Kliima mõju hindamine kuuse-kooreüraski levikule: dendrokronoloogiline analüüs
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Kuupäev
2023
Kättesaadavus
07.09.2023
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Eesti Maaülikool
Abstrakt
Harilik kuusk (Picea abies (L.) Karst.) on Eesti metsanduses tähtis puuliik, olles
kogutagavaralt kolmas puuliik peale harilikku mändi (Pinus sylvestris L.) ja kaske (Betula
spp.), moodustades metsamaa pindalast 18,9% ja metsade tagavarast 19,6%. Üha
suurenevate kliima muutustega on harilik kuusk aga sattunud ohtu. Soojemad suved ja
talved põhjustavad kuuskede nõrgenemist ning on suurenenud kuuse-kooreüraski (Ips
typographus) kahjustuste suurenemise. Seetõttu on oluline leida seos kliima ning kuusekooreüraski vahel ning uurida, kuidas aeglustada üraskite levikut.
Käesoleva bakalaureusetöö eesmärgiks oli uurida, kuidas mõjutab kliima hariliku kuuse
radiaalkasvu ning kas on sellest tingituna erinevus üraski kahjustustega surnud puude ja
elusate puude vahel. Välitöödel koguti kolmelt alalt kokku 40 puursüdamikku.
Analüüsiti hariliku kuuse radiaalset juurdekasvu dendrokronoloogilisi meetodeid
kasutades ning võrreldi saadud tulemusi kliima andmetega. Analüüsidest selgus, et
väiksema radiaalse juurdekasvuga puud on tundlikumad kliima muutustele ning puud, mis
ei ole taastunud eelnevatest häiringutest, on suurema tõenäosusega kuuse-kooreüraski
nakatumise ohus.
Norway spruce (Picea abies (L.) Karst.) is an important tree species in Estonian forestry, being the third most important species after Scots pine (Pinus sylvestris L.) and birch (Betula spp.), accounting for 18.9% of the total forest area and 19.6% of the forest reserve. However, with increasing climate change, Norway spruce is under threat. Warmer summers and winters are leading to the weakening of spruce trees and there has been an increase in damage by spruce bark beetle (Ips typographus). It is therefore important to find the link between climate and spruce bark beetle and to investigate how to slow the spread of the beetle. The aim of this thesis was to investigate the effect of climate on the radial growth of Norway spruce, and whether there is a difference between dead trees and live trees with lesions. A total of 40 cuttings were collected from three sites during fieldwork. The radial increment of Norway spruce was analysed using dendrochronological methods and the results compared with climate data. The analyses showed that trees with lower radial increment are more sensitive to climate change and that trees that have not recovered from previous disturbances are more likely to be at risk of spruce bark beetle infestation.
Norway spruce (Picea abies (L.) Karst.) is an important tree species in Estonian forestry, being the third most important species after Scots pine (Pinus sylvestris L.) and birch (Betula spp.), accounting for 18.9% of the total forest area and 19.6% of the forest reserve. However, with increasing climate change, Norway spruce is under threat. Warmer summers and winters are leading to the weakening of spruce trees and there has been an increase in damage by spruce bark beetle (Ips typographus). It is therefore important to find the link between climate and spruce bark beetle and to investigate how to slow the spread of the beetle. The aim of this thesis was to investigate the effect of climate on the radial growth of Norway spruce, and whether there is a difference between dead trees and live trees with lesions. A total of 40 cuttings were collected from three sites during fieldwork. The radial increment of Norway spruce was analysed using dendrochronological methods and the results compared with climate data. The analyses showed that trees with lower radial increment are more sensitive to climate change and that trees that have not recovered from previous disturbances are more likely to be at risk of spruce bark beetle infestation.
Kirjeldus
Bakalaureusetöö
Metsanduse õppekaval
Märksõnad
bakalaureusetööd, harilik kuusk, kuuse-kooreürask, kliima, põud