Radiaalne juurdekasv keskealistes juuremädaniku nakkusega kuusikutes
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Kuupäev
2018
Kättesaadav alates
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Eesti Maaülikool
Abstrakt
Juuremädanikud on kuusikutes väga levinud ja on olulisimad majandusliku kahju tekitajad
Põhja-Euroopa metsades. Kuna juurepessu tõttu väheneb oluliselt kvaliteetse puidu maht
seepärast on väga tähtis, et me majandaksime kuusikuid õigesti. Käesolev uurimistöö on
valminud RMK projekti „Kuusikute raieaja ja raieviiside mõju patogeenide levikule ja
arvukusele ning puistu elurikkusele viljakates kasvukohatüüpides“ raames.
Bakalaureusetöö eesmärgiks on analüüsida harvendatud ja harvendamata 41–60 aasta
vanustes kuusikutes nakkusega ja tervete puude radiaalkasvu. Töös kasutati 2017. aastal
kogutud, 240 juurdekasvuproovi kahekümnelt alalt, millest mõõdeti 222 proovi. Kogutud
juurdekasvuproove mõõdeti Eesti Maaülikooli puiduteaduste laboris ning andmeanalüüs
viidi läbi programmis MS Excel.
Võetud 240 juurdekasvuproovist oli kahjustatud (esmanakkusega tumenenud ja
mädanikuga) proove 80 (33,3%). Analüüsides juurdekasvuseeriaid leiti, et harvendatud
puistutes on radiaalnejuurdekasv mädanikuga puudel statistiliselt oluliselt väiksem kui
tervetel puudel. Harvendatud puistutes kasvas mädanikuga puude aastarõngaste pindala
viimase 10 kasvuaasta jooksul 29% võrra vähem võrreldes tervete puudega.
Harvendamata puistus viimase 10 kasvuaasta jooksul mädanikuga puude aastarõngaste
pindala juurdekasv oli keskmiselt 39% väiksem võrreldes tervete puudega. Puude
diameetrite võrdlemisel selgus, et puu diameetri järgi pole võimalik eristada haigeid puid
tervetest puudest, sest need ei olnud üksteisest statistiliselt oluliselt erinevad. Analüüsitud
kusikutes leiti, et harvendamine ei ole otsene põhjus kahjustuse tekkimisele, sest
harvendatud alade (n = 15 ala) kahjustuse osakaal oli 31% ja harvendamata alade (n = 5
ala) kahjustuse osakaal oli 40%.
Root rot is very common pathogen, damaging Norway spruce stands and causing a great economic loss in Northern-Europe conifer forests. Because of decay in the tree trunk, the volumes of the quality timber can be considerably reduced, thus it is crucial to manage Norway spruce stands in an appropriate way. This research study is supported by the RMK project „ The impact of different cutting time and practices to pathogens distribution and biodiversity in spruce stands on fertile site types “. The aim of this bachelor work is to analyse and to compare the radial growth of healthy and infected by root rot Norway spruce trees, growing in mature thinned and not thinned stands. For this study, 240 tree increment cores from 20 sampling sites were collected in 2017. Tree-ring widths for 222 samples were measured, in the laboratory of wood sciences at the Estonian University of Life Sciences. The data analysis was carried out using MS Excel program. From the 240 increment samples 80 (33,3%) were damaged (discoloured and had rot signs). Analysis of radial increment series showed that in thinned stands radial growth of spruce trees with rot was statistically significantly smaller than for healthy trees. In thinned stands, during the last ten-year growth period spruce trees with rot had in average 29% lower annual ring-area increment compared to healthy trees. Whereas, in unthinned stands, annual ringarea increment over the last ten-year growth period was in average 39 % lower than in healthy trees. Comparison of tree diameters revealed, that it is not possible to distinguish root rot infected trees from healthy trees, because diameters are not statistically significantly different from each other. Based on the analysed spruce stands, it was found that thinning is not a direct cause for root rot damage, since proportion of damaged trees in studied stands was in average 31% and 40%, for thinned and unthinned sites, respectively.
Root rot is very common pathogen, damaging Norway spruce stands and causing a great economic loss in Northern-Europe conifer forests. Because of decay in the tree trunk, the volumes of the quality timber can be considerably reduced, thus it is crucial to manage Norway spruce stands in an appropriate way. This research study is supported by the RMK project „ The impact of different cutting time and practices to pathogens distribution and biodiversity in spruce stands on fertile site types “. The aim of this bachelor work is to analyse and to compare the radial growth of healthy and infected by root rot Norway spruce trees, growing in mature thinned and not thinned stands. For this study, 240 tree increment cores from 20 sampling sites were collected in 2017. Tree-ring widths for 222 samples were measured, in the laboratory of wood sciences at the Estonian University of Life Sciences. The data analysis was carried out using MS Excel program. From the 240 increment samples 80 (33,3%) were damaged (discoloured and had rot signs). Analysis of radial increment series showed that in thinned stands radial growth of spruce trees with rot was statistically significantly smaller than for healthy trees. In thinned stands, during the last ten-year growth period spruce trees with rot had in average 29% lower annual ring-area increment compared to healthy trees. Whereas, in unthinned stands, annual ringarea increment over the last ten-year growth period was in average 39 % lower than in healthy trees. Comparison of tree diameters revealed, that it is not possible to distinguish root rot infected trees from healthy trees, because diameters are not statistically significantly different from each other. Based on the analysed spruce stands, it was found that thinning is not a direct cause for root rot damage, since proportion of damaged trees in studied stands was in average 31% and 40%, for thinned and unthinned sites, respectively.
Kirjeldus
Bakalaureusetöö
Metsanduse õppekaval
Märksõnad
bakalaureusetööd, juuremädanik, harilik kuusk, radiaaljuurdekasv, aastarõngad, dendrokronoloogia