Metsauuenduse kasvukiirus Järvselja turberaie katses
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Kuupäev
2023
Kättesaadavus
05.09.2023
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Eesti Maaülikool
Abstrakt
Bakalaureusetöö uurib metsauuenduse kasvukiirust erinevate turberaie (aegjärkne-,
häil- ja veerraie) meetodite ja taimetüüpide (istutatud paljasjuursed avamaa- ja
potitaimed ning looduslik (LU) ja inimese poolt tehtud külv) korral. Uurimus viidi
läbi 2012. aasta kevadel rajatud hariliku männi turberaie katsealal SA Järvselja
Õppe- ja Katsemetskonnas. Vana metsa täius pärast aegjärkse raie esimest raiejärku
oli 50%, mis viidi teise raiejärguga peale 9. kasvuaastat 20%-ni. Töö käigus mõõdeti
esimesest raiejärgust 11 aasta möödudes uuenduse puude kõrguskasv ja hinnati
säilivus. Lisaks hinnati veerraiel vana metsa servapuude juurkonkurentsi mõju
ulatust uuenduse puudele. Andmete töötlemiseks kasutati programme MS Excel ja
R Studio.
Töö tulemustest selgus, et pärast 11. aastat oli suurim kõrguskasv veerraie
männitaimedel ja madalaim aegjärkse raie taimedel. Parim tulemus taimede
säilivusel oli veerraie alal, kehveim häilraie alal. Kümne suurima männitaime
keskmise kõrguse võrdluses selgus, et kõikidel raiealadel on istutatud taimede
kasvukiirus kõrgem, kui külvi ja LU teel uuenenud taimedel. Veerraie alal selgus, et
vana metsa serva puude juurkonkurentsi mõju taimede kasvule on oluline esimese 7
meetri ulatuses. Edukaks metsa uuendamiseks männikutes aegjärkse raiega on
soovitav viia vana metsa täius esimese raiejärguga Metsaseaduses lubatud 30
protsendini. Turberaiete korral kiirendab täiendav istutus metsa edukat uuenemist.
This bachelor’s thesis examines the growth rate of forest regeneration under different methods of shelterwood system (shelterwood uniform system, group selection, shelterwood strip felling) on different regeneration (bare-rooted and containerised planted seedlings, natural regneration by seeds and artificial sowing). The study was carried out in the Järvselja training and experimental forest center of Scots Pine shelterwood experimental area. After the first logging stage in the shelterwood uniform system, the old forest density was 50%, which was reduced to 20% in the second logging stage after the 9th year of growth. In the course of the work, the height growth of regeneration trees was measured after 11 years and their survival was assessed. In addition, the effect of the old-growth forest edge on the regeneration growth was assessed in the strip felling shelterwood method. MS Excel and R Studio was used to analyze the data. The results of the work showed that after the 11th year, the highest growth was found in the plants of shelterwood strip felling and the lowest in the plants of shelterwood uniform system. The highest survival of the regeneration was in the shelterwood strip felling area, the lowest in shelterwood uniform system. In the shelterwood strip felling area, the effect of old-growth forest edge on regeneration growth was found to be significant within the 7 metres. In order to ensure succesful regneration of pine with the uniform shelterwood method, it is recommended to apply the Forest Act 30% remaining tree density.
This bachelor’s thesis examines the growth rate of forest regeneration under different methods of shelterwood system (shelterwood uniform system, group selection, shelterwood strip felling) on different regeneration (bare-rooted and containerised planted seedlings, natural regneration by seeds and artificial sowing). The study was carried out in the Järvselja training and experimental forest center of Scots Pine shelterwood experimental area. After the first logging stage in the shelterwood uniform system, the old forest density was 50%, which was reduced to 20% in the second logging stage after the 9th year of growth. In the course of the work, the height growth of regeneration trees was measured after 11 years and their survival was assessed. In addition, the effect of the old-growth forest edge on the regeneration growth was assessed in the strip felling shelterwood method. MS Excel and R Studio was used to analyze the data. The results of the work showed that after the 11th year, the highest growth was found in the plants of shelterwood strip felling and the lowest in the plants of shelterwood uniform system. The highest survival of the regeneration was in the shelterwood strip felling area, the lowest in shelterwood uniform system. In the shelterwood strip felling area, the effect of old-growth forest edge on regeneration growth was found to be significant within the 7 metres. In order to ensure succesful regneration of pine with the uniform shelterwood method, it is recommended to apply the Forest Act 30% remaining tree density.
Kirjeldus
Bakalaureusetöö
Metsanduse õppekaval
Märksõnad
bakalaureusetööd, turberaie, aegjärkne raie, häilraie, veerraie, harilik mänd