Artikkelit jotka sisältää sanan 'Rubus'
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
Ojituksen vaikutuksesta soiden kenttäkerroksen kasvilajeihin.
English title: Changes in the ground vegetation of drained mires.
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The aim of this research was to study how some species of mire plants with differing ecological characteristics react to environmental changes caused by drainage. The data has been collected from 254 sample plots, each 1 km2 in area, in the southern and middle part (60-66°N) of Finland during the years 1984-1986. The occurrence of each species was studied both in virgin and in drained peatlands, and the note about mire type and drainage succession stage were recorded. For cloudberry (Rubus chamae-morus), the abundance of vegetation and berries were also indicated. There is a clear decline in the appearance of sedge plants as the succession, caused by ditching proceeds. Of herbs, Athyrium filix-femina and Cirsium palustre, become more common after drainage, but the flark level species, Drosera anglica and Lysimachia thyrsiflora disappear. As the drainage proceeds there is a clear decline in the vegetation and berry production of cloudberry. On the most effectively drained peatlands, more than half of the observations of cloudberry vegetation and all the observations of berry produce, indicated scanty growth and crop. The most abundant vegetation and yield of berries occurred in virgin peatlands.
Keywords: Drained mires, ground vegetation change, Rubus chamae-morus, succession
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Aapala,
University of Oulu, Department of Botany, Linnanmaa, SF-90570 Oulu
Sähköposti:
ei.tietoa@nn.oo
- Kokko, Sähköposti: ei.tietoa@nn.oo
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