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[{"key": "dc.contributor.advisor", "value": "Meril\u00e4inen, Jarmo", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "H\u00e4m\u00e4l\u00e4inen, Heikki", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Ahokas, Tiina", "language": null, "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2015-05-24T10:31:44Z", "language": "", "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2015-05-24T10:31:44Z", "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:1474156", "language": null, "element": "identifier", "qualifier": "other", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/46008", "language": "", "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Tutkielmassa selvitettiin turve- ja metsa\u0308talouden vaikutuksia Martinja\u0308rven ja Iso Kivija\u0308rven surviaissa\u0308a\u0308skiyhteiso\u0308ihin paleolimnologisen menetelma\u0308n avulla. Ja\u0308rvien sedimenttiprofiileita tarkasteltiin viimeisen 400 vuoden ajalta. Ja\u0308rvet ovat pienia\u0308, matalia humusja\u0308rvia\u0308 ja sijaitsevat Keski-Suomessa Keuruulla vierekka\u0308isilla\u0308 valuma-alueilla. Surviaissa\u0308a\u0308skiyhteiso\u0308jen muutosten perusteella tutkittiin ja\u0308rvien rehevyystason ja humoosisuuden muutoksia ennen ja ja\u0308lkeen metsa\u0308talouden ja turvetuotannon aloittamista. Soiden laajamittainen ojitus metsa\u0308talouden ka\u0308ytto\u0308o\u0308n alkoi 1960-luvulla molempien ja\u0308rvien valuma-alueilla. Martinja\u0308rven valuma-alueella aloitettiin lisa\u0308ksi turpeen kaivu 1970- ja 1980-lukujen vaihteessa. Turvetuotantoalueiden ja\u0308tevedet laskevat Martinja\u0308rven yla\u0308puolisiin vesisto\u0308ihin. Iso Kivija\u0308rvea\u0308 ka\u0308ytettiin Martinja\u0308rven vertailuja\u0308rvena\u0308 turvetuotannon osalta. Molempien ja\u0308rvien valuma-alueilla harjoitetaan myo\u0308s peltoviljelya\u0308. Surviaissa\u0308a\u0308skiyhteiso\u0308jen muutoksia tarkasteltiin pa\u0308a\u0308komponenttianalyysin (PCA), syva\u0308nnepohjaela\u0308inindeksin (Profundal Invertebrate Community Metrics) ja surviaissa\u0308skiyhteiso\u0308jen monimuotoisuuden perusteella. Sedimenttiprofiilien alkuaineanalyysin perusteella havaittiin mineraalimaa-ainesten eroosion voimakas kasvu 1960-luvulta la\u0308htien molempien ja\u0308rvien valuma-alueilla. Luonnontilassa molempien ja\u0308rvien surviaissa\u0308a\u0308skilajisto oli meso-eutrofisille ja\u0308rville tyypillista\u0308. 1960- ja 1970-lukujen ojitusten aikaan rehevyytta\u0308 ilmenta\u0308vien taksonien osuus kasvoi ja karumpien vesien taksonien osuus va\u0308heni molemmissa ja\u0308rvissa\u0308. Surviaissa\u0308a\u0308skija\u0308a\u0308nteiden perusteella ja\u0308rvien lieva\u0308 rehevo\u0308ityminen jatkui na\u0308ihin pa\u0308iviin saakka. Surviaissa\u0308a\u0308skiyhteiso\u0308jen muutos reheva\u0308mma\u0308n elinympa\u0308risto\u0308n lajistoksi oli Iso Kivija\u0308rvessa\u0308 hieman voimakkaampaa kuin Martinja\u0308rvessa\u0308, mika\u0308 voi osittain selittya\u0308 ja\u0308rvien erilaisilla hydrologis-morfologisilla ominaisuuksilla. Turvetuotannon alkuvaihetta lukuun ottamatta Martinja\u0308rven surviaissa\u0308a\u0308skiyhteiso\u0308issa\u0308 ei havaittu pelka\u0308sta\u0308a\u0308n turvetuotantoon yhdistetta\u0308vissa\u0308 olevia muutoksia. Martinja\u0308rven la\u0308hivaluma-alueen metsa\u0308taloustoimenpiteiden vaikutuksen ja\u0308rven surviaissa\u0308skiyhteiso\u0308ihin arvioitiin olleen kauempana sijaitsevien turvetuotantoalueiden ja peltojen vaikutusta merkitta\u0308va\u0308mpa\u0308a\u0308.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Sedimentary chironomid remains of Lake Martinja\u0308rvi and Lake Iso Kivija\u0308rvi in Central Finland were studied from sediment cores covering the last 400 years. Both lakes are small, shallow and highly dystrophic forest lakes. The major aim of the study was to assess the effects of intensive forestry activities and peat mining on ecosystems of the lakes. The changes in the lakes' trophic status and degree of humosity were studied by using sedimentary chironomid remains. Extensive ditching of bogs for forestry within the catchments of both lakes was started in the 1960s. Peat mining in the catchment of Martinja\u0308rvi was started in the 1980s. Run off water from peat mining sites drains first to lakes situated above Martinja\u0308rvi. Iso Kivija\u0308rvi was used as a reference lake to assess the effects of peat mining on chironomid assemblages of Martinja\u0308rvi. There are also agricultural lands in the catchment areas of both lakes. The changes in chironomid communities were analyzed using Principal Component Analysis (PCA), Profundal Invertebrate Community Metrics (PICM) and diversity indices. Increased erosion of mineral soil starting from the 1960s was detected in chemical stratigraphies of 33 elements analyzed from the sediment cores. In the natural state the chironomid communities of both lakes consisted of taxa typical of meso-eutrophic waters. Since the 1960s their communities indicated slight eutrophication which continued until recent. The change in the chironomid assemblages was greater in Iso Kivija\u0308rvi. Differences in hydromorphological properties of study lakes were partly responsible for the fact that environmental changes and effects of eutrophication remained smaller in Martinja\u0308rvi than in the reference lake. Change in chironomid communities of Martinja\u0308rvi in early 1980s could be partly related to peat mining. Otherwise the effects of peat mining on the chironomid communities could not be separated from the effects of forestry. As the land use adjacent to the shoreline of Martinja\u0308rvi consists almost exclusively of forestry, the effects of forestry practices on chironomid communities of Martinja\u0308rvi were assumed to be greater than the effects of peat mining sites and fields situated further away.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted using Plone Publishing form by Tiina Ahokas (tikairah) on 2015-05-24 10:31:43.616018. 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@noreply.fi) on 2015-05-24T10:31:44Z\r\nNo. of bitstreams: 2\r\nURN:NBN:fi:jyu-201505241970.pdf: 1553674 bytes, checksum: 117645ed4e7dad13d9169ac2fae93c12 (MD5)\r\nlicense.html: 4868 bytes, checksum: 557e472c3ef076730b5015c60b918e09 (MD5)", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2015-05-24T10:31:44Z (GMT). No. of bitstreams: 2\r\nURN:NBN:fi:jyu-201505241970.pdf: 1553674 bytes, checksum: 117645ed4e7dad13d9169ac2fae93c12 (MD5)\r\nlicense.html: 4868 bytes, checksum: 557e472c3ef076730b5015c60b918e09 (MD5)\r\n Previous issue date: 2015", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "1 verkkoaineisto (41 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": "Matala humusja\u0308rvi", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "rehevo\u0308ityminen", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "sedimentti", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "soiden ojitus", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "surviaissa\u0308a\u0308ski", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "valuma-alue", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "Catchment area", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "chironomids", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "ditching", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "eutrophication", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "sediment", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "shallow dystrophic lake", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Turve- ja mets\u00e4talouden vaikutukset kahden mets\u00e4j\u00e4rven surviaiss\u00e4\u00e4skiyhteis\u00f6ihin : paleolimnologinen tutkimus", "language": null, "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-201505241970", "language": null, "element": "identifier", "qualifier": "urn", "schema": "dc"}, {"key": "dc.type.ontasot", "value": 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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": "2015-05-24T10:31:44Z", "language": "", "element": "date", "qualifier": "updated", "schema": "dc"}, {"key": "yvv.contractresearch.collaborator", "value": "public", "language": "", "element": "contractresearch", "qualifier": "collaborator", "schema": "yvv"}, {"key": "yvv.contractresearch.funding", "value": "2800", "language": "", "element": "contractresearch", "qualifier": "funding", 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