Browsing Doctoral Theses / Doktorsavhandlingar Institutionen för växt- och miljövetenskaper by Title
Now showing items 8-21 of 21
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Greenhouse gas fluxes between drained forested peatlands and the atmosphere - influence of nutrient status and wood ash fertilization
(2009-04-24)The management of peatlands for wood production involves drainage and, sometimes, fertilization with, for example, wood ash. The effects of these measures on greenhouse gas fluxes, in relation to the nutrient status of the ... -
Impacts of Antifouling Compounds on Photosynthesis, Community Tolerance and psbA Genes in Marine Periphyton
(2008-12-18)ABSTRACT Toxicants can act as selective pressures in the environment, eliminating sensitive genotypes or species and favouring tolerant ones. Such toxicant-induced selection can be detected in natural communities using ... -
Interplay between phospholipids and digalactosyldiacylglycerol in phosphate limited oats
(2009-03-09)Phosphate is an essential nutrient. In most soils it is limiting, which has resulted in that phosphate is supplied as fertilizer to increase crop yield. Through evolution, plants have adapted several mechanisms to increase ... -
Land use effects on nitrous oxide emission from drained organic soils
(2010-05-21)Since industrialisation, the atmospheric concentration of greenhouse gases (GHG) has increased significantly. The most important anthropogenic GHGs are carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O). N2O is ... -
Management of urban woodlands - effects on bird communities and recreational values
(2011-05-07)The ongoing urbanisation increases the pressure on urban nature. Urban woodlands are receiving growing attention as they provide valuable ecosystem services to urban citizens, mainly by providing areas for recreation but ... -
On Toxicant-Induced Succession in Periphyton Communities: Effects of Single Chemicals and Chemical Mixtures
(2009-02-27)This thesis deals with the effects of single chemicals and chemical mixtures on biological communities. Ecosystems are exposed to complex mixtures of chemicals, and because combination effects can occur, it is necessary ... -
Phylogenetic and phyloclimatic inference of the evolution of Potentilleae (Rosaseae)
(2010-05-20)Polyploidization has occurred many times during the evolution of angiosperms. Allopolyploidization is believed to be the process behind many of these genome duplications, and has resulted in a genetically diverse angiosperm ... -
Phylogeny and biogeography of the plant family Calceolariaceae
(2010-11-26)Calceolaria L., Jovellana Ruiz & Pav., and Porodittia G. Don (=Stemotria Wettst. & Harms) toghether constitute the family Calceolariaceae consisting of approximately 300 species distributed manily in South America. The ... -
Process-based modelling of N losses from terrestrial ecosystems
(2010-05-20)Nitrogen (N) loss to atmosphere and ground water can contribute to environmental destruction, by N emission as the greenhouse gas nitrous oxide (N2O) and by leaching of N to contamination and eutrophication of water. Dynamic ... -
Reproductive Biology and Population Genetics of Common Ash (Fraxinus excelsior L.)
(2011-03-17)Common Ash, Fraxinus excelsior L. (Oleaceae) is a wind-pollinated, wind-dispersed, deciduous tree, commonly occurring throughout Central and Northern Europe. The thesis addresses several questions concerning reproductive ... -
Spatiotemporal Evolution of Neotropical Organisms: New Insights into an Old Riddle
(2008-11-07)Nowhere else on Earth are there so many species of plants and animals as in the Neotropical region. Yet, many questions remain concerning the causes underlying such outstanding diversification. In this thesis, I use a ... -
Steady, ready, go - proteomics of etioplast inner membranes reveals a high readiness for light
(2009-05-25)Light is essential for development of photosynthetically active chloroplasts. In the absence of light proplastids develop into etioplasts which are readily transformed into chloroplasts upon illumination. The etioplast ... -
The influence of climate on ozone risk for vegetation
(2011-05-11)Ground-level ozone (O3) is a harmful air pollutant causing reduced crop yield and quality, reduced forest growth and negative effects on human health in large parts of the world. O3 is generally seen as a regional scale ... -
When the Rubber Meets the Road -Ecotoxicological Hazard and Risk Assessment of Tire Wear Particles
(2008-09-18)Large amounts of rubber particles are dispersed into the environment due to tire wear. The rubber contains a wide range of chemicals, including several of environmental concern. The purpose of this thesis, which is based ...