Hariliku kuuse (Picea abies (L.) Karst.) radiaalkasvu analüüs juuremädaniku nakkusega küpsetes puistutes
Laen...
Kuupäev
2018
Kättesaadav alates
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Eesti Maaülikool
Abstrakt
Juuremädanikud põhjustavad kuuse puistutes majanduslikku kahju, rikkudes puidu
kvaliteeti ja vähendades puude juurdekasvu. Lisaks sellele on valede majandusviiside
korral suur tõenäosus, et patogeenid levivad peale raiet naaberpuudele või ka uude
metsapõlvkonda. Seetõttu on oluline leida seoseid metsade majandusvõtete ja
juuremädaniku leviku vahel.
Käesoleva bakalaureusetöö eesmärk oli uurida juuremädaniku mõju hariliku kuuse
radiaaljuurdekasvule. Selleks analüüsiti küpses eas kuusikuid, mis kasvasid juurepessu
nakkusele vastuvõtlikes, viljakates kasvukohatüüpides. Välitöödel koguti 240
puursüdamikku 20 proovialalt (12 alal oli eelnevalt tehtud harvendusraie ja 8 ala oli
harvendamata).
Analüüsiti kahjustuse osakaalu sõltuvust proovivõtu asukohast, kasvukohatüübist, puistu
vanusest ja puistu majandamisviisist. Lisaks uuriti puu diameetri erinevust vastavalt puu
tervislikule seisundile, s.o terved, esmase nakkusega ja mädanikuga puud. Analüüsiti ka
puude radiaalkasvu sõltuvust puude tervislikust seisundist ja puistu majandamise viisist.
Analüüsitud proovialade kuusikutest vanuses 66–86 olid keskmiselt 37% ulatuses haiged.
Analüüsist selgus, et uuritavatel proovialadel kahjustuse osakaal ei sõltunud proovide
kogumise asukohast (maakond), kasvukohatüübist, puistu vanusest ega puistu majandamise
viisist ehkantud juhul dispersioonanalüüsi tulemusel polnud tervete ja kahjustustega
kuuskede radiaalkasv statistiliselt olulist erinev, p>0,05. Harvendamata puistute tervete
puude aastarõnga pindala juurdekasv oli võrreldud gruppidest kõige suurem.
Root rot is causing economic losses in spruce stands, by reducing the wood quality and tree increment. In addition, due to inappropriate forest management activities, there is a high probability that after harvesting pathogens will spread into the neighbouring trees and even into next forest stand generations. Therefore, it is important to find relationships between the forest management practices and spread of root rot causing pathogens. The aim of this bachelor thesis was to investigate the impact of root rot damage on Norway spruce radial increment. For this purpose, it was analysed mature Norway spruce stands growing on fertile site types that are highly susceptible to infection by root rot. Altogether 240 increment cores were collected from 20 sampling sites (12 sites were previously thinned and 8 sites un thinned) for this study. The proportion of damage in the site was analysed in relation to sampling location (county), forest site type, stand age and stand management regime. In addition, relationship between tree size (diameter) and tree health status (healthy, recently infected and rotten) was investigated. Durning this research study the effects of tree health status and stand management regime on tree radial growth was studied. The average proportion of root rot damaged sample trees in the studied stands was 37%. The analysis revealed that the proportion of damaged sample trees in the studied sites did not depend on the sampling location (county), forest site type, stand age, nor on the stand management regime. Based on the results of analysis of variance there was no significant difference (p>0,05) between radial growth of healthy and root rot damaged spruce trees inthe age of 66–86 years. The average ring-area increment of healthy spruce trees, growing in unthinned stands was greatest among studied groups.
Root rot is causing economic losses in spruce stands, by reducing the wood quality and tree increment. In addition, due to inappropriate forest management activities, there is a high probability that after harvesting pathogens will spread into the neighbouring trees and even into next forest stand generations. Therefore, it is important to find relationships between the forest management practices and spread of root rot causing pathogens. The aim of this bachelor thesis was to investigate the impact of root rot damage on Norway spruce radial increment. For this purpose, it was analysed mature Norway spruce stands growing on fertile site types that are highly susceptible to infection by root rot. Altogether 240 increment cores were collected from 20 sampling sites (12 sites were previously thinned and 8 sites un thinned) for this study. The proportion of damage in the site was analysed in relation to sampling location (county), forest site type, stand age and stand management regime. In addition, relationship between tree size (diameter) and tree health status (healthy, recently infected and rotten) was investigated. Durning this research study the effects of tree health status and stand management regime on tree radial growth was studied. The average proportion of root rot damaged sample trees in the studied stands was 37%. The analysis revealed that the proportion of damaged sample trees in the studied sites did not depend on the sampling location (county), forest site type, stand age, nor on the stand management regime. Based on the results of analysis of variance there was no significant difference (p>0,05) between radial growth of healthy and root rot damaged spruce trees inthe age of 66–86 years. The average ring-area increment of healthy spruce trees, growing in unthinned stands was greatest among studied groups.
Kirjeldus
Bakalaureusetöö
Loodusvarade kasutamise ja kaitse õppekaval
Märksõnad
bakalaureusetööd, dendrokronoloogia, juuremädanik, aastarõngad, kasvukohatüübid