling avoid many of these problems and are the most suited for studying below-ground processes in peatlands. A technique based on translocation of 14C to the peat through the fine roots is demonstrated to evaluate the vascular plant biomass distribution in hummocks of a subarctic and a boreonemoral peat bog respectively. The technique fails to distinguish between structural and labile carbon and overestimates therefore the fine root biomass, but is useful for comparative purposes. It is shown that different mire plants have species-specific below-ground distributions, and that a proportionately greater share of carbon is allocated to fine roots in subarctic conditions.
Keywords: Andromeda, Calluna, Empetrum, Eriophorum,root biomass, Rubus,translocation
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Wallén,
Department of Plant Ecology, Lund University, Östra Vallgatan 14, S-223 61 Lund, Sweden
Sähköposti:
ei.tietoa@nn.oo
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