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[{"key": "dc.contributor.author", "value": "Makkonen, Elina", "language": "", "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2025-01-10T07:28:57Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2025-01-10T07:28:57Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2024", "language": "", "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/99357", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Porojen laidunnus on ollut merkitt\u00e4v\u00e4 Pohjois-Suomen luonnon muovaaja jo vuosikymmenten ajan. Porot (Rangifer tarandus tarandus) k\u00e4ytt\u00e4v\u00e4t ravinnokseen useita eri kasvi- ja j\u00e4k\u00e4l\u00e4lajeja, joiden yhteis\u00f6ihin laidunnuksella on suora ja v\u00e4lillinen vaikutus. Laidunnuspaineen lis\u00e4ksi kylmiin olosuhteisiin sopeutuneisiin kasveihin kohdistuu erilaisia ilmastonmuutoksen aiheuttamia stressitekij\u00f6it\u00e4, kuten muutokset lumipeitteisen ajanjakson pituudessa ja lumim\u00e4\u00e4riss\u00e4. T\u00e4ss\u00e4 tutkimuksessa selvitettiin, millaisia vaikutuksia porolaidunnuksella ja ilmastonmuutoksesta johtuvilla lumim\u00e4\u00e4r\u00e4n muutoksilla on boreaalisen vy\u00f6hykkeen kasvillisuuteen kahdessa erilaisessa habitaatissa, ravinteikkaalla lettosuolla ja v\u00e4h\u00e4ravinteisella m\u00e4ntykankaalla. Molemmille habitaatille oli perustettu yhteens\u00e4 72 koealaa, jotka edustivat laidunnettuja tai laiduntamattomia alueita. Lumim\u00e4\u00e4r\u00e4n muutoksen vaikutusta tutkittiin talviaikaisella lumik\u00e4sittelyll\u00e4, jossa koealat edustivat luonnontilaista kontrollia, lumen v\u00e4hennysruutua ja lumen lis\u00e4ysruutua. Koealoihin tehtiin pistefrekvenssimenetelm\u00e4ll\u00e4 kasvillisuusmittaus. Tulokset osoittivat, ett\u00e4 laidunnus tai lumim\u00e4\u00e4r\u00e4 eiv\u00e4t vaikuttaneet kasviyhteis\u00f6jen monimuotoisuuteen kummassakaan habitaatissa. Porojen laidunnus v\u00e4hensi merkitsev\u00e4sti lettosuon kasviyhteis\u00f6jen lajim\u00e4\u00e4r\u00e4\u00e4, mutta lis\u00e4si ruohovartisten lajiryhm\u00e4n peitt\u00e4vyytt\u00e4. M\u00e4ntykankaalla laidunnus lis\u00e4si sammalten ja v\u00e4hensi j\u00e4k\u00e4lien lajim\u00e4\u00e4r\u00e4\u00e4. Lumim\u00e4\u00e4r\u00e4n v\u00e4heneminen ainoastaan lis\u00e4si leton ruohovartisten kasvien suhteellista peitt\u00e4vyytt\u00e4. Tuloksista k\u00e4y ilmi, ett\u00e4 laidunnus- ja lumik\u00e4sittelyn yhteisvaikutuksella voi olla merkityst\u00e4 lajiryhmist\u00e4 lettosuon sarakasvien ja varpujen sek\u00e4 m\u00e4ntykankaan sammalten ja varpujen peitt\u00e4vyyteen. Tutkimuksen perusteella porolaidunnuksella on merkitt\u00e4v\u00e4 vaikutus boreaalisen vy\u00f6hykkeen kasviyhteis\u00f6ihin erityisesti soilla, kun taas kokeellinen lumen m\u00e4\u00e4r\u00e4n lyhytaikainen muutos ei ole kasviyhteis\u00f6j\u00e4 merkitt\u00e4v\u00e4sti muovaava tekij\u00e4. T\u00e4m\u00e4nkaltaisten pitk\u00e4aikaisten seurantatutkimusten tuloksia voidaan hy\u00f6dynt\u00e4\u00e4 arvioitaessa porotalouden kest\u00e4vyytt\u00e4 ja ennakoidessa ilmastonmuutoksen aiheuttaman lumim\u00e4\u00e4r\u00e4n muutosten vaikutuksia boreaalisen vy\u00f6hykkeen kasviyhteis\u00f6ihin.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Paivi Vuorio (paelvuor@jyu.fi) on 2025-01-10T07:28:57Z\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2025-01-10T07:28:57Z (GMT). No. of bitstreams: 0\n Previous issue date: 2024", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "57", "language": "", "element": "format", "qualifier": "extent", "schema": "dc"}, {"key": "dc.language.iso", "value": "fin", "language": null, "element": "language", "qualifier": "iso", "schema": "dc"}, {"key": "dc.rights", "value": "In Copyright", "language": "en", "element": "rights", "qualifier": null, "schema": "dc"}, {"key": "dc.title", "value": "Porolaidunnuksen ja lumipeitteen vaikutukset boreaalisten habitaattien kasvillisuuteen", "language": "", "element": "title", "qualifier": null, "schema": "dc"}, {"key": "dc.type", "value": "master thesis", "language": null, "element": "type", "qualifier": null, "schema": "dc"}, {"key": "dc.identifier.urn", "value": "URN:NBN:fi:jyu-202501101129", "language": null, "element": "identifier", "qualifier": "urn", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Master\u2019s thesis", "language": "en", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Pro gradu -tutkielma", "language": "fi", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Matemaattis-luonnontieteellinen tiedekunta", "language": "fi", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Faculty of Sciences", "language": "en", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Bio- ja ymp\u00e4rist\u00f6tieteiden laitos", "language": "fi", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Department of Biological and Environmental Science", "language": "en", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "Jyv\u00e4skyl\u00e4n yliopisto", "language": "fi", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "University of Jyv\u00e4skyl\u00e4", "language": "en", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Ekologia ja evoluutiobiologia", "language": "fi", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Ecology and evolutionary biology", "language": "en", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "yvv.contractresearch.funding", "value": "0", "language": "", "element": "contractresearch", "qualifier": "funding", "schema": "yvv"}, {"key": "dc.type.coar", "value": "http://purl.org/coar/resource_type/c_bdcc", "language": null, "element": "type", "qualifier": "coar", "schema": "dc"}, {"key": "dc.rights.accesslevel", "value": "restrictedAccess", "language": null, "element": "rights", "qualifier": "accesslevel", "schema": "dc"}, {"key": "dc.type.publication", "value": "masterThesis", "language": null, "element": "type", "qualifier": "publication", "schema": "dc"}, {"key": "dc.subject.oppiainekoodi", "value": "4011", "language": "", "element": "subject", "qualifier": "oppiainekoodi", "schema": "dc"}, {"key": "dc.subject.yso", "value": "kasvillisuus", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "ilmastonmuutokset", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "laiduntaminen", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "poro", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "ekosysteemit (ekologia)", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "lumi", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.rights.url", "value": "https://rightsstatements.org/page/InC/1.0/", "language": null, "element": "rights", "qualifier": "url", "schema": "dc"}, {"key": "dc.rights.accessrights", "value": "The author has not given permission to make the work publicly available electronically. Therefore the material can be read only at the archival workstation at Jyv\u00e4skyl\u00e4 University Library (https://kirjasto.jyu.fi/collections/archival-workstation).", "language": "en", "element": "rights", "qualifier": "accessrights", "schema": "dc"}, {"key": "dc.rights.accessrights", "value": "Tekij\u00e4 ei ole antanut lupaa avoimeen julkaisuun, joten aineisto on luettavissa vain Jyv\u00e4skyl\u00e4n yliopiston kirjaston arkistoty\u00f6semalta. Ks. https://kirjasto.jyu.fi/kokoelmat/arkistotyoasema..", "language": "fi", "element": "rights", "qualifier": "accessrights", "schema": "dc"}]
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