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- W2186100413 abstract "Our climate is in change. Carbon dioxide (CO2) levels this high, as the present CO2concentration (≈370 ppm), have not been seen for the past 420 000 years. The cause for this isa combination of industrial CO2 emissions, the burning of fossil fuels and emissions arisingfrom land use changes, such as deforestation and cultivation of virgin lands etc. An approachto this problem could be storage of CO2. Deep saline aquifers have the greatest storagepotentials in the Nordic countries. Yet, it will probably take one or two decades before thetechnique for storage of CO2 will be applicable in a greater extent in Europe. A condition forstorage of CO2 is to find storage places that guarantee that eventual leakage will have noessential significance in a time period of a couple of hundred years.The aim of this thesis is to find plant indicators on elevated CO2 concentration that could beused in detecting leakages of stored CO2. A comparison was done between plant communitiesnear a CO2 spring in Italy that were exposed to elevated CO2 concentration and plantcommunities in a control area with ambient CO2 concentration regarding the percentage coverof vascular plants. Ellenberg indices of soil pH (R), light (L), soil moisture (F) and nitrogencontent (N) were used to estimate and compare the environmental conditions and vegetationpreferences of the two study areas. Shannon-Wiener- and evenness indices were calculated forthe two study areas. Ordination method, Correspondence Analysis (CA), was used to illustratedifferences, similarities and gradients in the collected data material.There were no significant differences between the CO2 area and control area regarding coveror Shannon-Wiener- and evenness indices. However, there were significant differences inEllenberg indices for soil pH and nitrogen content between the CO2 and control area. Theordination showed a strong correlation with the first axis in the CA-diagram and the F, N andR-indices, consequently creating a gradient between them. Although some significantdifferences were found between the areas, the general conclusion is that no clear differencescan be found between an area with elevated CO2 concentration and another with ambient CO2concentration when looking at the vegetation composition alone." @default.
- W2186100413 created "2016-06-24" @default.
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- W2186100413 date "2005-01-01" @default.
- W2186100413 modified "2023-09-27" @default.
- W2186100413 title "Impacts on plant communities by elevated CO 2 concentration" @default.
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