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FÖRSTUDIE OM RESTAURERING AV VÄNGA MOSSE
University of Skövde, School of Life Sciences.
2012 (Swedish)Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
Abstract [sv]

Vänga mosse är en av de sex stora mossarna i Borås Stad med högsta naturvärde. Samtliga dessa mossar hotas av igenväxning av busk- och trädvegetation. Denna rapport presenterar en undersökning om hur Vänga mosse växer igen och vilka de troliga orsakerna kan vara.

En jämförelse av vegetationen på fem flygfoton från 1955, 1964, 1983, 1996 och 2007 över Vänga mosse genomfördes med hjälp av ArcGIS. Då flygfotona är uppbyggda av pixlar gick metoden ut på att dela upp fotonas pixlar i två värden för att sedan beräkna hur arean av igenväxningen har förändrats över tiden. Analysen visar att Vänga mosse har växt igen med 43,5% sedan 1955 och att den årliga igenväxningen varierat avsevärt mellan de olika perioderna. Av de fyra faktorer som undersöktes; temperatur, nederbörd, kvävenedfall (nitratkväve och ammoniumkväve) och svavelnedfall är det temperatur, nederbörd och kvävenedfallet som korrelerar positivt med igenväxningen. Nytt är att svavelnedfallet har en stark negativ korrelation till igenväxningen, vilket indikerar att den sura nederbörden under förra århundrandet har bromsat upp mossens igenväxning.

Abstract [en]

Vänga bog is one of the six large peat bogs in the Borås municipality which all have high biodiversity. All of these bogs are threatened by encroachment of shrubs and trees. This report presents a study of how the shrubs and trees are invading Vänga bog, and what the possible causes might be.

A comparison of vegetation via five aerial photos over Vänga bog from 1955, 1964, 1983, 1996 and 2007, was conducted using ArcGIS. Aerial photos are made up of pixels and the method used was to dived the pixels in two values (open ground and shrubs-trees) and then to calculate how the area of shrubs and trees has changed over time. The analysis shows that there was an increase in growth of 43.5% from 1955 to 2007 and that the annual growth varied considerably between the different periods.

Four factors were examined to determine the possible cause of such changes, namely, temperature, precipitation, atmospheric nitrogen (nitrate and ammonium) and sulphur deposition. The analysis contained within this report shows that temperature, precipitation and nitrogen deposits have a positive correlation to the growth of shrubs and trees. However, sulphur deposition exhibited the strongest correlation, indicating an inhibiting effect on growth of shrubs and trees during the end of the last century. These are new results when sulphur deposition was assumed to be a potential cause of growth of shrubs and trees on bogs in southern Sweden.

Place, publisher, year, edition, pages
2012. , 33 p.
National Category
Ecology
Identifiers
URN: urn:nbn:se:his:diva-6854OAI: oai:DiVA.org:his-6854DiVA: diva2:571954
Subject / course
Ecology
Educational program
Ecology - Study Programme
Uppsok
Life Earth Science
Supervisors
Examiners
Available from: 2012-11-26 Created: 2012-11-26

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Restaurering av Vänga Mosse(1311 kB)265 downloads
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