Search for dissertations about: "soil seed banks"
Found 5 swedish dissertations containing the words soil seed banks.
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1. Long-term studies of succession : Colonisation and seed banks
Abstract : Using data from long-term studies of the vegetation in two areas under primary succession, patterns of colonisation and the accumulated seed bank during plant succession were studied.At century-old small islands in Lake Hjälmaren, Sweden, the genetic structure of differently old populations of Moehringia trinervia and Lythrum salicaria was studied, using allozyme variation for M. READ MORE
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2. Ecology and evolution of local adaptation in Arabidopsis thaliana
Abstract : In this thesis, I investigate the ecological genetics of local adaptation in the annual herb Arabidopsis thaliana with the aim to identify key traits, agents of selection, and genomic regions contributing to adaptive differentiation. The thesis focuses on adaptive differentiation in timing of germination and seed dormancy between populations located close to the southern and northern range margins in Europe. READ MORE
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3. Ecological rehabilitation of degraded hill slopes in southern Wello, Ethiopia
Abstract : Clearing of vegetation has left large areas of southern Wello (Ethiopia) at a high risk ofland degradation. In this study, the causes, extent and consequences of land degradationproblems are reviewed. To see land cover changes, aerial photographs from 1958 and1986 were compared with the help of a GIS procedure. READ MORE
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4. Small-scale pattern and mobility of plant species in Alvar grassland
Abstract : Studies of the small-scale pattern, mobility of plant species and the effects of cattle dung deposition and decomposition on the soil seed banks and the above-ground vegetation were carried out in an alvar limestone grassland in Gettlinge, on the Baltic island of Öland, Sweden.A new method for pattern detection using transect data Patch Size Frequency Analysis (PASFRAN), was developed. READ MORE
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5. Ecology of the fire-dependent forest herbs Geranium bohemicum and G. lanuginosum in Sweden
Abstract : Geranium bohemicum and G. lanuginosum are the only plant species in Sweden considered fire-dependent, because of their heat-triggered germination. Both are today threatened due to effective fire suppression. An aim with this study was to elucidate their population ecology. READ MORE