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[{"key": "dc.contributor.advisor", "value": "Meril\u00e4inen, Jarmo.", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "Kauppila, Tommi.", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Nikolajev-Wikstr\u00f6m, Leena", "language": null, "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2015-09-14T07:22:01Z", "language": "", "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2015-09-14T07:22:01Z", "language": "", "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2015", "language": null, "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.other", "value": "oai:jykdok.linneanet.fi:1495019", "language": null, "element": "identifier", "qualifier": "other", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/46806", "language": "", "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "T\u00e4ss\u00e4 tutkielmassa selvitettiin turvetuotannon ja muun maank\u00e4yt\u00f6n aiheuttamia ekosysteemimuutoksia kahdessa keskisuomalaisessa mets\u00e4j\u00e4rvess\u00e4, Martinj\u00e4rvess\u00e4 ja Iso Kivij\u00e4rvess\u00e4. Tutkimus perustui paleolimnologiseen piilev\u00e4analyysiin, joka kattoi aikajakson 1600-luvulta nykyp\u00e4iv\u00e4\u00e4n. Martinj\u00e4rven valuma-alueella on turvetuotantoa, mutta vertailuj\u00e4rven\u00e4 toimineella Iso Kivij\u00e4rven valuma-alueella sit\u00e4 ei ole. J\u00e4rvien ominaisuudet ovat paljolti samankaltaisia, molemmat ovat matalia, pieni\u00e4 humusj\u00e4rvi\u00e4. Martinj\u00e4rvell\u00e4 piilevien monimuotoisuudessa oli suurempaa luonnollista vaihtelua kuin Iso Kivij\u00e4rvell\u00e4. Iso Kivij\u00e4rvell\u00e4 monimuotoisuus ja lajim\u00e4\u00e4r\u00e4t ovat olleet laskussa 1900-luvun ajan aiempiin vuosisatoihin verrattuna. Molemmat j\u00e4rvet ovat muuttuneet rehev\u00e4mmiksi. J\u00e4rvien rehev\u00f6itymiskehitys alkoi eroosion voimistumisen, humuksen m\u00e4\u00e4r\u00e4n lis\u00e4\u00e4ntymisen ja piilev\u00e4lajiston muutosten perusteella jo 1930-luvulla. Maatalous oli ensin syyn\u00e4 rehev\u00f6itymiskehitykseen ja 1960-luvulta alkaen my\u00f6s mets\u00e4talouden ojitukset. Martinj\u00e4rvi on ollut lajiston perusteella rehevimmill\u00e4\u00e4n 1930-luvulla ja 2000-luvulla. Iso Kivij\u00e4rvi on ollut rehevimmill\u00e4\u00e4n 1970-luvulta vuoteen 2000, mutta my\u00f6s 2000-luvulla. Turvetuotanto Martinj\u00e4rven valuma-alueella alkoi 1970-luvun lopussa. Iso Kivij\u00e4rvi oli rehev\u00e4mm\u00e4ss\u00e4 tilassa 1970-luvulla kuin Martinj\u00e4rvi. J\u00e4rvien kokonaisfosforipitoisuudet ja lajisto on ollut vuosina 2004\u20132012 samankaltaista ja molemmat j\u00e4rvet ovat rehev\u00f6ityneet viel\u00e4 2000-luvulla johtuen todenn\u00e4k\u00f6isesti mets\u00e4talouden kunnostusojituksista. Mallinnetut kokonaisfosforipitoisuudet aliennustavat mitattuja vanhempia pitoisuuksia, mutta vastaavat hyvin viimeaikaisia mitattuja pitoisuuksia vuosilta 2004\u20132012. Piilev\u00e4aineiston perusteella voidaan sanoa, ett\u00e4 turvetuotannolla ei ole ollut suurempaa vaikutusta Martinj\u00e4rven ekologisen tilan kehitykseen.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "In this study, ecosystem changes influenced by peat production and other land use were studied in two central Finland forest lakes, Martinj\u00e4rvi and Iso Kivij\u00e4rvi. The study was based on paleolimnological diatom analysis and the period for examination was from the 17th century to this day. There is peat production in the catchment area of Martinj\u00e4rvi but not in the catchment area of the reference lake Iso Kivij\u00e4rvi. Properties of the lakes are largely similar, both are shallow small humic lakes. In Martinj\u00e4rvi, there was more natural variation in diversity of diatoms than in Iso Kivij\u00e4rvi. In Iso Kivij\u00e4rvi, the diversity and number of species have been declining in the 20th century compared to earlier centuries. Both lakes are now eutrophic. In both lakes, eutrophication process began already in the 1930`s as indicated by intensification of erosion, increasing quantities of humus and changes in diatom species composition. Agriculture was the first to blame for the eutrophication process and it was followed by forestry related drainage starting in the 1960`s which increased eutrophication. Martinj\u00e4rvi has been at its most eutrophic phase in the 1930\u00b4s and in the 21st century based on diatoms. Iso Kivij\u00e4rvi had its most eutrophic phase from the 1970\u00b4s to year 2000 but also during the 21st century. Peat production at Martinj\u00e4rvi\u00b4s catchment area began at the end of the 1970`s. Iso Kivij\u00e4rvi was probably more eutrophic than Martinj\u00e4rvi between 1970`s and year 2000. In both lakes, total phosphorus concentrations and species composition have been similar during recent years (2004-2012) and both lakes have become even more eutrophic during recent years probably due to drainage related to forestry. Modeled total phosphorus concentrations underestimate older measured concentrations but correspond well with the latest measured concentrations during years 2004-2012. Based on the present data of diatom remains, it can be said that peat production has not had any significant effect on the ecological status of Martinj\u00e4rvi.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted using Plone Publishing form by Leena Nikolajev-Wikstr\u00f6m (lemaniko) on 2015-09-14 07:22:00.324898. Form: Pro gradu -lomake (https://kirjasto.jyu.fi/julkaisut/julkaisulomakkeet/pro-gradu-lomake). JyX data: [jyx_publishing-allowed (fi) =True]", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by jyx lomake-julkaisija (jyx-julkaisija.group@korppi.jyu.fi) on 2015-09-14T07:22:00Z\r\nNo. of bitstreams: 2\r\nURN:NBN:fi:jyu-201509142857.pdf: 2025484 bytes, checksum: 9ccf96a7ee2d73f858e2c211e93417e0 (MD5)\r\nlicense.html: 4887 bytes, checksum: 75b8ab3e603ed5a91eabdfd599ed2108 (MD5)", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2015-09-14T07:22:01Z (GMT). No. of bitstreams: 2\r\nURN:NBN:fi:jyu-201509142857.pdf: 2025484 bytes, checksum: 9ccf96a7ee2d73f858e2c211e93417e0 (MD5)\r\nlicense.html: 4887 bytes, checksum: 75b8ab3e603ed5a91eabdfd599ed2108 (MD5)\r\n Previous issue date: 2015", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "1 verkkoaineisto (58 sivua)", "language": null, "element": "format", "qualifier": "extent", "schema": "dc"}, {"key": "dc.format.mimetype", "value": "application/pdf", "language": null, "element": "format", "qualifier": "mimetype", "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.subject.other", "value": "paleolimnologia", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "piilev\u00e4j\u00e4\u00e4nteet", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "Iso Kivij\u00e4rvi", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "Martinj\u00e4rvi", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "stratigrafia", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "p\u00e4\u00e4komponenttianalyysi", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "kokonaisfosfori", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Turve- ja mets\u00e4talouden vaikutukset kahden mets\u00e4j\u00e4rven ekosysteemiin : paleolimnologinen piilev\u00e4analyysi", "language": null, 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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": "University of Jyv\u00e4skyl\u00e4", "language": "en", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "Jyv\u00e4skyl\u00e4n yliopisto", "language": "fi", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Akvaattiset tieteet", "language": "fi", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Aquatic sciences", "language": "en", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.date.updated", "value": 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"dc.subject.oppiainekoodi", "value": "4012", "language": null, "element": "subject", "qualifier": "oppiainekoodi", "schema": "dc"}, {"key": "dc.subject.yso", "value": "paleolimnologia", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "piilev\u00e4t", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "stratigrafia", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "fosfori", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "Iso Kivij\u00e4rvi", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "Martinj\u00e4rvi", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.format.content", "value": "fulltext", "language": null, "element": "format", 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