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Artrikedom i stadsnära hästhagar i Stockholms län
Södertörn University, School of Natural Sciences, Technology and Environmental Studies, Environmental Science.
Södertörn University, School of Natural Sciences, Technology and Environmental Studies, Environmental Science.
2018 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Pastures are important due to their high biodiversity. A constant change has taken place in pastures in Sweden where fewer pasture lands are being grazed and more are abandoned. Many cattle farms are converted to horse farms in suburban and urban areas. Furthermore, research has indicated that increased urbanisation can have an negative impact on biodiversity. When pastures are abandoned the land reverts to forest within which the diversity of plant species is reduced. In order to obtain a greater diversity of plant species the Intermediate Disturbance Hypothesis suggests moderate disturbance is required.

The purpose of this study is to investigate the effects of three anthropocentric factors on plant species richness at ten different horse farm paddocks in the municipalities Ekerö, Huddinge and Vallentuna, in Stockholm County. Twelve plots of 0.5 meters x 0.5 meters were investigated at each farm. Three factors are tested against plant species richness; The length of time pastures have been claimed by horses, the degree of disruption, the degree of urbanisation. We found that only certain plant species were affected by urbanisation and not all plant species, especially species that thrive in more overgrown habitats. An inverse correlation was found between the number of years of horse grazing and plant species richness. There was no difference in the plant species richness inside and outside the paddock. In these outcomes it appears that horse grazing has a significant impact on plant species. Pasture development and maintenance are important factors that influence the composition of species.

Abstract [sv]

Betesmarker är viktiga naturtyper med sin höga artrikedom. I Sverige är de i ständig förändring, de överges och många gårdar med nötboskap ställs om till hästgårdar i suburbana-och urbana områden. Forskning visar på att en ökad urbanisering ger negativa effekter på den biologiska mångfalden. När betesmarker blir övergivna upphör hävd, vilket innebär att en successionsutveckling sker. Betesmarken växter igen till en skog där artrikedomen minskar. För att få en högre artrikedom behövs hävd på en medelstark störningsnivå, enligt intermediära störningshypotesen.

Syftet med studien är att undersöka effekter på växtarter från tre antropocentriska faktorer. Underlaget i studien består av växtartsinventeringar utförda i tio hästhagar, med tolv provrutor 0,5 x 0,5 meter i varje hästhage. Dessa utfördes i kommunerna, Ekerö, Huddinge och Vallentuna i Stockholms län.Tre faktorer testas gentemot artrikedom; Längden betesmarkerna hävdats med häst, låg-respektive hög störningsgrad samt graden av urbanisering. Vi upptäckte att urbaniseringen endast påverkade vissa arter och inte alla, framförallt arter som trivs i mer igenväxta habitat. Ett mönster hittades hos antalet år med hästbete i relation till artrikedom. Det hittades ingen skillnad i artrikedom innanför-och utanför hagen. Det framkom att hästbete har en betydande påverkan på artrikedom. Betesmarkens utveckling och underhåll är också viktiga faktorer som spelar in på artsammansättningen.

Place, publisher, year, edition, pages
2018. , p. 29
Keywords [sv]
biologisk mångfald, succession, urbanisering, artinventering, provrutor
National Category
Environmental Sciences
Identifiers
URN: urn:nbn:se:sh:diva-37210OAI: oai:DiVA.org:sh-37210DiVA, id: diva2:1276954
Subject / course
Environmental Science
Uppsok
Life Earth Science
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Projects
Tätortsnära kulturlandskap i förvandling - implikationer för ekosystemtjänster i lokal planeringAvailable from: 2019-01-09 Created: 2019-01-09 Last updated: 2019-01-09Bibliographically approved

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910111213141512 of 27
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