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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Hävdens inverkan på fenologi och artrikedom i ängen

Nilsson, Emelie January 2015 (has links)
Gotland is the richest place in the world when it comes to wooded meadows. Traditional management with haymaking and raking for centuries have turned wooded meadows into exceptionally species rich habitats in the agricultural landscape. Since the early 1900’s the area of managed meadows has decreased rapidly. The aim of this study was to investigate if there are differences between continuously managed areas and areas that had been left out, in Lojsta and Gerum on southern Gotland. The results show that there are significant differences in species diversity between the two types of management in both meadows. There was also a relationship between the two parameters temperature and growth. The conclusion of this study is that if it is of interest to conserve wooded meadows with all its species, it is important to continue with the yearly cycle of traditional management.
2

"Vatten gifver gräs" : Ängsvattning i Sverige och i synnerhet i Malmöhus län

Wallin, Nils January 2011 (has links)
Ängsvattning kan ha förekommit i Sverige under medeltiden men blev vanligare först efter 1800. Föreliggande arbete visar dock att omfattande kunskap om, och faktiska vattningsängar fanns redan på 1760-talet. Tidigare studier rörande den senare utbredningen har främst rört Skåne under perioden 1865-1911 och baserats på Hushållningssällskapens statistik. Denna statistik är problematisk och till stora delar felaktig på grund av återkommande felrapporteringar, varför ängsvattningens omfattning under perioden måste revideras. För Malmöhus län reduceras de tidigare uppgifterna med 75 % vilket får konsekvenser även för anläggningstrenden över tid. Efter reduceringen återfinns ingen dominerande topp i anläggningstakten och hela ängsvattningsperioden kan förlängas in i tidigt 1900-tal. Ängsvattningens roll i den agrara revolutionen var således troligen mindre än vad som tidigare antagits. Samtidigt måste uppfattningen om ängsvattningssystemens storlekar och geografiska spridning revideras: systemen var många, små – ofta endast ett par hektar – och spridda över hela Malmöhus län, mellan 1865 och 1911 hade 172 socknar av 253 ängsvattning.
3

De Osynliga Ängarna : En studie av möjlig synergi mellan retrogressiv kartanalys och paleoekologisk profilering, applicerade på gårdar kring Sigtuna / The Unseen Meadows

Pettersson, Siri January 2020 (has links)
A test of combining retrogressive analysis of historic maps of the Sigtuna area villages Billby, Bärmö, Eneby, Til and Venngarn from the seventeenth century with archaeobotanical results pertaining to the tenth, eleventh and twelfth century. The study examines meadow distribution and character while aiming to determine to what extent retrogressive and archaeobotanical methods can compliment each other. Through the combination of methods, landscape change is discussed.  I explore how these meadows changed from the eleventh century to the seventeenth, which meadows could reasonably be presumed to have originated in prehistoric or early historic times and whether the hypothetical habitats produced by a previous archaeobotanical study of Sigtuna macrofossils could be tied to the meadows. The study shows that the grassland was generally wetter in the eleventh century, and that thirteen out of twenty meadows may have originated already in prehistoric time and been more or less continually mowed until at least late seventeenth century. Wet meadows, calcareous wet meadows, water meadows and potentially calcareous fens could be detected in the investigated area. The study shows that the multi-disciplinary approach as well as source pluralism indeed results in a beneficial analysis synergy and that the meadows in question are possible points of origin for the macrofossils from some of Sigtuna’s oldest strata.

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