Diss. (sammanfattning) Linköping : Univ., 2003. / Härtill 4 uppsatser.

<p>On commission of the County administrative board in Värmland County a method was developed for analysis of the occurrence of artificial land use at lakes and watercourses. With artificial land use is meant land significantly affected by man. Two bases have been used to carry out the analysis. In one of the analysis the vegetation database and in the other GSD¹-Marktäckedata (land cover data) was used (this method has been used by County administrative board in Jönköping County).</p><p>The analysis comprises all watercourses within Alsterälven river basin. The digital water bodies are created by the Swedish Meteorological and Hydrological Institute on the basis of GSD-Översiktskartan (general map). The water layer is derived from GSD-Fastighetskartan (property map) and has been used as water theme in both analyses. In order to make them match each other two models have been used, one manual and one automatic.</p><p>Vegetation data and GSD-Marktäckedata have been complemented with information about cut forest from the Swedish Forest Agency and roads from the Swedish Road Administration. Vegetation data has also been completed with power line area from the forest phase layer and GSD-Marktäckedata with buildings from GSD-Fastighetskartan. The definition artificial land uses has been classified in the vegetation data according to environmental quality criteria; cut forest, field and building sites. In the GSD-Marktäckedata has artificial land use has been classified to environmental quality criteria; cut forest, field, buildings and building sites. The artificial land use types have been summarized individually, totally and indicated as percentage of the total area. The results of the assessment are expressed in a scale of 1-5 for each water body.</p><p>The resolution of the vegetation database is lower than in the GSD-Marktäckedata. The comparison between the vegetation database and GSD-Marktäckedata shows that artificial land use differ in area. In the vegetation database buildings are included in the data base, in GSD-Marktäckedata buildings with a buffer at 20 meters were added to the base map. The buildings in GSD-Marktäckedata cover “more space” and the percentage artificial land became larger.</p>

On commission of the County administrative board in Värmland County a method was developed for analysis of the occurrence of artificial land use at lakes and watercourses. With artificial land use is meant land significantly affected by man. Two bases have been used to carry out the analysis. In one of the analysis the vegetation database and in the other GSD¹-Marktäckedata (land cover data) was used (this method has been used by County administrative board in Jönköping County). The analysis comprises all watercourses within Alsterälven river basin. The digital water bodies are created by the Swedish Meteorological and Hydrological Institute on the basis of GSD-Översiktskartan (general map). The water layer is derived from GSD-Fastighetskartan (property map) and has been used as water theme in both analyses. In order to make them match each other two models have been used, one manual and one automatic. Vegetation data and GSD-Marktäckedata have been complemented with information about cut forest from the Swedish Forest Agency and roads from the Swedish Road Administration. Vegetation data has also been completed with power line area from the forest phase layer and GSD-Marktäckedata with buildings from GSD-Fastighetskartan. The definition artificial land uses has been classified in the vegetation data according to environmental quality criteria; cut forest, field and building sites. In the GSD-Marktäckedata has artificial land use has been classified to environmental quality criteria; cut forest, field, buildings and building sites. The artificial land use types have been summarized individually, totally and indicated as percentage of the total area. The results of the assessment are expressed in a scale of 1-5 for each water body. The resolution of the vegetation database is lower than in the GSD-Marktäckedata. The comparison between the vegetation database and GSD-Marktäckedata shows that artificial land use differ in area. In the vegetation database buildings are included in the data base, in GSD-Marktäckedata buildings with a buffer at 20 meters were added to the base map. The buildings in GSD-Marktäckedata cover “more space” and the percentage artificial land became larger.

Carbon accumulation in soils constitutes a significant sink for carbon. How the climate change with increasing temperatures will affect the soil carbon storage represents uncertainty of the predictions in the climate change ecosystem feedback mechanisms. In this study the temperature impact on the decomposition of the large carbon pools in peatlands was investigated. Peat cores from different microtopographic units in a boreal oligotrophic minerogenic mire in northern Sweden were collected from in three depths (5-10, 10-15 and 15-20 centimeters below the surface). The samples were incubated at four temperatures: 4, 9, 14 and 19°C and the heterotrophic respiration (CO2- production) was measured hourly or 37 days. Unexpectedly, basal respiration did not show any correlation with temperature. However, the exponential increase in respiration (µ) was correlated with temperature: i.e.  giving Q10 values between 2 (SE +/- 0.36) and 5 (SE +/-1.05). Soil depth or vegetation covers did not affect temperature response (Q10) of µ. The substrate induced respiration (SIR) did not occour but for a few of the samples. The conclusion from this study is that degradation of peat seams not be affected by a temperature increase. The addition of glucose, nitrogen and phosphorus increased with increasing temperature with a Q10 value as expected.