Hariliku saare (Fraxinus excelsior) tervislik seisund 20 aastat peale saaresurma tekitaja (Hymenoscyphus fraxineus) esmaleidu Eestis
Laen...
Kuupäev
2022
Kättesaadavus
07.09.2022
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Eesti Maaülikool
Abstrakt
Käesolev bakalaureusetöö uurib Hariliku saare (Fraxinus excelsior) vanade puude ja
järelkasvu taimede tervislikku seisundit Eestis. Hariliku saart on Eestis kahjustanud
saaresurma tekitaja Hymenoscyphus fraxineus juba 20 aastat. Tegu on uurimusega, mis
võrdleb 2021. aasta seireandmeid varasemate uurimustega, s.o. 2013. ja 2015. aasta
andmetega, et teada saada, kui palju on tervislik seisund saare puistutes ajas muutunud.
Välitööd teostati 2021. aasta augusti- ja septembrikuus Jõgeva-, Viljandi-, Pärnu- ja
Läänemaal olevatel lageraie ja vanametsa proovitükkidel. Hinnati saarte vanade puude
tervislikku seisundit ja loendati proovitükilt looduslikult uuenenud järelkasvutaimede
tervislikku seisundit vastavalt hindamisklassidele. Töö tulemustes selgub, et lageraie ja metsa
turbe all on sümptomaatiliste järelkasvu taimede osakaal muutunud 39% võrra väiksemaks
võrreldes 2015. aasta andmetega. Sümptomaatilisi taimi oli kogu taimede hulgast 2015. aastal
ja 2021. aastal vastavalt, 53 % ja 14 %. Tervete taimede osakaal sealjuures oli 2015. aastal
41% ja 2021. aastal 80%. Nii lageraie kui ka metsa turbe all kasvavate järelkasvupuude
tervislik seisund on muutunud oluliselt paremaks võrreldes varasemate seire andmetega.
Vanade puude tervislik seisund pole statistiliselt oluliselt muutunud. Edaspidi on plaanis
hinnata puude seisundit 2-3 aasta tagant, mis annab võimaluse jälgida saarte tervislikku
seisundi muutusi ajas.
This bachelor's thesis examines the health status of old trees and naturally regenerated young plants of European ash (Fraxinus excelsior) in Estonia. The European ash has been damaged in Estonia by the ash dieback pathogen Hymenoscyphus fraxineus over 20 years. This study compares monitoring data from 2021 with research done earlier in 2013 and 2015 to find out how much the health status of ash stands has changed over time. The fieldwork was carried out in August and September 2021 in clear-cut and old-growth forest plots in Jõgeva, Viljandi, Pärnu and Läänemaa counties. The health status of old ash trees was assessed and the naturally regenerated plants at each plot were counted according to health assessment classes. The results of the work show that the percentage of symptomatic plants on clear-cut and under old forest in 2021 has decreased 39 % compared to the 2015 data. In 2015 and 2021 was symptomatic plants of the total number of plants, 53% and 15%, respectively. The percentage of healthy plants was 41% in 2015 and 80% in 2021. The health status of young naturally regenerated plants has improved in both clear-cut areas and under forest shelter compared to previous monitoring data. The health status of old trees has not changed statistically significantly. In the future, it is planned to survey these plots after every 2-3 years. This gives valuable information about the health status of European ash in Estonian forests.
This bachelor's thesis examines the health status of old trees and naturally regenerated young plants of European ash (Fraxinus excelsior) in Estonia. The European ash has been damaged in Estonia by the ash dieback pathogen Hymenoscyphus fraxineus over 20 years. This study compares monitoring data from 2021 with research done earlier in 2013 and 2015 to find out how much the health status of ash stands has changed over time. The fieldwork was carried out in August and September 2021 in clear-cut and old-growth forest plots in Jõgeva, Viljandi, Pärnu and Läänemaa counties. The health status of old ash trees was assessed and the naturally regenerated plants at each plot were counted according to health assessment classes. The results of the work show that the percentage of symptomatic plants on clear-cut and under old forest in 2021 has decreased 39 % compared to the 2015 data. In 2015 and 2021 was symptomatic plants of the total number of plants, 53% and 15%, respectively. The percentage of healthy plants was 41% in 2015 and 80% in 2021. The health status of young naturally regenerated plants has improved in both clear-cut areas and under forest shelter compared to previous monitoring data. The health status of old trees has not changed statistically significantly. In the future, it is planned to survey these plots after every 2-3 years. This gives valuable information about the health status of European ash in Estonian forests.
Kirjeldus
Bakalaureusetöö
Metsanduse õppekaval
Märksõnad
bakalaureusetööd, looduslik uuendus, seirealad, haiguse seire, metsapatoloogia, vanad puud, invasiivsed seenpatogeenid