Varjatud juure- ja tüvemädaniku leviku uuringuala rajamine
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Kuupäev
2023
Kättesaadavus
05.09.2023
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Eesti Maaülikool
Abstrakt
Hemiboreaalses metsas langevad puud puistust välja enamasti konkurentsi, putukkahjustuse
või seennakkuse tõttu. Eestis on seennakkustele vastuvõtlikumad keskealised ja vanemad
ning endistele viljakatele põllumaadele rajatud hariliku kuuse (Picea abies L. Karst.) puistud.
Bakalaurusetöö peamiseks eesmärgiks oli rajada Lõuna-Eestisse varjatud juure- ja
tüvemädaniku leviku uuringuala. Esmase uurimisala loomisel võeti aluseks Eesti metsa
kasvukäigu püsiproovitükkide (KKPRT) võrgustik ning kogutud andmed annavad
võrgustikku juurde lisainformatsiooni. Pilootuuringuala käivitati esmalt 20 proovitükil,
edasiselt toimub järk-järguline uuringuala laiendamine. Proovitükkide valikukriteeriumiks
oli hariliku kuuse osakaal puistus. Proovitükid jagati kolme gruppi: a) 100-90% esimese rinde
koosseisust kuused, b) 89-75% esimese rinde koosseisust kuused, c) 74-50% esimese rinde
koosseisust kuused. Igal proovitükil valiti välja 10 puud, mida hinnati nii visuaalselt kui ka
PiCUS 3 helitomograafiga. Töö tulemusena kaardistati 20 proovitükil kokku 200 puu
tervislik seisukord, mis on aluseks mädaniku leviku dünaamika uurimiseks kordusmõõtmiste
kaudu. Ükski kuuse osakaalu grupp ei erinenud oluliselt üksteisest ning ei leitud erisusi
olenevalt puistu vanusest ega ka kasvukohatüübist. Töös kogutud andmete põhjal ei
täheldatud seost visuaalse hindamise ja helitomograafia hindamise tulemuste vahel. Visuaalse
hindamise käigus hinnati puud defektsemaks kui seda oli võimalik tuvastada tomograafi abil.
In hemiboreal forests, tree mortality primarily occurs due to competition and fungal infection. In Estonia, middle-aged and older Norway spruce (Picea abies L. Karst.) stands growing on former fertile farmlands are particularly vulnerable. The main objective of the bachelor's thesis was to establish a research area for the spread of hidden root and stem rot in Southern Estonia. The Estonian Network of Forest Research Plots (ENFRP) was used as the foundation for establishing the research area, and the acquired data serves as a valuable addition to the network. The pilot study area was started on 20 sample plots, and the study area will be gradually expanded. The selection criterion for the sample plots was based on the proportion of Norway spruce within the stand. The samples were categorized into three groups: a) spruce accounted for 100-90% of the first layer composition. b) spruce accounted for 89-75% of the first layer composition. c) spruce accounted for 74-50% of the first layer composition. On each sample plot, 10 trees were selected and evaluated both visually and with the PiCUS 3 Sonic tomograph. As a result of this study, the health condition of 200 trees was mapped across 20 sample plots, serving as a basis for investigating the dynamics of decay spread through repeated measurements. No significant differences were found among the spruce proportion groups, nor were any variations found based on stand age or site type. No significant correlation was observed between the results obtained from visual assessment and sound tomography evaluation. Notably, visual assessments tended to rate trees as more defective than the tomograph detected.
In hemiboreal forests, tree mortality primarily occurs due to competition and fungal infection. In Estonia, middle-aged and older Norway spruce (Picea abies L. Karst.) stands growing on former fertile farmlands are particularly vulnerable. The main objective of the bachelor's thesis was to establish a research area for the spread of hidden root and stem rot in Southern Estonia. The Estonian Network of Forest Research Plots (ENFRP) was used as the foundation for establishing the research area, and the acquired data serves as a valuable addition to the network. The pilot study area was started on 20 sample plots, and the study area will be gradually expanded. The selection criterion for the sample plots was based on the proportion of Norway spruce within the stand. The samples were categorized into three groups: a) spruce accounted for 100-90% of the first layer composition. b) spruce accounted for 89-75% of the first layer composition. c) spruce accounted for 74-50% of the first layer composition. On each sample plot, 10 trees were selected and evaluated both visually and with the PiCUS 3 Sonic tomograph. As a result of this study, the health condition of 200 trees was mapped across 20 sample plots, serving as a basis for investigating the dynamics of decay spread through repeated measurements. No significant differences were found among the spruce proportion groups, nor were any variations found based on stand age or site type. No significant correlation was observed between the results obtained from visual assessment and sound tomography evaluation. Notably, visual assessments tended to rate trees as more defective than the tomograph detected.
Kirjeldus
Bakalaureusetöö
Metsanduse õppekaval
Märksõnad
bakalaureusetööd, helitomograaf, PiCUS 3, harilik kuusk, KKPRT